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/*! * Knockout JavaScript library v3.4.1 * (c) The Knockout.js team - http://knockoutjs.com/ * License: MIT (http://www.opensource.org/licenses/mit-license.php) */ (function(){ var DEBUG=true; (function(undefined){ // (0, eval)('this') is a robust way of getting a reference to the global object // For details, see http://stackoverflow.com/questions/14119988/return-this-0-evalthis/14120023#14120023 var window = this || (0, eval)('this'), document = window['document'], navigator = window['navigator'], jQueryInstance = window["jQuery"], JSON = window["JSON"]; (function(factory) { // Support three module loading scenarios if (typeof define === 'function' && define['amd']) { // [1] AMD anonymous module define(['exports', 'require'], factory); } else if (typeof exports === 'object' && typeof module === 'object') { // [2] CommonJS/Node.js factory(module['exports'] || exports); // module.exports is for Node.js } else { // [3] No module loader (plain <script> tag) - put directly in global namespace factory(window['ko'] = {}); } }(function(koExports, amdRequire){ // Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler). // In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable. var ko = typeof koExports !== 'undefined' ? koExports : {}; // Google Closure Compiler helpers (used only to make the minified file smaller) ko.exportSymbol = function(koPath, object) { var tokens = koPath.split("."); // In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable) // At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko) var target = ko; for (var i = 0; i < tokens.length - 1; i++) target = target[tokens[i]]; target[tokens[tokens.length - 1]] = object; }; ko.exportProperty = function(owner, publicName, object) { owner[publicName] = object; }; ko.version = "3.4.1"; ko.exportSymbol('version', ko.version); // For any options that may affect various areas of Knockout and aren't directly associated with data binding. ko.options = { 'deferUpdates': false, 'useOnlyNativeEvents': false }; //ko.exportSymbol('options', ko.options); // 'options' isn't minified ko.utils = (function () { function objectForEach(obj, action) { for (var prop in obj) { if (obj.hasOwnProperty(prop)) { action(prop, obj[prop]); } } } function extend(target, source) { if (source) { for(var prop in source) { if(source.hasOwnProperty(prop)) { target[prop] = source[prop]; } } } return target; } function setPrototypeOf(obj, proto) { obj.__proto__ = proto; return obj; } var canSetPrototype = ({ __proto__: [] } instanceof Array); var canUseSymbols = !DEBUG && typeof Symbol === 'function'; // Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup) var knownEvents = {}, knownEventTypesByEventName = {}; var keyEventTypeName = (navigator && /Firefox\/2/i.test(navigator.userAgent)) ? 'KeyboardEvent' : 'UIEvents'; knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress']; knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave']; objectForEach(knownEvents, function(eventType, knownEventsForType) { if (knownEventsForType.length) { for (var i = 0, j = knownEventsForType.length; i < j; i++) knownEventTypesByEventName[knownEventsForType[i]] = eventType; } }); var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406 // Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness) // Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10. // Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser. // If there is a future need to detect specific versions of IE10+, we will amend this. var ieVersion = document && (function() { var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i'); // Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment while ( div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->', iElems[0] ) {} return version > 4 ? version : undefined; }()); var isIe6 = ieVersion === 6, isIe7 = ieVersion === 7; function isClickOnCheckableElement(element, eventType) { if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false; if (eventType.toLowerCase() != "click") return false; var inputType = element.type; return (inputType == "checkbox") || (inputType == "radio"); } // For details on the pattern for changing node classes // see: https://github.com/knockout/knockout/issues/1597 var cssClassNameRegex = /\S+/g; function toggleDomNodeCssClass(node, classNames, shouldHaveClass) { var addOrRemoveFn; if (classNames) { if (typeof node.classList === 'object') { addOrRemoveFn = node.classList[shouldHaveClass ? 'add' : 'remove']; ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) { addOrRemoveFn.call(node.classList, className); }); } else if (typeof node.className['baseVal'] === 'string') { // SVG tag .classNames is an SVGAnimatedString instance toggleObjectClassPropertyString(node.className, 'baseVal', classNames, shouldHaveClass); } else { // node.className ought to be a string. toggleObjectClassPropertyString(node, 'className', classNames, shouldHaveClass); } } } function toggleObjectClassPropertyString(obj, prop, classNames, shouldHaveClass) { // obj/prop is either a node/'className' or a SVGAnimatedString/'baseVal'. var currentClassNames = obj[prop].match(cssClassNameRegex) || []; ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) { ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass); }); obj[prop] = currentClassNames.join(" "); } return { fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/], arrayForEach: function (array, action) { for (var i = 0, j = array.length; i < j; i++) action(array[i], i); }, arrayIndexOf: function (array, item) { if (typeof Array.prototype.indexOf == "function") return Array.prototype.indexOf.call(array, item); for (var i = 0, j = array.length; i < j; i++) if (array[i] === item) return i; return -1; }, arrayFirst: function (array, predicate, predicateOwner) { for (var i = 0, j = array.length; i < j; i++) if (predicate.call(predicateOwner, array[i], i)) return array[i]; return null; }, arrayRemoveItem: function (array, itemToRemove) { var index = ko.utils.arrayIndexOf(array, itemToRemove); if (index > 0) { array.splice(index, 1); } else if (index === 0) { array.shift(); } }, arrayGetDistinctValues: function (array) { array = array || []; var result = []; for (var i = 0, j = array.length; i < j; i++) { if (ko.utils.arrayIndexOf(result, array[i]) < 0) result.push(array[i]); } return result; }, arrayMap: function (array, mapping) { array = array || []; var result = []; for (var i = 0, j = array.length; i < j; i++) result.push(mapping(array[i], i)); return result; }, arrayFilter: function (array, predicate) { array = array || []; var result = []; for (var i = 0, j = array.length; i < j; i++) if (predicate(array[i], i)) result.push(array[i]); return result; }, arrayPushAll: function (array, valuesToPush) { if (valuesToPush instanceof Array) array.push.apply(array, valuesToPush); else for (var i = 0, j = valuesToPush.length; i < j; i++) array.push(valuesToPush[i]); return array; }, addOrRemoveItem: function(array, value, included) { var existingEntryIndex = ko.utils.arrayIndexOf(ko.utils.peekObservable(array), value); if (existingEntryIndex < 0) { if (included) array.push(value); } else { if (!included) array.splice(existingEntryIndex, 1); } }, canSetPrototype: canSetPrototype, extend: extend, setPrototypeOf: setPrototypeOf, setPrototypeOfOrExtend: canSetPrototype ? setPrototypeOf : extend, objectForEach: objectForEach, objectMap: function(source, mapping) { if (!source) return source; var target = {}; for (var prop in source) { if (source.hasOwnProperty(prop)) { target[prop] = mapping(source[prop], prop, source); } } return target; }, emptyDomNode: function (domNode) { while (domNode.firstChild) { ko.removeNode(domNode.firstChild); } }, moveCleanedNodesToContainerElement: function(nodes) { // Ensure it's a real array, as we're about to reparent the nodes and // we don't want the underlying collection to change while we're doing that. var nodesArray = ko.utils.makeArray(nodes); var templateDocument = (nodesArray[0] && nodesArray[0].ownerDocument) || document; var container = templateDocument.createElement('div'); for (var i = 0, j = nodesArray.length; i < j; i++) { container.appendChild(ko.cleanNode(nodesArray[i])); } return container; }, cloneNodes: function (nodesArray, shouldCleanNodes) { for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) { var clonedNode = nodesArray[i].cloneNode(true); newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode); } return newNodesArray; }, setDomNodeChildren: function (domNode, childNodes) { ko.utils.emptyDomNode(domNode); if (childNodes) { for (var i = 0, j = childNodes.length; i < j; i++) domNode.appendChild(childNodes[i]); } }, replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) { var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray; if (nodesToReplaceArray.length > 0) { var insertionPoint = nodesToReplaceArray[0]; var parent = insertionPoint.parentNode; for (var i = 0, j = newNodesArray.length; i < j; i++) parent.insertBefore(newNodesArray[i], insertionPoint); for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) { ko.removeNode(nodesToReplaceArray[i]); } } }, fixUpContinuousNodeArray: function(continuousNodeArray, parentNode) { // Before acting on a set of nodes that were previously outputted by a template function, we have to reconcile // them against what is in the DOM right now. It may be that some of the nodes have already been removed, or that // new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been // leading comment nodes (created by rewritten string-based templates) that have since been removed during binding. // So, this function translates the old "map" output array into its best guess of the set of current DOM nodes. // // Rules: // [A] Any leading nodes that have been removed should be ignored // These most likely correspond to memoization nodes that were already removed during binding // See https://github.com/knockout/knockout/pull/440 // [B] Any trailing nodes that have been remove should be ignored // This prevents the code here from adding unrelated nodes to the array while processing rule [C] // See https://github.com/knockout/knockout/pull/1903 // [C] We want to output a continuous series of nodes. So, ignore any nodes that have already been removed, // and include any nodes that have been inserted among the previous collection if (continuousNodeArray.length) { // The parent node can be a virtual element; so get the real parent node parentNode = (parentNode.nodeType === 8 && parentNode.parentNode) || parentNode; // Rule [A] while (continuousNodeArray.length && continuousNodeArray[0].parentNode !== parentNode) continuousNodeArray.splice(0, 1); // Rule [B] while (continuousNodeArray.length > 1 && continuousNodeArray[continuousNodeArray.length - 1].parentNode !== parentNode) continuousNodeArray.length--; // Rule [C] if (continuousNodeArray.length > 1) { var current = continuousNodeArray[0], last = continuousNodeArray[continuousNodeArray.length - 1]; // Replace with the actual new continuous node set continuousNodeArray.length = 0; while (current !== last) { continuousNodeArray.push(current); current = current.nextSibling; } continuousNodeArray.push(last); } } return continuousNodeArray; }, setOptionNodeSelectionState: function (optionNode, isSelected) { // IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser. if (ieVersion < 7) optionNode.setAttribute("selected", isSelected); else optionNode.selected = isSelected; }, stringTrim: function (string) { return string === null || string === undefined ? '' : string.trim ? string.trim() : string.toString().replace(/^[\s\xa0]+|[\s\xa0]+$/g, ''); }, stringStartsWith: function (string, startsWith) { string = string || ""; if (startsWith.length > string.length) return false; return string.substring(0, startsWith.length) === startsWith; }, domNodeIsContainedBy: function (node, containedByNode) { if (node === containedByNode) return true; if (node.nodeType === 11) return false; // Fixes issue #1162 - can't use node.contains for document fragments on IE8 if (containedByNode.contains) return containedByNode.contains(node.nodeType === 3 ? node.parentNode : node); if (containedByNode.compareDocumentPosition) return (containedByNode.compareDocumentPosition(node) & 16) == 16; while (node && node != containedByNode) { node = node.parentNode; } return !!node; }, domNodeIsAttachedToDocument: function (node) { return ko.utils.domNodeIsContainedBy(node, node.ownerDocument.documentElement); }, anyDomNodeIsAttachedToDocument: function(nodes) { return !!ko.utils.arrayFirst(nodes, ko.utils.domNodeIsAttachedToDocument); }, tagNameLower: function(element) { // For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case. // Possible future optimization: If we know it's an element from an XHTML document (not HTML), // we don't need to do the .toLowerCase() as it will always be lower case anyway. return element && element.tagName && element.tagName.toLowerCase(); }, catchFunctionErrors: function (delegate) { return ko['onError'] ? function () { try { return delegate.apply(this, arguments); } catch (e) { ko['onError'] && ko['onError'](e); throw e; } } : delegate; }, setTimeout: function (handler, timeout) { return setTimeout(ko.utils.catchFunctionErrors(handler), timeout); }, deferError: function (error) { setTimeout(function () { ko['onError'] && ko['onError'](error); throw error; }, 0); }, registerEventHandler: function (element, eventType, handler) { var wrappedHandler = ko.utils.catchFunctionErrors(handler); var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType]; if (!ko.options['useOnlyNativeEvents'] && !mustUseAttachEvent && jQueryInstance) { jQueryInstance(element)['bind'](eventType, wrappedHandler); } else if (!mustUseAttachEvent && typeof element.addEventListener == "function") element.addEventListener(eventType, wrappedHandler, false); else if (typeof element.attachEvent != "undefined") { var attachEventHandler = function (event) { wrappedHandler.call(element, event); }, attachEventName = "on" + eventType; element.attachEvent(attachEventName, attachEventHandler); // IE does not dispose attachEvent handlers automatically (unlike with addEventListener) // so to avoid leaks, we have to remove them manually. See bug #856 ko.utils.domNodeDisposal.addDisposeCallback(element, function() { element.detachEvent(attachEventName, attachEventHandler); }); } else throw new Error("Browser doesn't support addEventListener or attachEvent"); }, triggerEvent: function (element, eventType) { if (!(element && element.nodeType)) throw new Error("element must be a DOM node when calling triggerEvent"); // For click events on checkboxes and radio buttons, jQuery toggles the element checked state *after* the // event handler runs instead of *before*. (This was fixed in 1.9 for checkboxes but not for radio buttons.) // IE doesn't change the checked state when you trigger the click event using "fireEvent". // In both cases, we'll use the click method instead. var useClickWorkaround = isClickOnCheckableElement(element, eventType); if (!ko.options['useOnlyNativeEvents'] && jQueryInstance && !useClickWorkaround) { jQueryInstance(element)['trigger'](eventType); } else if (typeof document.createEvent == "function") { if (typeof element.dispatchEvent == "function") { var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents"; var event = document.createEvent(eventCategory); event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element); element.dispatchEvent(event); } else throw new Error("The supplied element doesn't support dispatchEvent"); } else if (useClickWorkaround && element.click) { element.click(); } else if (typeof element.fireEvent != "undefined") { element.fireEvent("on" + eventType); } else { throw new Error("Browser doesn't support triggering events"); } }, unwrapObservable: function (value) { return ko.isObservable(value) ? value() : value; }, peekObservable: function (value) { return ko.isObservable(value) ? value.peek() : value; }, toggleDomNodeCssClass: toggleDomNodeCssClass, setTextContent: function(element, textContent) { var value = ko.utils.unwrapObservable(textContent); if ((value === null) || (value === undefined)) value = ""; // We need there to be exactly one child: a text node. // If there are no children, more than one, or if it's not a text node, // we'll clear everything and create a single text node. var innerTextNode = ko.virtualElements.firstChild(element); if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) { ko.virtualElements.setDomNodeChildren(element, [element.ownerDocument.createTextNode(value)]); } else { innerTextNode.data = value; } ko.utils.forceRefresh(element); }, setElementName: function(element, name) { element.name = name; // Workaround IE 6/7 issue // - https://github.com/SteveSanderson/knockout/issues/197 // - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/ if (ieVersion <= 7) { try { element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false); } catch(e) {} // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View" } }, forceRefresh: function(node) { // Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209 if (ieVersion >= 9) { // For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container var elem = node.nodeType == 1 ? node : node.parentNode; if (elem.style) elem.style.zoom = elem.style.zoom; } }, ensureSelectElementIsRenderedCorrectly: function(selectElement) { // Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width. // (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option) // Also fixes IE7 and IE8 bug that causes selects to be zero width if enclosed by 'if' or 'with'. (See issue #839) if (ieVersion) { var originalWidth = selectElement.style.width; selectElement.style.width = 0; selectElement.style.width = originalWidth; } }, range: function (min, max) { min = ko.utils.unwrapObservable(min); max = ko.utils.unwrapObservable(max); var result = []; for (var i = min; i <= max; i++) result.push(i); return result; }, makeArray: function(arrayLikeObject) { var result = []; for (var i = 0, j = arrayLikeObject.length; i < j; i++) { result.push(arrayLikeObject[i]); }; return result; }, createSymbolOrString: function(identifier) { return canUseSymbols ? Symbol(identifier) : identifier; }, isIe6 : isIe6, isIe7 : isIe7, ieVersion : ieVersion, getFormFields: function(form, fieldName) { var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea"))); var isMatchingField = (typeof fieldName == 'string') ? function(field) { return field.name === fieldName } : function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate var matches = []; for (var i = fields.length - 1; i >= 0; i--) { if (isMatchingField(fields[i])) matches.push(fields[i]); }; return matches; }, parseJson: function (jsonString) { if (typeof jsonString == "string") { jsonString = ko.utils.stringTrim(jsonString); if (jsonString) { if (JSON && JSON.parse) // Use native parsing where available return JSON.parse(jsonString); return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers } } return null; }, stringifyJson: function (data, replacer, space) { // replacer and space are optional if (!JSON || !JSON.stringify) throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js"); return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space); }, postJson: function (urlOrForm, data, options) { options = options || {}; var params = options['params'] || {}; var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost; var url = urlOrForm; // If we were given a form, use its 'action' URL and pick out any requested field values if((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) { var originalForm = urlOrForm; url = originalForm.action; for (var i = includeFields.length - 1; i >= 0; i--) { var fields = ko.utils.getFormFields(originalForm, includeFields[i]); for (var j = fields.length - 1; j >= 0; j--) params[fields[j].name] = fields[j].value; } } data = ko.utils.unwrapObservable(data); var form = document.createElement("form"); form.style.display = "none"; form.action = url; form.method = "post"; for (var key in data) { // Since 'data' this is a model object, we include all properties including those inherited from its prototype var input = document.createElement("input"); input.type = "hidden"; input.name = key; input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key])); form.appendChild(input); } objectForEach(params, function(key, value) { var input = document.createElement("input"); input.type = "hidden"; input.name = key; input.value = value; form.appendChild(input); }); document.body.appendChild(form); options['submitter'] ? options['submitter'](form) : form.submit(); setTimeout(function () { form.parentNode.removeChild(form); }, 0); } } }()); ko.exportSymbol('utils', ko.utils); ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach); ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst); ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter); ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues); ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf); ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap); ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll); ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem); ko.exportSymbol('utils.extend', ko.utils.extend); ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost); ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields); ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable); ko.exportSymbol('utils.postJson', ko.utils.postJson); ko.exportSymbol('utils.parseJson', ko.utils.parseJson); ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler); ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson); ko.exportSymbol('utils.range', ko.utils.range); ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass); ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent); ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable); ko.exportSymbol('utils.objectForEach', ko.utils.objectForEach); ko.exportSymbol('utils.addOrRemoveItem', ko.utils.addOrRemoveItem); ko.exportSymbol('utils.setTextContent', ko.utils.setTextContent); ko.exportSymbol('unwrap', ko.utils.unwrapObservable); // Convenient shorthand, because this is used so commonly if (!Function.prototype['bind']) { // Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf) // In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js Function.prototype['bind'] = function (object) { var originalFunction = this; if (arguments.length === 1) { return function () { return originalFunction.apply(object, arguments); }; } else { var partialArgs = Array.prototype.slice.call(arguments, 1); return function () { var args = partialArgs.slice(0); args.push.apply(args, arguments); return originalFunction.apply(object, args); }; } }; } ko.utils.domData = new (function () { var uniqueId = 0; var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime(); var dataStore = {}; function getAll(node, createIfNotFound) { var dataStoreKey = node[dataStoreKeyExpandoPropertyName]; var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey]; if (!hasExistingDataStore) { if (!createIfNotFound) return undefined; dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++; dataStore[dataStoreKey] = {}; } return dataStore[dataStoreKey]; } return { get: function (node, key) { var allDataForNode = getAll(node, false); return allDataForNode === undefined ? undefined : allDataForNode[key]; }, set: function (node, key, value) { if (value === undefined) { // Make sure we don't actually create a new domData key if we are actually deleting a value if (getAll(node, false) === undefined) return; } var allDataForNode = getAll(node, true); allDataForNode[key] = value; }, clear: function (node) { var dataStoreKey = node[dataStoreKeyExpandoPropertyName]; if (dataStoreKey) { delete dataStore[dataStoreKey]; node[dataStoreKeyExpandoPropertyName] = null; return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended } return false; }, nextKey: function () { return (uniqueId++) + dataStoreKeyExpandoPropertyName; } }; })(); ko.exportSymbol('utils.domData', ko.utils.domData); ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully ko.utils.domNodeDisposal = new (function () { var domDataKey = ko.utils.domData.nextKey(); var cleanableNodeTypes = { 1: true, 8: true, 9: true }; // Element, Comment, Document var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document function getDisposeCallbacksCollection(node, createIfNotFound) { var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey); if ((allDisposeCallbacks === undefined) && createIfNotFound) { allDisposeCallbacks = []; ko.utils.domData.set(node, domDataKey, allDisposeCallbacks); } return allDisposeCallbacks; } function destroyCallbacksCollection(node) { ko.utils.domData.set(node, domDataKey, undefined); } function cleanSingleNode(node) { // Run all the dispose callbacks var callbacks = getDisposeCallbacksCollection(node, false); if (callbacks) { callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves) for (var i = 0; i < callbacks.length; i++) callbacks[i](node); } // Erase the DOM data ko.utils.domData.clear(node); // Perform cleanup needed by external libraries (currently only jQuery, but can be extended) ko.utils.domNodeDisposal["cleanExternalData"](node); // Clear any immediate-child comment nodes, as these wouldn't have been found by // node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements) if (cleanableNodeTypesWithDescendants[node.nodeType]) cleanImmediateCommentTypeChildren(node); } function cleanImmediateCommentTypeChildren(nodeWithChildren) { var child, nextChild = nodeWithChildren.firstChild; while (child = nextChild) { nextChild = child.nextSibling; if (child.nodeType === 8) cleanSingleNode(child); } } return { addDisposeCallback : function(node, callback) { if (typeof callback != "function") throw new Error("Callback must be a function"); getDisposeCallbacksCollection(node, true).push(callback); }, removeDisposeCallback : function(node, callback) { var callbacksCollection = getDisposeCallbacksCollection(node, false); if (callbacksCollection) { ko.utils.arrayRemoveItem(callbacksCollection, callback); if (callbacksCollection.length == 0) destroyCallbacksCollection(node); } }, cleanNode : function(node) { // First clean this node, where applicable if (cleanableNodeTypes[node.nodeType]) { cleanSingleNode(node); // ... then its descendants, where applicable if (cleanableNodeTypesWithDescendants[node.nodeType]) { // Clone the descendants list in case it changes during iteration var descendants = []; ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*")); for (var i = 0, j = descendants.length; i < j; i++) cleanSingleNode(descendants[i]); } } return node; }, removeNode : function(node) { ko.cleanNode(node); if (node.parentNode) node.parentNode.removeChild(node); }, "cleanExternalData" : function (node) { // Special support for jQuery here because it's so commonly used. // Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData // so notify it to tear down any resources associated with the node & descendants here. if (jQueryInstance && (typeof jQueryInstance['cleanData'] == "function")) jQueryInstance['cleanData']([node]); } }; })(); ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience ko.exportSymbol('cleanNode', ko.cleanNode); ko.exportSymbol('removeNode', ko.removeNode); ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal); ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback); ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback); (function () { var none = [0, "", ""], table = [1, "<table>", "</table>"], tbody = [2, "<table><tbody>", "</tbody></table>"], tr = [3, "<table><tbody><tr>", "</tr></tbody></table>"], select = [1, "<select multiple='multiple'>", "</select>"], lookup = { 'thead': table, 'tbody': table, 'tfoot': table, 'tr': tbody, 'td': tr, 'th': tr, 'option': select, 'optgroup': select }, // This is needed for old IE if you're *not* using either jQuery or innerShiv. Doesn't affect other cases. mayRequireCreateElementHack = ko.utils.ieVersion <= 8; function getWrap(tags) { var m = tags.match(/^<([a-z]+)[ >]/); return (m && lookup[m[1]]) || none; } function simpleHtmlParse(html, documentContext) { documentContext || (documentContext = document); var windowContext = documentContext['parentWindow'] || documentContext['defaultView'] || window; // Based on jQuery's "clean" function, but only accounting for table-related elements. // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of // a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>" // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present. // Trim whitespace, otherwise indexOf won't work as expected var tags = ko.utils.stringTrim(html).toLowerCase(), div = documentContext.createElement("div"), wrap = getWrap(tags), depth = wrap[0]; // Go to html and back, then peel off extra wrappers // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness. var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>"; if (typeof windowContext['innerShiv'] == "function") { // Note that innerShiv is deprecated in favour of html5shiv. We should consider adding // support for html5shiv (except if no explicit support is needed, e.g., if html5shiv // somehow shims the native APIs so it just works anyway) div.appendChild(windowContext['innerShiv'](markup)); } else { if (mayRequireCreateElementHack) { // The document.createElement('my-element') trick to enable custom elements in IE6-8 // only works if we assign innerHTML on an element associated with that document. documentContext.appendChild(div); } div.innerHTML = markup; if (mayRequireCreateElementHack) { div.parentNode.removeChild(div); } } // Move to the right depth while (depth--) div = div.lastChild; return ko.utils.makeArray(div.lastChild.childNodes); } function jQueryHtmlParse(html, documentContext) { // jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API. if (jQueryInstance['parseHTML']) { return jQueryInstance['parseHTML'](html, documentContext) || []; // Ensure we always return an array and never null } else { // For jQuery < 1.8.0, we fall back on the undocumented internal "clean" function. var elems = jQueryInstance['clean']([html], documentContext); // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment. // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time. // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment. if (elems && elems[0]) { // Find the top-most parent element that's a direct child of a document fragment var elem = elems[0]; while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */) elem = elem.parentNode; // ... then detach it if (elem.parentNode) elem.parentNode.removeChild(elem); } return elems; } } ko.utils.parseHtmlFragment = function(html, documentContext) { return jQueryInstance ? jQueryHtmlParse(html, documentContext) : // As below, benefit from jQuery's optimisations where possible simpleHtmlParse(html, documentContext); // ... otherwise, this simple logic will do in most common cases. }; ko.utils.setHtml = function(node, html) { ko.utils.emptyDomNode(node); // There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it html = ko.utils.unwrapObservable(html); if ((html !== null) && (html !== undefined)) { if (typeof html != 'string') html = html.toString(); // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments, // for example <tr> elements which are not normally allowed to exist on their own. // If you've referenced jQuery we'll use that rather than duplicating its code. if (jQueryInstance) { jQueryInstance(node)['html'](html); } else { // ... otherwise, use KO's own parsing logic. var parsedNodes = ko.utils.parseHtmlFragment(html, node.ownerDocument); for (var i = 0; i < parsedNodes.length; i++) node.appendChild(parsedNodes[i]); } } }; })(); ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment); ko.exportSymbol('utils.setHtml', ko.utils.setHtml); ko.memoization = (function () { var memos = {}; function randomMax8HexChars() { return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1); } function generateRandomId() { return randomMax8HexChars() + randomMax8HexChars(); } function findMemoNodes(rootNode, appendToArray) { if (!rootNode) return; if (rootNode.nodeType == 8) { var memoId = ko.memoization.parseMemoText(rootNode.nodeValue); if (memoId != null) appendToArray.push({ domNode: rootNode, memoId: memoId }); } else if (rootNode.nodeType == 1) { for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++) findMemoNodes(childNodes[i], appendToArray); } } return { memoize: function (callback) { if (typeof callback != "function") throw new Error("You can only pass a function to ko.memoization.memoize()"); var memoId = generateRandomId(); memos[memoId] = callback; return "<!--[ko_memo:" + memoId + "]-->"; }, unmemoize: function (memoId, callbackParams) { var callback = memos[memoId]; if (callback === undefined) throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized."); try { callback.apply(null, callbackParams || []); return true; } finally { delete memos[memoId]; } }, unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) { var memos = []; findMemoNodes(domNode, memos); for (var i = 0, j = memos.length; i < j; i++) { var node = memos[i].domNode; var combinedParams = [node]; if (extraCallbackParamsArray) ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray); ko.memoization.unmemoize(memos[i].memoId, combinedParams); node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again if (node.parentNode) node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again) } }, parseMemoText: function (memoText) { var match = memoText.match(/^\[ko_memo\:(.*?)\]$/); return match ? match[1] : null; } }; })(); ko.exportSymbol('memoization', ko.memoization); ko.exportSymbol('memoization.memoize', ko.memoization.memoize); ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize); ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText); ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants); ko.tasks = (function () { var scheduler, taskQueue = [], taskQueueLength = 0, nextHandle = 1, nextIndexToProcess = 0; if (window['MutationObserver']) { // Chrome 27+, Firefox 14+, IE 11+, Opera 15+, Safari 6.1+ // From https://github.com/petkaantonov/bluebird * Copyright (c) 2014 Petka Antonov * License: MIT scheduler = (function (callback) { var div = document.createElement("div"); new MutationObserver(callback).observe(div, {attributes: true}); return function () { div.classList.toggle("foo"); }; })(scheduledProcess); } else if (document && "onreadystatechange" in document.createElement("script")) { // IE 6-10 // From https://github.com/YuzuJS/setImmediate * Copyright (c) 2012 Barnesandnoble.com, llc, Donavon West, and Domenic Denicola * License: MIT scheduler = function (callback) { var script = document.createElement("script"); script.onreadystatechange = function () { script.onreadystatechange = null; document.documentElement.removeChild(script); script = null; callback(); }; document.documentElement.appendChild(script); }; } else { scheduler = function (callback) { setTimeout(callback, 0); }; } function processTasks() { if (taskQueueLength) { // Each mark represents the end of a logical group of tasks and the number of these groups is // limited to prevent unchecked recursion. var mark = taskQueueLength, countMarks = 0; // nextIndexToProcess keeps track of where we are in the queue; processTasks can be called recursively without issue for (var task; nextIndexToProcess < taskQueueLength; ) { if (task = taskQueue[nextIndexToProcess++]) { if (nextIndexToProcess > mark) { if (++countMarks >= 5000) { nextIndexToProcess = taskQueueLength; // skip all tasks remaining in the queue since any of them could be causing the recursion ko.utils.deferError(Error("'Too much recursion' after processing " + countMarks + " task groups.")); break; } mark = taskQueueLength; } try { task(); } catch (ex) { ko.utils.deferError(ex); } } } } } function scheduledProcess() { processTasks(); // Reset the queue nextIndexToProcess = taskQueueLength = taskQueue.length = 0; } function scheduleTaskProcessing() { ko.tasks['scheduler'](scheduledProcess); } var tasks = { 'scheduler': scheduler, // Allow overriding the scheduler schedule: function (func) { if (!taskQueueLength) { scheduleTaskProcessing(); } taskQueue[taskQueueLength++] = func; return nextHandle++; }, cancel: function (handle) { var index = handle - (nextHandle - taskQueueLength); if (index >= nextIndexToProcess && index < taskQueueLength) { taskQueue[index] = null; } }, // For testing only: reset the queue and return the previous queue length 'resetForTesting': function () { var length = taskQueueLength - nextIndexToProcess; nextIndexToProcess = taskQueueLength = taskQueue.length = 0; return length; }, runEarly: processTasks }; return tasks; })(); ko.exportSymbol('tasks', ko.tasks); ko.exportSymbol('tasks.schedule', ko.tasks.schedule); //ko.exportSymbol('tasks.cancel', ko.tasks.cancel); "cancel" isn't minified ko.exportSymbol('tasks.runEarly', ko.tasks.runEarly); ko.extenders = { 'throttle': function(target, timeout) { // Throttling means two things: // (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies // notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate target['throttleEvaluation'] = timeout; // (2) For writable targets (observables, or writable dependent observables), we throttle *writes* // so the target cannot change value synchronously or faster than a certain rate var writeTimeoutInstance = null; return ko.dependentObservable({ 'read': target, 'write': function(value) { clearTimeout(writeTimeoutInstance); writeTimeoutInstance = ko.utils.setTimeout(function() { target(value); }, timeout); } }); }, 'rateLimit': function(target, options) { var timeout, method, limitFunction; if (typeof options == 'number') { timeout = options; } else { timeout = options['timeout']; method = options['method']; } // rateLimit supersedes deferred updates target._deferUpdates = false; limitFunction = method == 'notifyWhenChangesStop' ? debounce : throttle; target.limit(function(callback) { return limitFunction(callback, timeout); }); }, 'deferred': function(target, options) { if (options !== true) { throw new Error('The \'deferred\' extender only accepts the value \'true\', because it is not supported to turn deferral off once enabled.') } if (!target._deferUpdates) { target._deferUpdates = true; target.limit(function (callback) { var handle; return function () { ko.tasks.cancel(handle); handle = ko.tasks.schedule(callback); target['notifySubscribers'](undefined, 'dirty'); }; }); } }, 'notify': function(target, notifyWhen) { target["equalityComparer"] = notifyWhen == "always" ? null : // null equalityComparer means to always notify valuesArePrimitiveAndEqual; } }; var primitiveTypes = { 'undefined':1, 'boolean':1, 'number':1, 'string':1 }; function valuesArePrimitiveAndEqual(a, b) { var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes); return oldValueIsPrimitive ? (a === b) : false; } function throttle(callback, timeout) { var timeoutInstance; return function () { if (!timeoutInstance) { timeoutInstance = ko.utils.setTimeout(function () { timeoutInstance = undefined; callback(); }, timeout); } }; } function debounce(callback, timeout) { var timeoutInstance; return function () { clearTimeout(timeoutInstance); timeoutInstance = ko.utils.setTimeout(callback, timeout); }; } function applyExtenders(requestedExtenders) { var target = this; if (requestedExtenders) { ko.utils.objectForEach(requestedExtenders, function(key, value) { var extenderHandler = ko.extenders[key]; if (typeof extenderHandler == 'function') { target = extenderHandler(target, value) || target; } }); } return target; } ko.exportSymbol('extenders', ko.extenders); ko.subscription = function (target, callback, disposeCallback) { this._target = target; this.callback = callback; this.disposeCallback = disposeCallback; this.isDisposed = false; ko.exportProperty(this, 'dispose', this.dispose); }; ko.subscription.prototype.dispose = function () { this.isDisposed = true; this.disposeCallback(); }; ko.subscribable = function () { ko.utils.setPrototypeOfOrExtend(this, ko_subscribable_fn); ko_subscribable_fn.init(this); } var defaultEvent = "change"; // Moved out of "limit" to avoid the extra closure function limitNotifySubscribers(value, event) { if (!event || event === defaultEvent) { this._limitChange(value); } else if (event === 'beforeChange') { this._limitBeforeChange(value); } else { this._origNotifySubscribers(value, event); } } var ko_subscribable_fn = { init: function(instance) { instance._subscriptions = {}; instance._versionNumber = 1; }, subscribe: function (callback, callbackTarget, event) { var self = this; event = event || defaultEvent; var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback; var subscription = new ko.subscription(self, boundCallback, function () { ko.utils.arrayRemoveItem(self._subscriptions[event], subscription); if (self.afterSubscriptionRemove) self.afterSubscriptionRemove(event); }); if (self.beforeSubscriptionAdd) self.beforeSubscriptionAdd(event); if (!self._subscriptions[event]) self._subscriptions[event] = []; self._subscriptions[event].push(subscription); return subscription; }, "notifySubscribers": function (valueToNotify, event) { event = event || defaultEvent; if (event === defaultEvent) { this.updateVersion(); } if (this.hasSubscriptionsForEvent(event)) { try { ko.dependencyDetection.begin(); // Begin suppressing dependency detection (by setting the top frame to undefined) for (var a = this._subscriptions[event].slice(0), i = 0, subscription; subscription = a[i]; ++i) { // In case a subscription was disposed during the arrayForEach cycle, check // for isDisposed on each subscription before invoking its callback if (!subscription.isDisposed) subscription.callback(valueToNotify); } } finally { ko.dependencyDetection.end(); // End suppressing dependency detection } } }, getVersion: function () { return this._versionNumber; }, hasChanged: function (versionToCheck) { return this.getVersion() !== versionToCheck; }, updateVersion: function () { ++this._versionNumber; }, limit: function(limitFunction) { var self = this, selfIsObservable = ko.isObservable(self), ignoreBeforeChange, previousValue, pendingValue, beforeChange = 'beforeChange'; if (!self._origNotifySubscribers) { self._origNotifySubscribers = self["notifySubscribers"]; self["notifySubscribers"] = limitNotifySubscribers; } var finish = limitFunction(function() { self._notificationIsPending = false; // If an observable provided a reference to itself, access it to get the latest value. // This allows computed observables to delay calculating their value until needed. if (selfIsObservable && pendingValue === self) { pendingValue = self(); } ignoreBeforeChange = false; if (self.isDifferent(previousValue, pendingValue)) { self._origNotifySubscribers(previousValue = pendingValue); } }); self._limitChange = function(value) { self._notificationIsPending = ignoreBeforeChange = true; pendingValue = value; finish(); }; self._limitBeforeChange = function(value) { if (!ignoreBeforeChange) { previousValue = value; self._origNotifySubscribers(value, beforeChange); } }; }, hasSubscriptionsForEvent: function(event) { return this._subscriptions[event] && this._subscriptions[event].length; }, getSubscriptionsCount: function (event) { if (event) { return this._subscriptions[event] && this._subscriptions[event].length || 0; } else { var total = 0; ko.utils.objectForEach(this._subscriptions, function(eventName, subscriptions) { if (eventName !== 'dirty') total += subscriptions.length; }); return total; } }, isDifferent: function(oldValue, newValue) { return !this['equalityComparer'] || !this['equalityComparer'](oldValue, newValue); }, extend: applyExtenders }; ko.exportProperty(ko_subscribable_fn, 'subscribe', ko_subscribable_fn.subscribe); ko.exportProperty(ko_subscribable_fn, 'extend', ko_subscribable_fn.extend); ko.exportProperty(ko_subscribable_fn, 'getSubscriptionsCount', ko_subscribable_fn.getSubscriptionsCount); // For browsers that support proto assignment, we overwrite the prototype of each // observable instance. Since observables are functions, we need Function.prototype // to still be in the prototype chain. if (ko.utils.canSetPrototype) { ko.utils.setPrototypeOf(ko_subscribable_fn, Function.prototype); } ko.subscribable['fn'] = ko_subscribable_fn; ko.isSubscribable = function (instance) { return instance != null && typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function"; }; ko.exportSymbol('subscribable', ko.subscribable); ko.exportSymbol('isSubscribable', ko.isSubscribable); ko.computedContext = ko.dependencyDetection = (function () { var outerFrames = [], currentFrame, lastId = 0; // Return a unique ID that can be assigned to an observable for dependency tracking. // Theoretically, you could eventually overflow the number storage size, resulting // in duplicate IDs. But in JavaScript, the largest exact integral value is 2^53 // or 9,007,199,254,740,992. If you created 1,000,000 IDs per second, it would // take over 285 years to reach that number. // Reference http://blog.vjeux.com/2010/javascript/javascript-max_int-number-limits.html function getId() { return ++lastId; } function begin(options) { outerFrames.push(currentFrame); currentFrame = options; } function end() { currentFrame = outerFrames.pop(); } return { begin: begin, end: end, registerDependency: function (subscribable) { if (currentFrame) { if (!ko.isSubscribable(subscribable)) throw new Error("Only subscribable things can act as dependencies"); currentFrame.callback.call(currentFrame.callbackTarget, subscribable, subscribable._id || (subscribable._id = getId())); } }, ignore: function (callback, callbackTarget, callbackArgs) { try { begin(); return callback.apply(callbackTarget, callbackArgs || []); } finally { end(); } }, getDependenciesCount: function () { if (currentFrame) return currentFrame.computed.getDependenciesCount(); }, isInitial: function() { if (currentFrame) return currentFrame.isInitial; } }; })(); ko.exportSymbol('computedContext', ko.computedContext); ko.exportSymbol('computedContext.getDependenciesCount', ko.computedContext.getDependenciesCount); ko.exportSymbol('computedContext.isInitial', ko.computedContext.isInitial); ko.exportSymbol('ignoreDependencies', ko.ignoreDependencies = ko.dependencyDetection.ignore); var observableLatestValue = ko.utils.createSymbolOrString('_latestValue'); ko.observable = function (initialValue) { function observable() { if (arguments.length > 0) { // Write // Ignore writes if the value hasn't changed if (observable.isDifferent(observable[observableLatestValue], arguments[0])) { observable.valueWillMutate(); observable[observableLatestValue] = arguments[0]; observable.valueHasMutated(); } return this; // Permits chained assignments } else { // Read ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation return observable[observableLatestValue]; } } observable[observableLatestValue] = initialValue; // Inherit from 'subscribable' if (!ko.utils.canSetPrototype) { // 'subscribable' won't be on the prototype chain unless we put it there directly ko.utils.extend(observable, ko.subscribable['fn']); } ko.subscribable['fn'].init(observable); // Inherit from 'observable' ko.utils.setPrototypeOfOrExtend(observable, observableFn); if (ko.options['deferUpdates']) { ko.extenders['deferred'](observable, true); } return observable; } // Define prototype for observables var observableFn = { 'equalityComparer': valuesArePrimitiveAndEqual, peek: function() { return this[observableLatestValue]; }, valueHasMutated: function () { this['notifySubscribers'](this[observableLatestValue]); }, valueWillMutate: function () { this['notifySubscribers'](this[observableLatestValue], 'beforeChange'); } }; // Note that for browsers that don't support proto assignment, the // inheritance chain is created manually in the ko.observable constructor if (ko.utils.canSetPrototype) { ko.utils.setPrototypeOf(observableFn, ko.subscribable['fn']); } var protoProperty = ko.observable.protoProperty = '__ko_proto__'; observableFn[protoProperty] = ko.observable; ko.hasPrototype = function(instance, prototype) { if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false; if (instance[protoProperty] === prototype) return true; return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain }; ko.isObservable = function (instance) { return ko.hasPrototype(instance, ko.observable); } ko.isWriteableObservable = function (instance) { // Observable if ((typeof instance == 'function') && instance[protoProperty] === ko.observable) return true; // Writeable dependent observable if ((typeof instance == 'function') && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction)) return true; // Anything else return false; } ko.exportSymbol('observable', ko.observable); ko.exportSymbol('isObservable', ko.isObservable); ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable); ko.exportSymbol('isWritableObservable', ko.isWriteableObservable); ko.exportSymbol('observable.fn', observableFn); ko.exportProperty(observableFn, 'peek', observableFn.peek); ko.exportProperty(observableFn, 'valueHasMutated', observableFn.valueHasMutated); ko.exportProperty(observableFn, 'valueWillMutate', observableFn.valueWillMutate); ko.observableArray = function (initialValues) { initialValues = initialValues || []; if (typeof initialValues != 'object' || !('length' in initialValues)) throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined."); var result = ko.observable(initialValues); ko.utils.setPrototypeOfOrExtend(result, ko.observableArray['fn']); return result.extend({'trackArrayChanges':true}); }; ko.observableArray['fn'] = { 'remove': function (valueOrPredicate) { var underlyingArray = this.peek(); var removedValues = []; var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; }; for (var i = 0; i < underlyingArray.length; i++) { var value = underlyingArray[i]; if (predicate(value)) { if (removedValues.length === 0) { this.valueWillMutate(); } removedValues.push(value); underlyingArray.splice(i, 1); i--; } } if (removedValues.length) { this.valueHasMutated(); } return removedValues; }, 'removeAll': function (arrayOfValues) { // If you passed zero args, we remove everything if (arrayOfValues === undefined) { var underlyingArray = this.peek(); var allValues = underlyingArray.slice(0); this.valueWillMutate(); underlyingArray.splice(0, underlyingArray.length); this.valueHasMutated(); return allValues; } // If you passed an arg, we interpret it as an array of entries to remove if (!arrayOfValues) return []; return this['remove'](function (value) { return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0; }); }, 'destroy': function (valueOrPredicate) { var underlyingArray = this.peek(); var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; }; this.valueWillMutate(); for (var i = underlyingArray.length - 1; i >= 0; i--) { var value = underlyingArray[i]; if (predicate(value)) underlyingArray[i]["_destroy"] = true; } this.valueHasMutated(); }, 'destroyAll': function (arrayOfValues) { // If you passed zero args, we destroy everything if (arrayOfValues === undefined) return this['destroy'](function() { return true }); // If you passed an arg, we interpret it as an array of entries to destroy if (!arrayOfValues) return []; return this['destroy'](function (value) { return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0; }); }, 'indexOf': function (item) { var underlyingArray = this(); return ko.utils.arrayIndexOf(underlyingArray, item); }, 'replace': function(oldItem, newItem) { var index = this['indexOf'](oldItem); if (index >= 0) { this.valueWillMutate(); this.peek()[index] = newItem; this.valueHasMutated(); } } }; // Note that for browsers that don't support proto assignment, the // inheritance chain is created manually in the ko.observableArray constructor if (ko.utils.canSetPrototype) { ko.utils.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']); } // Populate ko.observableArray.fn with read/write functions from native arrays // Important: Do not add any additional functions here that may reasonably be used to *read* data from the array // because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) { ko.observableArray['fn'][methodName] = function () { // Use "peek" to avoid creating a subscription in any computed that we're executing in the context of // (for consistency with mutating regular observables) var underlyingArray = this.peek(); this.valueWillMutate(); this.cacheDiffForKnownOperation(underlyingArray, methodName, arguments); var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments); this.valueHasMutated(); // The native sort and reverse methods return a reference to the array, but it makes more sense to return the observable array instead. return methodCallResult === underlyingArray ? this : methodCallResult; }; }); // Populate ko.observableArray.fn with read-only functions from native arrays ko.utils.arrayForEach(["slice"], function (methodName) { ko.observableArray['fn'][methodName] = function () { var underlyingArray = this(); return underlyingArray[methodName].apply(underlyingArray, arguments); }; }); ko.exportSymbol('observableArray', ko.observableArray); var arrayChangeEventName = 'arrayChange'; ko.extenders['trackArrayChanges'] = function(target, options) { // Use the provided options--each call to trackArrayChanges overwrites the previously set options target.compareArrayOptions = {}; if (options && typeof options == "object") { ko.utils.extend(target.compareArrayOptions, options); } target.compareArrayOptions['sparse'] = true; // Only modify the target observable once if (target.cacheDiffForKnownOperation) { return; } var trackingChanges = false, cachedDiff = null, arrayChangeSubscription, pendingNotifications = 0, underlyingNotifySubscribersFunction, underlyingBeforeSubscriptionAddFunction = target.beforeSubscriptionAdd, underlyingAfterSubscriptionRemoveFunction = target.afterSubscriptionRemove; // Watch "subscribe" calls, and for array change events, ensure change tracking is enabled target.beforeSubscriptionAdd = function (event) { if (underlyingBeforeSubscriptionAddFunction) underlyingBeforeSubscriptionAddFunction.call(target, event); if (event === arrayChangeEventName) { trackChanges(); } }; // Watch "dispose" calls, and for array change events, ensure change tracking is disabled when all are disposed target.afterSubscriptionRemove = function (event) { if (underlyingAfterSubscriptionRemoveFunction) underlyingAfterSubscriptionRemoveFunction.call(target, event); if (event === arrayChangeEventName && !target.hasSubscriptionsForEvent(arrayChangeEventName)) { if (underlyingNotifySubscribersFunction) { target['notifySubscribers'] = underlyingNotifySubscribersFunction; underlyingNotifySubscribersFunction = undefined; } arrayChangeSubscription.dispose(); trackingChanges = false; } }; function trackChanges() { // Calling 'trackChanges' multiple times is the same as calling it once if (trackingChanges) { return; } trackingChanges = true; // Intercept "notifySubscribers" to track how many times it was called. underlyingNotifySubscribersFunction = target['notifySubscribers']; target['notifySubscribers'] = function(valueToNotify, event) { if (!event || event === defaultEvent) { ++pendingNotifications; } return underlyingNotifySubscribersFunction.apply(this, arguments); }; // Each time the array changes value, capture a clone so that on the next // change it's possible to produce a diff var previousContents = [].concat(target.peek() || []); cachedDiff = null; arrayChangeSubscription = target.subscribe(function(currentContents) { // Make a copy of the current contents and ensure it's an array currentContents = [].concat(currentContents || []); // Compute the diff and issue notifications, but only if someone is listening if (target.hasSubscriptionsForEvent(arrayChangeEventName)) { var changes = getChanges(previousContents, currentContents); } // Eliminate references to the old, removed items, so they can be GCed previousContents = currentContents; cachedDiff = null; pendingNotifications = 0; if (changes && changes.length) { target['notifySubscribers'](changes, arrayChangeEventName); } }); } function getChanges(previousContents, currentContents) { // We try to re-use cached diffs. // The scenarios where pendingNotifications > 1 are when using rate-limiting or the Deferred Updates // plugin, which without this check would not be compatible with arrayChange notifications. Normally, // notifications are issued immediately so we wouldn't be queueing up more than one. if (!cachedDiff || pendingNotifications > 1) { cachedDiff = ko.utils.compareArrays(previousContents, currentContents, target.compareArrayOptions); } return cachedDiff; } target.cacheDiffForKnownOperation = function(rawArray, operationName, args) { // Only run if we're currently tracking changes for this observable array // and there aren't any pending deferred notifications. if (!trackingChanges || pendingNotifications) { return; } var diff = [], arrayLength = rawArray.length, argsLength = args.length, offset = 0; function pushDiff(status, value, index) { return diff[diff.length] = { 'status': status, 'value': value, 'index': index }; } switch (operationName) { case 'push': offset = arrayLength; case 'unshift': for (var index = 0; index < argsLength; index++) { pushDiff('added', args[index], offset + index); } break; case 'pop': offset = arrayLength - 1; case 'shift': if (arrayLength) { pushDiff('deleted', rawArray[offset], offset); } break; case 'splice': // Negative start index means 'from end of array'. After that we clamp to [0...arrayLength]. // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice var startIndex = Math.min(Math.max(0, args[0] < 0 ? arrayLength + args[0] : args[0]), arrayLength), endDeleteIndex = argsLength === 1 ? arrayLength : Math.min(startIndex + (args[1] || 0), arrayLength), endAddIndex = startIndex + argsLength - 2, endIndex = Math.max(endDeleteIndex, endAddIndex), additions = [], deletions = []; for (var index = startIndex, argsIndex = 2; index < endIndex; ++index, ++argsIndex) { if (index < endDeleteIndex) deletions.push(pushDiff('deleted', rawArray[index], index)); if (index < endAddIndex) additions.push(pushDiff('added', args[argsIndex], index)); } ko.utils.findMovesInArrayComparison(deletions, additions); break; default: return; } cachedDiff = diff; }; }; var computedState = ko.utils.createSymbolOrString('_state'); ko.computed = ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) { if (typeof evaluatorFunctionOrOptions === "object") { // Single-parameter syntax - everything is on this "options" param options = evaluatorFunctionOrOptions; } else { // Multi-parameter syntax - construct the options according to the params passed options = options || {}; if (evaluatorFunctionOrOptions) { options["read"] = evaluatorFunctionOrOptions; } } if (typeof options["read"] != "function") throw Error("Pass a function that returns the value of the ko.computed"); var writeFunction = options["write"]; var state = { latestValue: undefined, isStale: true, isBeingEvaluated: false, suppressDisposalUntilDisposeWhenReturnsFalse: false, isDisposed: false, pure: false, isSleeping: false, readFunction: options["read"], evaluatorFunctionTarget: evaluatorFunctionTarget || options["owner"], disposeWhenNodeIsRemoved: options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null, disposeWhen: options["disposeWhen"] || options.disposeWhen, domNodeDisposalCallback: null, dependencyTracking: {}, dependenciesCount: 0, evaluationTimeoutInstance: null }; function computedObservable() { if (arguments.length > 0) { if (typeof writeFunction === "function") { // Writing a value writeFunction.apply(state.evaluatorFunctionTarget, arguments); } else { throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters."); } return this; // Permits chained assignments } else { // Reading the value ko.dependencyDetection.registerDependency(computedObservable); if (state.isStale || (state.isSleeping && computedObservable.haveDependenciesChanged())) { computedObservable.evaluateImmediate(); } return state.latestValue; } } computedObservable[computedState] = state; computedObservable.hasWriteFunction = typeof writeFunction === "function"; // Inherit from 'subscribable' if (!ko.utils.canSetPrototype) { // 'subscribable' won't be on the prototype chain unless we put it there directly ko.utils.extend(computedObservable, ko.subscribable['fn']); } ko.subscribable['fn'].init(computedObservable); // Inherit from 'computed' ko.utils.setPrototypeOfOrExtend(computedObservable, computedFn); if (options['pure']) { state.pure = true; state.isSleeping = true; // Starts off sleeping; will awake on the first subscription ko.utils.extend(computedObservable, pureComputedOverrides); } else if (options['deferEvaluation']) { ko.utils.extend(computedObservable, deferEvaluationOverrides); } if (ko.options['deferUpdates']) { ko.extenders['deferred'](computedObservable, true); } if (DEBUG) { // #1731 - Aid debugging by exposing the computed's options computedObservable["_options"] = options; } if (state.disposeWhenNodeIsRemoved) { // Since this computed is associated with a DOM node, and we don't want to dispose the computed // until the DOM node is *removed* from the document (as opposed to never having been in the document), // we'll prevent disposal until "disposeWhen" first returns false. state.suppressDisposalUntilDisposeWhenReturnsFalse = true; // disposeWhenNodeIsRemoved: true can be used to opt into the "only dispose after first false result" // behaviour even if there's no specific node to watch. In that case, clear the option so we don't try // to watch for a non-node's disposal. This technique is intended for KO's internal use only and shouldn't // be documented or used by application code, as it's likely to change in a future version of KO. if (!state.disposeWhenNodeIsRemoved.nodeType) { state.disposeWhenNodeIsRemoved = null; } } // Evaluate, unless sleeping or deferEvaluation is true if (!state.isSleeping && !options['deferEvaluation']) { computedObservable.evaluateImmediate(); } // Attach a DOM node disposal callback so that the computed will be proactively disposed as soon as the node is // removed using ko.removeNode. But skip if isActive is false (there will never be any dependencies to dispose). if (state.disposeWhenNodeIsRemoved && computedObservable.isActive()) { ko.utils.domNodeDisposal.addDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback = function () { computedObservable.dispose(); }); } return computedObservable; }; // Utility function that disposes a given dependencyTracking entry function computedDisposeDependencyCallback(id, entryToDispose) { if (entryToDispose !== null && entryToDispose.dispose) { entryToDispose.dispose(); } } // This function gets called each time a dependency is detected while evaluating a computed. // It's factored out as a shared function to avoid creating unnecessary function instances during evaluation. function computedBeginDependencyDetectionCallback(subscribable, id) { var computedObservable = this.computedObservable, state = computedObservable[computedState]; if (!state.isDisposed) { if (this.disposalCount && this.disposalCandidates[id]) { // Don't want to dispose this subscription, as it's still being used computedObservable.addDependencyTracking(id, subscribable, this.disposalCandidates[id]); this.disposalCandidates[id] = null; // No need to actually delete the property - disposalCandidates is a transient object anyway --this.disposalCount; } else if (!state.dependencyTracking[id]) { // Brand new subscription - add it computedObservable.addDependencyTracking(id, subscribable, state.isSleeping ? { _target: subscribable } : computedObservable.subscribeToDependency(subscribable)); } } } var computedFn = { "equalityComparer": valuesArePrimitiveAndEqual, getDependenciesCount: function () { return this[computedState].dependenciesCount; }, addDependencyTracking: function (id, target, trackingObj) { if (this[computedState].pure && target === this) { throw Error("A 'pure' computed must not be called recursively"); } this[computedState].dependencyTracking[id] = trackingObj; trackingObj._order = this[computedState].dependenciesCount++; trackingObj._version = target.getVersion(); }, haveDependenciesChanged: function () { var id, dependency, dependencyTracking = this[computedState].dependencyTracking; for (id in dependencyTracking) { if (dependencyTracking.hasOwnProperty(id)) { dependency = dependencyTracking[id]; if (dependency._target.hasChanged(dependency._version)) { return true; } } } }, markDirty: function () { // Process "dirty" events if we can handle delayed notifications if (this._evalDelayed && !this[computedState].isBeingEvaluated) { this._evalDelayed(); } }, isActive: function () { return this[computedState].isStale || this[computedState].dependenciesCount > 0; }, respondToChange: function () { // Ignore "change" events if we've already scheduled a delayed notification if (!this._notificationIsPending) { this.evaluatePossiblyAsync(); } }, subscribeToDependency: function (target) { if (target._deferUpdates && !this[computedState].disposeWhenNodeIsRemoved) { var dirtySub = target.subscribe(this.markDirty, this, 'dirty'), changeSub = target.subscribe(this.respondToChange, this); return { _target: target, dispose: function () { dirtySub.dispose(); changeSub.dispose(); } }; } else { return target.subscribe(this.evaluatePossiblyAsync, this); } }, evaluatePossiblyAsync: function () { var computedObservable = this, throttleEvaluationTimeout = computedObservable['throttleEvaluation']; if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) { clearTimeout(this[computedState].evaluationTimeoutInstance); this[computedState].evaluationTimeoutInstance = ko.utils.setTimeout(function () { computedObservable.evaluateImmediate(true /*notifyChange*/); }, throttleEvaluationTimeout); } else if (computedObservable._evalDelayed) { computedObservable._evalDelayed(); } else { computedObservable.evaluateImmediate(true /*notifyChange*/); } }, evaluateImmediate: function (notifyChange) { var computedObservable = this, state = computedObservable[computedState], disposeWhen = state.disposeWhen, changed = false; if (state.isBeingEvaluated) { // If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation. // This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost // certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing // their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387 return; } // Do not evaluate (and possibly capture new dependencies) if disposed if (state.isDisposed) { return; } if (state.disposeWhenNodeIsRemoved && !ko.utils.domNodeIsAttachedToDocument(state.disposeWhenNodeIsRemoved) || disposeWhen && disposeWhen()) { // See comment above about suppressDisposalUntilDisposeWhenReturnsFalse if (!state.suppressDisposalUntilDisposeWhenReturnsFalse) { computedObservable.dispose(); return; } } else { // It just did return false, so we can stop suppressing now state.suppressDisposalUntilDisposeWhenReturnsFalse = false; } state.isBeingEvaluated = true; try { changed = this.evaluateImmediate_CallReadWithDependencyDetection(notifyChange); } finally { state.isBeingEvaluated = false; } if (!state.dependenciesCount) { computedObservable.dispose(); } return changed; }, evaluateImmediate_CallReadWithDependencyDetection: function (notifyChange) { // This function is really just part of the evaluateImmediate logic. You would never call it from anywhere else. // Factoring it out into a separate function means it can be independent of the try/catch block in evaluateImmediate, // which contributes to saving about 40% off the CPU overhead of computed evaluation (on V8 at least). var computedObservable = this, state = computedObservable[computedState], changed = false; // Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal). // Then, during evaluation, we cross off any that are in fact still being used. var isInitial = state.pure ? undefined : !state.dependenciesCount, // If we're evaluating when there are no previous dependencies, it must be the first time dependencyDetectionContext = { computedObservable: computedObservable, disposalCandidates: state.dependencyTracking, disposalCount: state.dependenciesCount }; ko.dependencyDetection.begin({ callbackTarget: dependencyDetectionContext, callback: computedBeginDependencyDetectionCallback, computed: computedObservable, isInitial: isInitial }); state.dependencyTracking = {}; state.dependenciesCount = 0; var newValue = this.evaluateImmediate_CallReadThenEndDependencyDetection(state, dependencyDetectionContext); if (computedObservable.isDifferent(state.latestValue, newValue)) { if (!state.isSleeping) { computedObservable["notifySubscribers"](state.latestValue, "beforeChange"); } state.latestValue = newValue; if (DEBUG) computedObservable._latestValue = newValue; if (state.isSleeping) { computedObservable.updateVersion(); } else if (notifyChange) { computedObservable["notifySubscribers"](state.latestValue); } changed = true; } if (isInitial) { computedObservable["notifySubscribers"](state.latestValue, "awake"); } return changed; }, evaluateImmediate_CallReadThenEndDependencyDetection: function (state, dependencyDetectionContext) { // This function is really part of the evaluateImmediate_CallReadWithDependencyDetection logic. // You'd never call it from anywhere else. Factoring it out means that evaluateImmediate_CallReadWithDependencyDetection // can be independent of try/finally blocks, which contributes to saving about 40% off the CPU // overhead of computed evaluation (on V8 at least). try { var readFunction = state.readFunction; return state.evaluatorFunctionTarget ? readFunction.call(state.evaluatorFunctionTarget) : readFunction(); } finally { ko.dependencyDetection.end(); // For each subscription no longer being used, remove it from the active subscriptions list and dispose it if (dependencyDetectionContext.disposalCount && !state.isSleeping) { ko.utils.objectForEach(dependencyDetectionContext.disposalCandidates, computedDisposeDependencyCallback); } state.isStale = false; } }, peek: function () { // Peek won't re-evaluate, except while the computed is sleeping or to get the initial value when "deferEvaluation" is set. var state = this[computedState]; if ((state.isStale && !state.dependenciesCount) || (state.isSleeping && this.haveDependenciesChanged())) { this.evaluateImmediate(); } return state.latestValue; }, limit: function (limitFunction) { // Override the limit function with one that delays evaluation as well ko.subscribable['fn'].limit.call(this, limitFunction); this._evalDelayed = function () { this._limitBeforeChange(this[computedState].latestValue); this[computedState].isStale = true; // Mark as dirty // Pass the observable to the "limit" code, which will access it when // it's time to do the notification. this._limitChange(this); } }, dispose: function () { var state = this[computedState]; if (!state.isSleeping && state.dependencyTracking) { ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) { if (dependency.dispose) dependency.dispose(); }); } if (state.disposeWhenNodeIsRemoved && state.domNodeDisposalCallback) { ko.utils.domNodeDisposal.removeDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback); } state.dependencyTracking = null; state.dependenciesCount = 0; state.isDisposed = true; state.isStale = false; state.isSleeping = false; state.disposeWhenNodeIsRemoved = null; } }; var pureComputedOverrides = { beforeSubscriptionAdd: function (event) { // If asleep, wake up the computed by subscribing to any dependencies. var computedObservable = this, state = computedObservable[computedState]; if (!state.isDisposed && state.isSleeping && event == 'change') { state.isSleeping = false; if (state.isStale || computedObservable.haveDependenciesChanged()) { state.dependencyTracking = null; state.dependenciesCount = 0; state.isStale = true; if (computedObservable.evaluateImmediate()) { computedObservable.updateVersion(); } } else { // First put the dependencies in order var dependeciesOrder = []; ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) { dependeciesOrder[dependency._order] = id; }); // Next, subscribe to each one ko.utils.arrayForEach(dependeciesOrder, function (id, order) { var dependency = state.dependencyTracking[id], subscription = computedObservable.subscribeToDependency(dependency._target); subscription._order = order; subscription._version = dependency._version; state.dependencyTracking[id] = subscription; }); } if (!state.isDisposed) { // test since evaluating could trigger disposal computedObservable["notifySubscribers"](state.latestValue, "awake"); } } }, afterSubscriptionRemove: function (event) { var state = this[computedState]; if (!state.isDisposed && event == 'change' && !this.hasSubscriptionsForEvent('change')) { ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) { if (dependency.dispose) { state.dependencyTracking[id] = { _target: dependency._target, _order: dependency._order, _version: dependency._version }; dependency.dispose(); } }); state.isSleeping = true; this["notifySubscribers"](undefined, "asleep"); } }, getVersion: function () { // Because a pure computed is not automatically updated while it is sleeping, we can't // simply return the version number. Instead, we check if any of the dependencies have // changed and conditionally re-evaluate the computed observable. var state = this[computedState]; if (state.isSleeping && (state.isStale || this.haveDependenciesChanged())) { this.evaluateImmediate(); } return ko.subscribable['fn'].getVersion.call(this); } }; var deferEvaluationOverrides = { beforeSubscriptionAdd: function (event) { // This will force a computed with deferEvaluation to evaluate when the first subscription is registered. if (event == 'change' || event == 'beforeChange') { this.peek(); } } }; // Note that for browsers that don't support proto assignment, the // inheritance chain is created manually in the ko.computed constructor if (ko.utils.canSetPrototype) { ko.utils.setPrototypeOf(computedFn, ko.subscribable['fn']); } // Set the proto chain values for ko.hasPrototype var protoProp = ko.observable.protoProperty; // == "__ko_proto__" ko.computed[protoProp] = ko.observable; computedFn[protoProp] = ko.computed; ko.isComputed = function (instance) { return ko.hasPrototype(instance, ko.computed); }; ko.isPureComputed = function (instance) { return ko.hasPrototype(instance, ko.computed) && instance[computedState] && instance[computedState].pure; }; ko.exportSymbol('computed', ko.computed); ko.exportSymbol('dependentObservable', ko.computed); // export ko.dependentObservable for backwards compatibility (1.x) ko.exportSymbol('isComputed', ko.isComputed); ko.exportSymbol('isPureComputed', ko.isPureComputed); ko.exportSymbol('computed.fn', computedFn); ko.exportProperty(computedFn, 'peek', computedFn.peek); ko.exportProperty(computedFn, 'dispose', computedFn.dispose); ko.exportProperty(computedFn, 'isActive', computedFn.isActive); ko.exportProperty(computedFn, 'getDependenciesCount', computedFn.getDependenciesCount); ko.pureComputed = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget) { if (typeof evaluatorFunctionOrOptions === 'function') { return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget, {'pure':true}); } else { evaluatorFunctionOrOptions = ko.utils.extend({}, evaluatorFunctionOrOptions); // make a copy of the parameter object evaluatorFunctionOrOptions['pure'] = true; return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget); } } ko.exportSymbol('pureComputed', ko.pureComputed); (function() { var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle) ko.toJS = function(rootObject) { if (arguments.length == 0) throw new Error("When calling ko.toJS, pass the object you want to convert."); // We just unwrap everything at every level in the object graph return mapJsObjectGraph(rootObject, function(valueToMap) { // Loop because an observable's value might in turn be another observable wrapper for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++) valueToMap = valueToMap(); return valueToMap; }); }; ko.toJSON = function(rootObject, replacer, space) { // replacer and space are optional var plainJavaScriptObject = ko.toJS(rootObject); return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space); }; function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) { visitedObjects = visitedObjects || new objectLookup(); rootObject = mapInputCallback(rootObject); var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof RegExp)) && (!(rootObject instanceof Date)) && (!(rootObject instanceof String)) && (!(rootObject instanceof Number)) && (!(rootObject instanceof Boolean)); if (!canHaveProperties) return rootObject; var outputProperties = rootObject instanceof Array ? [] : {}; visitedObjects.save(rootObject, outputProperties); visitPropertiesOrArrayEntries(rootObject, function(indexer) { var propertyValue = mapInputCallback(rootObject[indexer]); switch (typeof propertyValue) { case "boolean": case "number": case "string": case "function": outputProperties[indexer] = propertyValue; break; case "object": case "undefined": var previouslyMappedValue = visitedObjects.get(propertyValue); outputProperties[indexer] = (previouslyMappedValue !== undefined) ? previouslyMappedValue : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects); break; } }); return outputProperties; } function visitPropertiesOrArrayEntries(rootObject, visitorCallback) { if (rootObject instanceof Array) { for (var i = 0; i < rootObject.length; i++) visitorCallback(i); // For arrays, also respect toJSON property for custom mappings (fixes #278) if (typeof rootObject['toJSON'] == 'function') visitorCallback('toJSON'); } else { for (var propertyName in rootObject) { visitorCallback(propertyName); } } }; function objectLookup() { this.keys = []; this.values = []; }; objectLookup.prototype = { constructor: objectLookup, save: function(key, value) { var existingIndex = ko.utils.arrayIndexOf(this.keys, key); if (existingIndex >= 0) this.values[existingIndex] = value; else { this.keys.push(key); this.values.push(value); } }, get: function(key) { var existingIndex = ko.utils.arrayIndexOf(this.keys, key); return (existingIndex >= 0) ? this.values[existingIndex] : undefined; } }; })(); ko.exportSymbol('toJS', ko.toJS); ko.exportSymbol('toJSON', ko.toJSON); (function () { var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__'; // Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values // are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values // that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns. ko.selectExtensions = { readValue : function(element) { switch (ko.utils.tagNameLower(element)) { case 'option': if (element[hasDomDataExpandoProperty] === true) return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey); return ko.utils.ieVersion <= 7 ? (element.getAttributeNode('value') && element.getAttributeNode('value').specified ? element.value : element.text) : element.value; case 'select': return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined; default: return element.value; } }, writeValue: function(element, value, allowUnset) { switch (ko.utils.tagNameLower(element)) { case 'option': switch(typeof value) { case "string": ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined); if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node delete element[hasDomDataExpandoProperty]; } element.value = value; break; default: // Store arbitrary object using DomData ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value); element[hasDomDataExpandoProperty] = true; // Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value. element.value = typeof value === "number" ? value : ""; break; } break; case 'select': if (value === "" || value === null) // A blank string or null value will select the caption value = undefined; var selection = -1; for (var i = 0, n = element.options.length, optionValue; i < n; ++i) { optionValue = ko.selectExtensions.readValue(element.options[i]); // Include special check to handle selecting a caption with a blank string value if (optionValue == value || (optionValue == "" && value === undefined)) { selection = i; break; } } if (allowUnset || selection >= 0 || (value === undefined && element.size > 1)) { element.selectedIndex = selection; } break; default: if ((value === null) || (value === undefined)) value = ""; element.value = value; break; } } }; })(); ko.exportSymbol('selectExtensions', ko.selectExtensions); ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue); ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue); ko.expressionRewriting = (function () { var javaScriptReservedWords = ["true", "false", "null", "undefined"]; // Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor // This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c). // This also will not properly handle nested brackets (e.g., obj1[obj2['prop']]; see #911). var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i; function getWriteableValue(expression) { if (ko.utils.arrayIndexOf(javaScriptReservedWords, expression) >= 0) return false; var match = expression.match(javaScriptAssignmentTarget); return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression; } // The following regular expressions will be used to split an object-literal string into tokens // These two match strings, either with double quotes or single quotes var stringDouble = '"(?:[^"\\\\]|\\\\.)*"', stringSingle = "'(?:[^'\\\\]|\\\\.)*'", // Matches a regular expression (text enclosed by slashes), but will also match sets of divisions // as a regular expression (this is handled by the parsing loop below). stringRegexp = '/(?:[^/\\\\]|\\\\.)*/\w*', // These characters have special meaning to the parser and must not appear in the middle of a // token, except as part of a string. specials = ',"\'{}()/:[\\]', // Match text (at least two characters) that does not contain any of the above special characters, // although some of the special characters are allowed to start it (all but the colon and comma). // The text can contain spaces, but leading or trailing spaces are skipped. everyThingElse = '[^\\s:,/][^' + specials + ']*[^\\s' + specials + ']', // Match any non-space character not matched already. This will match colons and commas, since they're // not matched by "everyThingElse", but will also match any other single character that wasn't already // matched (for example: in "a: 1, b: 2", each of the non-space characters will be matched by oneNotSpace). oneNotSpace = '[^\\s]', // Create the actual regular expression by or-ing the above strings. The order is important. bindingToken = RegExp(stringDouble + '|' + stringSingle + '|' + stringRegexp + '|' + everyThingElse + '|' + oneNotSpace, 'g'), // Match end of previous token to determine whether a slash is a division or regex. divisionLookBehind = /[\])"'A-Za-z0-9_$]+$/, keywordRegexLookBehind = {'in':1,'return':1,'typeof':1}; function parseObjectLiteral(objectLiteralString) { // Trim leading and trailing spaces from the string var str = ko.utils.stringTrim(objectLiteralString); // Trim braces '{' surrounding the whole object literal if (str.charCodeAt(0) === 123) str = str.slice(1, -1); // Split into tokens var result = [], toks = str.match(bindingToken), key, values = [], depth = 0; if (toks) { // Append a comma so that we don't need a separate code block to deal with the last item toks.push(','); for (var i = 0, tok; tok = toks[i]; ++i) { var c = tok.charCodeAt(0); // A comma signals the end of a key/value pair if depth is zero if (c === 44) { // "," if (depth <= 0) { result.push((key && values.length) ? {key: key, value: values.join('')} : {'unknown': key || values.join('')}); key = depth = 0; values = []; continue; } // Simply skip the colon that separates the name and value } else if (c === 58) { // ":" if (!depth && !key && values.length === 1) { key = values.pop(); continue; } // A set of slashes is initially matched as a regular expression, but could be division } else if (c === 47 && i && tok.length > 1) { // "/" // Look at the end of the previous token to determine if the slash is actually division var match = toks[i-1].match(divisionLookBehind); if (match && !keywordRegexLookBehind[match[0]]) { // The slash is actually a division punctuator; re-parse the remainder of the string (not including the slash) str = str.substr(str.indexOf(tok) + 1); toks = str.match(bindingToken); toks.push(','); i = -1; // Continue with just the slash tok = '/'; } // Increment depth for parentheses, braces, and brackets so that interior commas are ignored } else if (c === 40 || c === 123 || c === 91) { // '(', '{', '[' ++depth; } else if (c === 41 || c === 125 || c === 93) { // ')', '}', ']' --depth; // The key will be the first token; if it's a string, trim the quotes } else if (!key && !values.length && (c === 34 || c === 39)) { // '"', "'" tok = tok.slice(1, -1); } values.push(tok); } } return result; } // Two-way bindings include a write function that allow the handler to update the value even if it's not an observable. var twoWayBindings = {}; function preProcessBindings(bindingsStringOrKeyValueArray, bindingOptions) { bindingOptions = bindingOptions || {}; function processKeyValue(key, val) { var writableVal; function callPreprocessHook(obj) { return (obj && obj['preprocess']) ? (val = obj['preprocess'](val, key, processKeyValue)) : true; } if (!bindingParams) { if (!callPreprocessHook(ko['getBindingHandler'](key))) return; if (twoWayBindings[key] && (writableVal = getWriteableValue(val))) { // For two-way bindings, provide a write method in case the value // isn't a writable observable. propertyAccessorResultStrings.push("'" + key + "':function(_z){" + writableVal + "=_z}"); } } // Values are wrapped in a function so that each value can be accessed independently if (makeValueAccessors) { val = 'function(){return ' + val + ' }'; } resultStrings.push("'" + key + "':" + val); } var resultStrings = [], propertyAccessorResultStrings = [], makeValueAccessors = bindingOptions['valueAccessors'], bindingParams = bindingOptions['bindingParams'], keyValueArray = typeof bindingsStringOrKeyValueArray === "string" ? parseObjectLiteral(bindingsStringOrKeyValueArray) : bindingsStringOrKeyValueArray; ko.utils.arrayForEach(keyValueArray, function(keyValue) { processKeyValue(keyValue.key || keyValue['unknown'], keyValue.value); }); if (propertyAccessorResultStrings.length) processKeyValue('_ko_property_writers', "{" + propertyAccessorResultStrings.join(",") + " }"); return resultStrings.join(","); } return { bindingRewriteValidators: [], twoWayBindings: twoWayBindings, parseObjectLiteral: parseObjectLiteral, preProcessBindings: preProcessBindings, keyValueArrayContainsKey: function(keyValueArray, key) { for (var i = 0; i < keyValueArray.length; i++) if (keyValueArray[i]['key'] == key) return true; return false; }, // Internal, private KO utility for updating model properties from within bindings // property: If the property being updated is (or might be) an observable, pass it here // If it turns out to be a writable observable, it will be written to directly // allBindings: An object with a get method to retrieve bindings in the current execution context. // This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable // key: The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus' // value: The value to be written // checkIfDifferent: If true, and if the property being written is a writable observable, the value will only be written if // it is !== existing value on that writable observable writeValueToProperty: function(property, allBindings, key, value, checkIfDifferent) { if (!property || !ko.isObservable(property)) { var propWriters = allBindings.get('_ko_property_writers'); if (propWriters && propWriters[key]) propWriters[key](value); } else if (ko.isWriteableObservable(property) && (!checkIfDifferent || property.peek() !== value)) { property(value); } } }; })(); ko.exportSymbol('expressionRewriting', ko.expressionRewriting); ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators); ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral); ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings); // Making bindings explicitly declare themselves as "two way" isn't ideal in the long term (it would be better if // all bindings could use an official 'property writer' API without needing to declare that they might). However, // since this is not, and has never been, a public API (_ko_property_writers was never documented), it's acceptable // as an internal implementation detail in the short term. // For those developers who rely on _ko_property_writers in their custom bindings, we expose _twoWayBindings as an // undocumented feature that makes it relatively easy to upgrade to KO 3.0. However, this is still not an official // public API, and we reserve the right to remove it at any time if we create a real public property writers API. ko.exportSymbol('expressionRewriting._twoWayBindings', ko.expressionRewriting.twoWayBindings); // For backward compatibility, define the following aliases. (Previously, these function names were misleading because // they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.) ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting); ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings); (function() { // "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes // may be used to represent hierarchy (in addition to the DOM's natural hierarchy). // If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state // of that virtual hierarchy // // The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->) // without having to scatter special cases all over the binding and templating code. // IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186) // but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property. // So, use node.text where available, and node.nodeValue elsewhere var commentNodesHaveTextProperty = document && document.createComment("test").text === "<!--test-->"; var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+([\s\S]+))?\s*-->$/ : /^\s*ko(?:\s+([\s\S]+))?\s*$/; var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/; var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true }; function isStartComment(node) { return (node.nodeType == 8) && startCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue); } function isEndComment(node) { return (node.nodeType == 8) && endCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue); } function getVirtualChildren(startComment, allowUnbalanced) { var currentNode = startComment; var depth = 1; var children = []; while (currentNode = currentNode.nextSibling) { if (isEndComment(currentNode)) { depth--; if (depth === 0) return children; } children.push(currentNode); if (isStartComment(currentNode)) depth++; } if (!allowUnbalanced) throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue); return null; } function getMatchingEndComment(startComment, allowUnbalanced) { var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced); if (allVirtualChildren) { if (allVirtualChildren.length > 0) return allVirtualChildren[allVirtualChildren.length - 1].nextSibling; return startComment.nextSibling; } else return null; // Must have no matching end comment, and allowUnbalanced is true } function getUnbalancedChildTags(node) { // e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span> // from <div>OK</div><!-- /ko --><!-- /ko -->, returns: <!-- /ko --><!-- /ko --> var childNode = node.firstChild, captureRemaining = null; if (childNode) { do { if (captureRemaining) // We already hit an unbalanced node and are now just scooping up all subsequent nodes captureRemaining.push(childNode); else if (isStartComment(childNode)) { var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true); if (matchingEndComment) // It's a balanced tag, so skip immediately to the end of this virtual set childNode = matchingEndComment; else captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point } else if (isEndComment(childNode)) { captureRemaining = [childNode]; // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing } } while (childNode = childNode.nextSibling); } return captureRemaining; } ko.virtualElements = { allowedBindings: {}, childNodes: function(node) { return isStartComment(node) ? getVirtualChildren(node) : node.childNodes; }, emptyNode: function(node) { if (!isStartComment(node)) ko.utils.emptyDomNode(node); else { var virtualChildren = ko.virtualElements.childNodes(node); for (var i = 0, j = virtualChildren.length; i < j; i++) ko.removeNode(virtualChildren[i]); } }, setDomNodeChildren: function(node, childNodes) { if (!isStartComment(node)) ko.utils.setDomNodeChildren(node, childNodes); else { ko.virtualElements.emptyNode(node); var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children for (var i = 0, j = childNodes.length; i < j; i++) endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode); } }, prepend: function(containerNode, nodeToPrepend) { if (!isStartComment(containerNode)) { if (containerNode.firstChild) containerNode.insertBefore(nodeToPrepend, containerNode.firstChild); else containerNode.appendChild(nodeToPrepend); } else { // Start comments must always have a parent and at least one following sibling (the end comment) containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling); } }, insertAfter: function(containerNode, nodeToInsert, insertAfterNode) { if (!insertAfterNode) { ko.virtualElements.prepend(containerNode, nodeToInsert); } else if (!isStartComment(containerNode)) { // Insert after insertion point if (insertAfterNode.nextSibling) containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling); else containerNode.appendChild(nodeToInsert); } else { // Children of start comments must always have a parent and at least one following sibling (the end comment) containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling); } }, firstChild: function(node) { if (!isStartComment(node)) return node.firstChild; if (!node.nextSibling || isEndComment(node.nextSibling)) return null; return node.nextSibling; }, nextSibling: function(node) { if (isStartComment(node)) node = getMatchingEndComment(node); if (node.nextSibling && isEndComment(node.nextSibling)) return null; return node.nextSibling; }, hasBindingValue: isStartComment, virtualNodeBindingValue: function(node) { var regexMatch = (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex); return regexMatch ? regexMatch[1] : null; }, normaliseVirtualElementDomStructure: function(elementVerified) { // Workaround for https://github.com/SteveSanderson/knockout/issues/155 // (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes // that are direct descendants of <ul> into the preceding <li>) if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)]) return; // Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags // must be intended to appear *after* that child, so move them there. var childNode = elementVerified.firstChild; if (childNode) { do { if (childNode.nodeType === 1) { var unbalancedTags = getUnbalancedChildTags(childNode); if (unbalancedTags) { // Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child var nodeToInsertBefore = childNode.nextSibling; for (var i = 0; i < unbalancedTags.length; i++) { if (nodeToInsertBefore) elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore); else elementVerified.appendChild(unbalancedTags[i]); } } } } while (childNode = childNode.nextSibling); } } }; })(); ko.exportSymbol('virtualElements', ko.virtualElements); ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings); ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode); //ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild); // firstChild is not minified ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter); //ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling); // nextSibling is not minified ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend); ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren); (function() { var defaultBindingAttributeName = "data-bind"; ko.bindingProvider = function() { this.bindingCache = {}; }; ko.utils.extend(ko.bindingProvider.prototype, { 'nodeHasBindings': function(node) { switch (node.nodeType) { case 1: // Element return node.getAttribute(defaultBindingAttributeName) != null || ko.components['getComponentNameForNode'](node); case 8: // Comment node return ko.virtualElements.hasBindingValue(node); default: return false; } }, 'getBindings': function(node, bindingContext) { var bindingsString = this['getBindingsString'](node, bindingContext), parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null; return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ false); }, 'getBindingAccessors': function(node, bindingContext) { var bindingsString = this['getBindingsString'](node, bindingContext), parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node, { 'valueAccessors': true }) : null; return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ true); }, // The following function is only used internally by this default provider. // It's not part of the interface definition for a general binding provider. 'getBindingsString': function(node, bindingContext) { switch (node.nodeType) { case 1: return node.getAttribute(defaultBindingAttributeName); // Element case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node default: return null; } }, // The following function is only used internally by this default provider. // It's not part of the interface definition for a general binding provider. 'parseBindingsString': function(bindingsString, bindingContext, node, options) { try { var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache, options); return bindingFunction(bindingContext, node); } catch (ex) { ex.message = "Unable to parse bindings.\nBindings value: " + bindingsString + "\nMessage: " + ex.message; throw ex; } } }); ko.bindingProvider['instance'] = new ko.bindingProvider(); function createBindingsStringEvaluatorViaCache(bindingsString, cache, options) { var cacheKey = bindingsString + (options && options['valueAccessors'] || ''); return cache[cacheKey] || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString, options)); } function createBindingsStringEvaluator(bindingsString, options) { // Build the source for a function that evaluates "expression" // For each scope variable, add an extra level of "with" nesting // Example result: with(sc1) { with(sc0) { return (expression) } } var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString, options), functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}"; return new Function("$context", "$element", functionBody); } })(); ko.exportSymbol('bindingProvider', ko.bindingProvider); (function () { ko.bindingHandlers = {}; // The following element types will not be recursed into during binding. var bindingDoesNotRecurseIntoElementTypes = { // Don't want bindings that operate on text nodes to mutate <script> and <textarea> contents, // because it's unexpected and a potential XSS issue. // Also bindings should not operate on <template> elements since this breaks in Internet Explorer // and because such elements' contents are always intended to be bound in a different context // from where they appear in the document. 'script': true, 'textarea': true, 'template': true }; // Use an overridable method for retrieving binding handlers so that a plugins may support dynamically created handlers ko['getBindingHandler'] = function(bindingKey) { return ko.bindingHandlers[bindingKey]; }; // The ko.bindingContext constructor is only called directly to create the root context. For child // contexts, use bindingContext.createChildContext or bindingContext.extend. ko.bindingContext = function(dataItemOrAccessor, parentContext, dataItemAlias, extendCallback, options) { // The binding context object includes static properties for the current, parent, and root view models. // If a view model is actually stored in an observable, the corresponding binding context object, and // any child contexts, must be updated when the view model is changed. function updateContext() { // Most of the time, the context will directly get a view model object, but if a function is given, // we call the function to retrieve the view model. If the function accesses any observables or returns // an observable, the dependency is tracked, and those observables can later cause the binding // context to be updated. var dataItemOrObservable = isFunc ? dataItemOrAccessor() : dataItemOrAccessor, dataItem = ko.utils.unwrapObservable(dataItemOrObservable); if (parentContext) { // When a "parent" context is given, register a dependency on the parent context. Thus whenever the // parent context is updated, this context will also be updated. if (parentContext._subscribable) parentContext._subscribable(); // Copy $root and any custom properties from the parent context ko.utils.extend(self, parentContext); // Because the above copy overwrites our own properties, we need to reset them. self._subscribable = subscribable; } else { self['$parents'] = []; self['$root'] = dataItem; // Export 'ko' in the binding context so it will be available in bindings and templates // even if 'ko' isn't exported as a global, such as when using an AMD loader. // See https://github.com/SteveSanderson/knockout/issues/490 self['ko'] = ko; } self['$rawData'] = dataItemOrObservable; self['$data'] = dataItem; if (dataItemAlias) self[dataItemAlias] = dataItem; // The extendCallback function is provided when creating a child context or extending a context. // It handles the specific actions needed to finish setting up the binding context. Actions in this // function could also add dependencies to this binding context. if (extendCallback) extendCallback(self, parentContext, dataItem); return self['$data']; } function disposeWhen() { return nodes && !ko.utils.anyDomNodeIsAttachedToDocument(nodes); } var self = this, isFunc = typeof(dataItemOrAccessor) == "function" && !ko.isObservable(dataItemOrAccessor), nodes, subscribable; if (options && options['exportDependencies']) { // The "exportDependencies" option means that the calling code will track any dependencies and re-create // the binding context when they change. updateContext(); } else { subscribable = ko.dependentObservable(updateContext, null, { disposeWhen: disposeWhen, disposeWhenNodeIsRemoved: true }); // At this point, the binding context has been initialized, and the "subscribable" computed observable is // subscribed to any observables that were accessed in the process. If there is nothing to track, the // computed will be inactive, and we can safely throw it away. If it's active, the computed is stored in // the context object. if (subscribable.isActive()) { self._subscribable = subscribable; // Always notify because even if the model ($data) hasn't changed, other context properties might have changed subscribable['equalityComparer'] = null; // We need to be able to dispose of this computed observable when it's no longer needed. This would be // easy if we had a single node to watch, but binding contexts can be used by many different nodes, and // we cannot assume that those nodes have any relation to each other. So instead we track any node that // the context is attached to, and dispose the computed when all of those nodes have been cleaned. // Add properties to *subscribable* instead of *self* because any properties added to *self* may be overwritten on updates nodes = []; subscribable._addNode = function(node) { nodes.push(node); ko.utils.domNodeDisposal.addDisposeCallback(node, function(node) { ko.utils.arrayRemoveItem(nodes, node); if (!nodes.length) { subscribable.dispose(); self._subscribable = subscribable = undefined; } }); }; } } } // Extend the binding context hierarchy with a new view model object. If the parent context is watching // any observables, the new child context will automatically get a dependency on the parent context. // But this does not mean that the $data value of the child context will also get updated. If the child // view model also depends on the parent view model, you must provide a function that returns the correct // view model on each update. ko.bindingContext.prototype['createChildContext'] = function (dataItemOrAccessor, dataItemAlias, extendCallback, options) { return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, function(self, parentContext) { // Extend the context hierarchy by setting the appropriate pointers self['$parentContext'] = parentContext; self['$parent'] = parentContext['$data']; self['$parents'] = (parentContext['$parents'] || []).slice(0); self['$parents'].unshift(self['$parent']); if (extendCallback) extendCallback(self); }, options); }; // Extend the binding context with new custom properties. This doesn't change the context hierarchy. // Similarly to "child" contexts, provide a function here to make sure that the correct values are set // when an observable view model is updated. ko.bindingContext.prototype['extend'] = function(properties) { // If the parent context references an observable view model, "_subscribable" will always be the // latest view model object. If not, "_subscribable" isn't set, and we can use the static "$data" value. return new ko.bindingContext(this._subscribable || this['$data'], this, null, function(self, parentContext) { // This "child" context doesn't directly track a parent observable view model, // so we need to manually set the $rawData value to match the parent. self['$rawData'] = parentContext['$rawData']; ko.utils.extend(self, typeof(properties) == "function" ? properties() : properties); }); }; ko.bindingContext.prototype.createStaticChildContext = function (dataItemOrAccessor, dataItemAlias) { return this['createChildContext'](dataItemOrAccessor, dataItemAlias, null, { "exportDependencies": true }); }; // Returns the valueAccesor function for a binding value function makeValueAccessor(value) { return function() { return value; }; } // Returns the value of a valueAccessor function function evaluateValueAccessor(valueAccessor) { return valueAccessor(); } // Given a function that returns bindings, create and return a new object that contains // binding value-accessors functions. Each accessor function calls the original function // so that it always gets the latest value and all dependencies are captured. This is used // by ko.applyBindingsToNode and getBindingsAndMakeAccessors. function makeAccessorsFromFunction(callback) { return ko.utils.objectMap(ko.dependencyDetection.ignore(callback), function(value, key) { return function() { return callback()[key]; }; }); } // Given a bindings function or object, create and return a new object that contains // binding value-accessors functions. This is used by ko.applyBindingsToNode. function makeBindingAccessors(bindings, context, node) { if (typeof bindings === 'function') { return makeAccessorsFromFunction(bindings.bind(null, context, node)); } else { return ko.utils.objectMap(bindings, makeValueAccessor); } } // This function is used if the binding provider doesn't include a getBindingAccessors function. // It must be called with 'this' set to the provider instance. function getBindingsAndMakeAccessors(node, context) { return makeAccessorsFromFunction(this['getBindings'].bind(this, node, context)); } function validateThatBindingIsAllowedForVirtualElements(bindingName) { var validator = ko.virtualElements.allowedBindings[bindingName]; if (!validator) throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements") } function applyBindingsToDescendantsInternal (bindingContext, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) { var currentChild, nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement), provider = ko.bindingProvider['instance'], preprocessNode = provider['preprocessNode']; // Preprocessing allows a binding provider to mutate a node before bindings are applied to it. For example it's // possible to insert new siblings after it, and/or replace the node with a different one. This can be used to // implement custom binding syntaxes, such as {{ value }} for string interpolation, or custom element types that // trigger insertion of <template> contents at that point in the document. if (preprocessNode) { while (currentChild = nextInQueue) { nextInQueue = ko.virtualElements.nextSibling(currentChild); preprocessNode.call(provider, currentChild); } // Reset nextInQueue for the next loop nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement); } while (currentChild = nextInQueue) { // Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position nextInQueue = ko.virtualElements.nextSibling(currentChild); applyBindingsToNodeAndDescendantsInternal(bindingContext, currentChild, bindingContextsMayDifferFromDomParentElement); } } function applyBindingsToNodeAndDescendantsInternal (bindingContext, nodeVerified, bindingContextMayDifferFromDomParentElement) { var shouldBindDescendants = true; // Perf optimisation: Apply bindings only if... // (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context) // Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those // (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template) var isElement = (nodeVerified.nodeType === 1); if (isElement) // Workaround IE <= 8 HTML parsing weirdness ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified); var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement) // Case (1) || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified); // Case (2) if (shouldApplyBindings) shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, bindingContext, bindingContextMayDifferFromDomParentElement)['shouldBindDescendants']; if (shouldBindDescendants && !bindingDoesNotRecurseIntoElementTypes[ko.utils.tagNameLower(nodeVerified)]) { // We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So, // * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode, // hence bindingContextsMayDifferFromDomParentElement is false // * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may // skip over any number of intermediate virtual elements, any of which might define a custom binding context, // hence bindingContextsMayDifferFromDomParentElement is true applyBindingsToDescendantsInternal(bindingContext, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement); } } var boundElementDomDataKey = ko.utils.domData.nextKey(); function topologicalSortBindings(bindings) { // Depth-first sort var result = [], // The list of key/handler pairs that we will return bindingsConsidered = {}, // A temporary record of which bindings are already in 'result' cyclicDependencyStack = []; // Keeps track of a depth-search so that, if there's a cycle, we know which bindings caused it ko.utils.objectForEach(bindings, function pushBinding(bindingKey) { if (!bindingsConsidered[bindingKey]) { var binding = ko['getBindingHandler'](bindingKey); if (binding) { // First add dependencies (if any) of the current binding if (binding['after']) { cyclicDependencyStack.push(bindingKey); ko.utils.arrayForEach(binding['after'], function(bindingDependencyKey) { if (bindings[bindingDependencyKey]) { if (ko.utils.arrayIndexOf(cyclicDependencyStack, bindingDependencyKey) !== -1) { throw Error("Cannot combine the following bindings, because they have a cyclic dependency: " + cyclicDependencyStack.join(", ")); } else { pushBinding(bindingDependencyKey); } } }); cyclicDependencyStack.length--; } // Next add the current binding result.push({ key: bindingKey, handler: binding }); } bindingsConsidered[bindingKey] = true; } }); return result; } function applyBindingsToNodeInternal(node, sourceBindings, bindingContext, bindingContextMayDifferFromDomParentElement) { // Prevent multiple applyBindings calls for the same node, except when a binding value is specified var alreadyBound = ko.utils.domData.get(node, boundElementDomDataKey); if (!sourceBindings) { if (alreadyBound) { throw Error("You cannot apply bindings multiple times to the same element."); } ko.utils.domData.set(node, boundElementDomDataKey, true); } // Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because // we can easily recover it just by scanning up the node's ancestors in the DOM // (note: here, parent node means "real DOM parent" not "virtual parent", as there's no O(1) way to find the virtual parent) if (!alreadyBound && bindingContextMayDifferFromDomParentElement) ko.storedBindingContextForNode(node, bindingContext); // Use bindings if given, otherwise fall back on asking the bindings provider to give us some bindings var bindings; if (sourceBindings && typeof sourceBindings !== 'function') { bindings = sourceBindings; } else { var provider = ko.bindingProvider['instance'], getBindings = provider['getBindingAccessors'] || getBindingsAndMakeAccessors; // Get the binding from the provider within a computed observable so that we can update the bindings whenever // the binding context is updated or if the binding provider accesses observables. var bindingsUpdater = ko.dependentObservable( function() { bindings = sourceBindings ? sourceBindings(bindingContext, node) : getBindings.call(provider, node, bindingContext); // Register a dependency on the binding context to support observable view models. if (bindings && bindingContext._subscribable) bindingContext._subscribable(); return bindings; }, null, { disposeWhenNodeIsRemoved: node } ); if (!bindings || !bindingsUpdater.isActive()) bindingsUpdater = null; } var bindingHandlerThatControlsDescendantBindings; if (bindings) { // Return the value accessor for a given binding. When bindings are static (won't be updated because of a binding // context update), just return the value accessor from the binding. Otherwise, return a function that always gets // the latest binding value and registers a dependency on the binding updater. var getValueAccessor = bindingsUpdater ? function(bindingKey) { return function() { return evaluateValueAccessor(bindingsUpdater()[bindingKey]); }; } : function(bindingKey) { return bindings[bindingKey]; }; // Use of allBindings as a function is maintained for backwards compatibility, but its use is deprecated function allBindings() { return ko.utils.objectMap(bindingsUpdater ? bindingsUpdater() : bindings, evaluateValueAccessor); } // The following is the 3.x allBindings API allBindings['get'] = function(key) { return bindings[key] && evaluateValueAccessor(getValueAccessor(key)); }; allBindings['has'] = function(key) { return key in bindings; }; // First put the bindings into the right order var orderedBindings = topologicalSortBindings(bindings); // Go through the sorted bindings, calling init and update for each ko.utils.arrayForEach(orderedBindings, function(bindingKeyAndHandler) { // Note that topologicalSortBindings has already filtered out any nonexistent binding handlers, // so bindingKeyAndHandler.handler will always be nonnull. var handlerInitFn = bindingKeyAndHandler.handler["init"], handlerUpdateFn = bindingKeyAndHandler.handler["update"], bindingKey = bindingKeyAndHandler.key; if (node.nodeType === 8) { validateThatBindingIsAllowedForVirtualElements(bindingKey); } try { // Run init, ignoring any dependencies if (typeof handlerInitFn == "function") { ko.dependencyDetection.ignore(function() { var initResult = handlerInitFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext); // If this binding handler claims to control descendant bindings, make a note of this if (initResult && initResult['controlsDescendantBindings']) { if (bindingHandlerThatControlsDescendantBindings !== undefined) throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element."); bindingHandlerThatControlsDescendantBindings = bindingKey; } }); } // Run update in its own computed wrapper if (typeof handlerUpdateFn == "function") { ko.dependentObservable( function() { handlerUpdateFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext); }, null, { disposeWhenNodeIsRemoved: node } ); } } catch (ex) { ex.message = "Unable to process binding \"" + bindingKey + ": " + bindings[bindingKey] + "\"\nMessage: " + ex.message; throw ex; } }); } return { 'shouldBindDescendants': bindingHandlerThatControlsDescendantBindings === undefined }; }; var storedBindingContextDomDataKey = ko.utils.domData.nextKey(); ko.storedBindingContextForNode = function (node, bindingContext) { if (arguments.length == 2) { ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext); if (bindingContext._subscribable) bindingContext._subscribable._addNode(node); } else { return ko.utils.domData.get(node, storedBindingContextDomDataKey); } } function getBindingContext(viewModelOrBindingContext) { return viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext) ? viewModelOrBindingContext : new ko.bindingContext(viewModelOrBindingContext); } ko.applyBindingAccessorsToNode = function (node, bindings, viewModelOrBindingContext) { if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness ko.virtualElements.normaliseVirtualElementDomStructure(node); return applyBindingsToNodeInternal(node, bindings, getBindingContext(viewModelOrBindingContext), true); }; ko.applyBindingsToNode = function (node, bindings, viewModelOrBindingContext) { var context = getBindingContext(viewModelOrBindingContext); return ko.applyBindingAccessorsToNode(node, makeBindingAccessors(bindings, context, node), context); }; ko.applyBindingsToDescendants = function(viewModelOrBindingContext, rootNode) { if (rootNode.nodeType === 1 || rootNode.nodeType === 8) applyBindingsToDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true); }; ko.applyBindings = function (viewModelOrBindingContext, rootNode) { // If jQuery is loaded after Knockout, we won't initially have access to it. So save it here. if (!jQueryInstance && window['jQuery']) { jQueryInstance = window['jQuery']; } if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8)) throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node"); rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional applyBindingsToNodeAndDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true); }; // Retrieving binding context from arbitrary nodes ko.contextFor = function(node) { // We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them) switch (node.nodeType) { case 1: case 8: var context = ko.storedBindingContextForNode(node); if (context) return context; if (node.parentNode) return ko.contextFor(node.parentNode); break; } return undefined; }; ko.dataFor = function(node) { var context = ko.contextFor(node); return context ? context['$data'] : undefined; }; ko.exportSymbol('bindingHandlers', ko.bindingHandlers); ko.exportSymbol('applyBindings', ko.applyBindings); ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants); ko.exportSymbol('applyBindingAccessorsToNode', ko.applyBindingAccessorsToNode); ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode); ko.exportSymbol('contextFor', ko.contextFor); ko.exportSymbol('dataFor', ko.dataFor); })(); (function(undefined) { var loadingSubscribablesCache = {}, // Tracks component loads that are currently in flight loadedDefinitionsCache = {}; // Tracks component loads that have already completed ko.components = { get: function(componentName, callback) { var cachedDefinition = getObjectOwnProperty(loadedDefinitionsCache, componentName); if (cachedDefinition) { // It's already loaded and cached. Reuse the same definition object. // Note that for API consistency, even cache hits complete asynchronously by default. // You can bypass this by putting synchronous:true on your component config. if (cachedDefinition.isSynchronousComponent) { ko.dependencyDetection.ignore(function() { // See comment in loaderRegistryBehaviors.js for reasoning callback(cachedDefinition.definition); }); } else { ko.tasks.schedule(function() { callback(cachedDefinition.definition); }); } } else { // Join the loading process that is already underway, or start a new one. loadComponentAndNotify(componentName, callback); } }, clearCachedDefinition: function(componentName) { delete loadedDefinitionsCache[componentName]; }, _getFirstResultFromLoaders: getFirstResultFromLoaders }; function getObjectOwnProperty(obj, propName) { return obj.hasOwnProperty(propName) ? obj[propName] : undefined; } function loadComponentAndNotify(componentName, callback) { var subscribable = getObjectOwnProperty(loadingSubscribablesCache, componentName), completedAsync; if (!subscribable) { // It's not started loading yet. Start loading, and when it's done, move it to loadedDefinitionsCache. subscribable = loadingSubscribablesCache[componentName] = new ko.subscribable(); subscribable.subscribe(callback); beginLoadingComponent(componentName, function(definition, config) { var isSynchronousComponent = !!(config && config['synchronous']); loadedDefinitionsCache[componentName] = { definition: definition, isSynchronousComponent: isSynchronousComponent }; delete loadingSubscribablesCache[componentName]; // For API consistency, all loads complete asynchronously. However we want to avoid // adding an extra task schedule if it's unnecessary (i.e., the completion is already // async). // // You can bypass the 'always asynchronous' feature by putting the synchronous:true // flag on your component configuration when you register it. if (completedAsync || isSynchronousComponent) { // Note that notifySubscribers ignores any dependencies read within the callback. // See comment in loaderRegistryBehaviors.js for reasoning subscribable['notifySubscribers'](definition); } else { ko.tasks.schedule(function() { subscribable['notifySubscribers'](definition); }); } }); completedAsync = true; } else { subscribable.subscribe(callback); } } function beginLoadingComponent(componentName, callback) { getFirstResultFromLoaders('getConfig', [componentName], function(config) { if (config) { // We have a config, so now load its definition getFirstResultFromLoaders('loadComponent', [componentName, config], function(definition) { callback(definition, config); }); } else { // The component has no config - it's unknown to all the loaders. // Note that this is not an error (e.g., a module loading error) - that would abort the // process and this callback would not run. For this callback to run, all loaders must // have confirmed they don't know about this component. callback(null, null); } }); } function getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders) { // On the first call in the stack, start with the full set of loaders if (!candidateLoaders) { candidateLoaders = ko.components['loaders'].slice(0); // Use a copy, because we'll be mutating this array } // Try the next candidate var currentCandidateLoader = candidateLoaders.shift(); if (currentCandidateLoader) { var methodInstance = currentCandidateLoader[methodName]; if (methodInstance) { var wasAborted = false, synchronousReturnValue = methodInstance.apply(currentCandidateLoader, argsExceptCallback.concat(function(result) { if (wasAborted) { callback(null); } else if (result !== null) { // This candidate returned a value. Use it. callback(result); } else { // Try the next candidate getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders); } })); // Currently, loaders may not return anything synchronously. This leaves open the possibility // that we'll extend the API to support synchronous return values in the future. It won't be // a breaking change, because currently no loader is allowed to return anything except undefined. if (synchronousReturnValue !== undefined) { wasAborted = true; // Method to suppress exceptions will remain undocumented. This is only to keep // KO's specs running tidily, since we can observe the loading got aborted without // having exceptions cluttering up the console too. if (!currentCandidateLoader['suppressLoaderExceptions']) { throw new Error('Component loaders must supply values by invoking the callback, not by returning values synchronously.'); } } } else { // This candidate doesn't have the relevant handler. Synchronously move on to the next one. getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders); } } else { // No candidates returned a value callback(null); } } // Reference the loaders via string name so it's possible for developers // to replace the whole array by assigning to ko.components.loaders ko.components['loaders'] = []; ko.exportSymbol('components', ko.components); ko.exportSymbol('components.get', ko.components.get); ko.exportSymbol('components.clearCachedDefinition', ko.components.clearCachedDefinition); })(); (function(undefined) { // The default loader is responsible for two things: // 1. Maintaining the default in-memory registry of component configuration objects // (i.e., the thing you're writing to when you call ko.components.register(someName, ...)) // 2. Answering requests for components by fetching configuration objects // from that default in-memory registry and resolving them into standard // component definition objects (of the form { createViewModel: ..., template: ... }) // Custom loaders may override either of these facilities, i.e., // 1. To supply configuration objects from some other source (e.g., conventions) // 2. Or, to resolve configuration objects by loading viewmodels/templates via arbitrary logic. var defaultConfigRegistry = {}; ko.components.register = function(componentName, config) { if (!config) { throw new Error('Invalid configuration for ' + componentName); } if (ko.components.isRegistered(componentName)) { throw new Error('Component ' + componentName + ' is already registered'); } defaultConfigRegistry[componentName] = config; }; ko.components.isRegistered = function(componentName) { return defaultConfigRegistry.hasOwnProperty(componentName); }; ko.components.unregister = function(componentName) { delete defaultConfigRegistry[componentName]; ko.components.clearCachedDefinition(componentName); }; ko.components.defaultLoader = { 'getConfig': function(componentName, callback) { var result = defaultConfigRegistry.hasOwnProperty(componentName) ? defaultConfigRegistry[componentName] : null; callback(result); }, 'loadComponent': function(componentName, config, callback) { var errorCallback = makeErrorCallback(componentName); possiblyGetConfigFromAmd(errorCallback, config, function(loadedConfig) { resolveConfig(componentName, errorCallback, loadedConfig, callback); }); }, 'loadTemplate': function(componentName, templateConfig, callback) { resolveTemplate(makeErrorCallback(componentName), templateConfig, callback); }, 'loadViewModel': function(componentName, viewModelConfig, callback) { resolveViewModel(makeErrorCallback(componentName), viewModelConfig, callback); } }; var createViewModelKey = 'createViewModel'; // Takes a config object of the form { template: ..., viewModel: ... }, and asynchronously convert it // into the standard component definition format: // { template: <ArrayOfDomNodes>, createViewModel: function(params, componentInfo) { ... } }. // Since both template and viewModel may need to be resolved asynchronously, both tasks are performed // in parallel, and the results joined when both are ready. We don't depend on any promises infrastructure, // so this is implemented manually below. function resolveConfig(componentName, errorCallback, config, callback) { var result = {}, makeCallBackWhenZero = 2, tryIssueCallback = function() { if (--makeCallBackWhenZero === 0) { callback(result); } }, templateConfig = config['template'], viewModelConfig = config['viewModel']; if (templateConfig) { possiblyGetConfigFromAmd(errorCallback, templateConfig, function(loadedConfig) { ko.components._getFirstResultFromLoaders('loadTemplate', [componentName, loadedConfig], function(resolvedTemplate) { result['template'] = resolvedTemplate; tryIssueCallback(); }); }); } else { tryIssueCallback(); } if (viewModelConfig) { possiblyGetConfigFromAmd(errorCallback, viewModelConfig, function(loadedConfig) { ko.components._getFirstResultFromLoaders('loadViewModel', [componentName, loadedConfig], function(resolvedViewModel) { result[createViewModelKey] = resolvedViewModel; tryIssueCallback(); }); }); } else { tryIssueCallback(); } } function resolveTemplate(errorCallback, templateConfig, callback) { if (typeof templateConfig === 'string') { // Markup - parse it callback(ko.utils.parseHtmlFragment(templateConfig)); } else if (templateConfig instanceof Array) { // Assume already an array of DOM nodes - pass through unchanged callback(templateConfig); } else if (isDocumentFragment(templateConfig)) { // Document fragment - use its child nodes callback(ko.utils.makeArray(templateConfig.childNodes)); } else if (templateConfig['element']) { var element = templateConfig['element']; if (isDomElement(element)) { // Element instance - copy its child nodes callback(cloneNodesFromTemplateSourceElement(element)); } else if (typeof element === 'string') { // Element ID - find it, then copy its child nodes var elemInstance = document.getElementById(element); if (elemInstance) { callback(cloneNodesFromTemplateSourceElement(elemInstance)); } else { errorCallback('Cannot find element with ID ' + element); } } else { errorCallback('Unknown element type: ' + element); } } else { errorCallback('Unknown template value: ' + templateConfig); } } function resolveViewModel(errorCallback, viewModelConfig, callback) { if (typeof viewModelConfig === 'function') { // Constructor - convert to standard factory function format // By design, this does *not* supply componentInfo to the constructor, as the intent is that // componentInfo contains non-viewmodel data (e.g., the component's element) that should only // be used in factory functions, not viewmodel constructors. callback(function (params /*, componentInfo */) { return new viewModelConfig(params); }); } else if (typeof viewModelConfig[createViewModelKey] === 'function') { // Already a factory function - use it as-is callback(viewModelConfig[createViewModelKey]); } else if ('instance' in viewModelConfig) { // Fixed object instance - promote to createViewModel format for API consistency var fixedInstance = viewModelConfig['instance']; callback(function (params, componentInfo) { return fixedInstance; }); } else if ('viewModel' in viewModelConfig) { // Resolved AMD module whose value is of the form { viewModel: ... } resolveViewModel(errorCallback, viewModelConfig['viewModel'], callback); } else { errorCallback('Unknown viewModel value: ' + viewModelConfig); } } function cloneNodesFromTemplateSourceElement(elemInstance) { switch (ko.utils.tagNameLower(elemInstance)) { case 'script': return ko.utils.parseHtmlFragment(elemInstance.text); case 'textarea': return ko.utils.parseHtmlFragment(elemInstance.value); case 'template': // For browsers with proper <template> element support (i.e., where the .content property // gives a document fragment), use that document fragment. if (isDocumentFragment(elemInstance.content)) { return ko.utils.cloneNodes(elemInstance.content.childNodes); } } // Regular elements such as <div>, and <template> elements on old browsers that don't really // understand <template> and just treat it as a regular container return ko.utils.cloneNodes(elemInstance.childNodes); } function isDomElement(obj) { if (window['HTMLElement']) { return obj instanceof HTMLElement; } else { return obj && obj.tagName && obj.nodeType === 1; } } function isDocumentFragment(obj) { if (window['DocumentFragment']) { return obj instanceof DocumentFragment; } else { return obj && obj.nodeType === 11; } } function possiblyGetConfigFromAmd(errorCallback, config, callback) { if (typeof config['require'] === 'string') { // The config is the value of an AMD module if (amdRequire || window['require']) { (amdRequire || window['require'])([config['require']], callback); } else { errorCallback('Uses require, but no AMD loader is present'); } } else { callback(config); } } function makeErrorCallback(componentName) { return function (message) { throw new Error('Component \'' + componentName + '\': ' + message); }; } ko.exportSymbol('components.register', ko.components.register); ko.exportSymbol('components.isRegistered', ko.components.isRegistered); ko.exportSymbol('components.unregister', ko.components.unregister); // Expose the default loader so that developers can directly ask it for configuration // or to resolve configuration ko.exportSymbol('components.defaultLoader', ko.components.defaultLoader); // By default, the default loader is the only registered component loader ko.components['loaders'].push(ko.components.defaultLoader); // Privately expose the underlying config registry for use in old-IE shim ko.components._allRegisteredComponents = defaultConfigRegistry; })(); (function (undefined) { // Overridable API for determining which component name applies to a given node. By overriding this, // you can for example map specific tagNames to components that are not preregistered. ko.components['getComponentNameForNode'] = function(node) { var tagNameLower = ko.utils.tagNameLower(node); if (ko.components.isRegistered(tagNameLower)) { // Try to determine that this node can be considered a *custom* element; see https://github.com/knockout/knockout/issues/1603 if (tagNameLower.indexOf('-') != -1 || ('' + node) == "[object HTMLUnknownElement]" || (ko.utils.ieVersion <= 8 && node.tagName === tagNameLower)) { return tagNameLower; } } }; ko.components.addBindingsForCustomElement = function(allBindings, node, bindingContext, valueAccessors) { // Determine if it's really a custom element matching a component if (node.nodeType === 1) { var componentName = ko.components['getComponentNameForNode'](node); if (componentName) { // It does represent a component, so add a component binding for it allBindings = allBindings || {}; if (allBindings['component']) { // Avoid silently overwriting some other 'component' binding that may already be on the element throw new Error('Cannot use the "component" binding on a custom element matching a component'); } var componentBindingValue = { 'name': componentName, 'params': getComponentParamsFromCustomElement(node, bindingContext) }; allBindings['component'] = valueAccessors ? function() { return componentBindingValue; } : componentBindingValue; } } return allBindings; } var nativeBindingProviderInstance = new ko.bindingProvider(); function getComponentParamsFromCustomElement(elem, bindingContext) { var paramsAttribute = elem.getAttribute('params'); if (paramsAttribute) { var params = nativeBindingProviderInstance['parseBindingsString'](paramsAttribute, bindingContext, elem, { 'valueAccessors': true, 'bindingParams': true }), rawParamComputedValues = ko.utils.objectMap(params, function(paramValue, paramName) { return ko.computed(paramValue, null, { disposeWhenNodeIsRemoved: elem }); }), result = ko.utils.objectMap(rawParamComputedValues, function(paramValueComputed, paramName) { var paramValue = paramValueComputed.peek(); // Does the evaluation of the parameter value unwrap any observables? if (!paramValueComputed.isActive()) { // No it doesn't, so there's no need for any computed wrapper. Just pass through the supplied value directly. // Example: "someVal: firstName, age: 123" (whether or not firstName is an observable/computed) return paramValue; } else { // Yes it does. Supply a computed property that unwraps both the outer (binding expression) // level of observability, and any inner (resulting model value) level of observability. // This means the component doesn't have to worry about multiple unwrapping. If the value is a // writable observable, the computed will also be writable and pass the value on to the observable. return ko.computed({ 'read': function() { return ko.utils.unwrapObservable(paramValueComputed()); }, 'write': ko.isWriteableObservable(paramValue) && function(value) { paramValueComputed()(value); }, disposeWhenNodeIsRemoved: elem }); } }); // Give access to the raw computeds, as long as that wouldn't overwrite any custom param also called '$raw' // This is in case the developer wants to react to outer (binding) observability separately from inner // (model value) observability, or in case the model value observable has subobservables. if (!result.hasOwnProperty('$raw')) { result['$raw'] = rawParamComputedValues; } return result; } else { // For consistency, absence of a "params" attribute is treated the same as the presence of // any empty one. Otherwise component viewmodels need special code to check whether or not // 'params' or 'params.$raw' is null/undefined before reading subproperties, which is annoying. return { '$raw': {} }; } } // -------------------------------------------------------------------------------- // Compatibility code for older (pre-HTML5) IE browsers if (ko.utils.ieVersion < 9) { // Whenever you preregister a component, enable it as a custom element in the current document ko.components['register'] = (function(originalFunction) { return function(componentName) { document.createElement(componentName); // Allows IE<9 to parse markup containing the custom element return originalFunction.apply(this, arguments); } })(ko.components['register']); // Whenever you create a document fragment, enable all preregistered component names as custom elements // This is needed to make innerShiv/jQuery HTML parsing correctly handle the custom elements document.createDocumentFragment = (function(originalFunction) { return function() { var newDocFrag = originalFunction(), allComponents = ko.components._allRegisteredComponents; for (var componentName in allComponents) { if (allComponents.hasOwnProperty(componentName)) { newDocFrag.createElement(componentName); } } return newDocFrag; }; })(document.createDocumentFragment); } })();(function(undefined) { var componentLoadingOperationUniqueId = 0; ko.bindingHandlers['component'] = { 'init': function(element, valueAccessor, ignored1, ignored2, bindingContext) { var currentViewModel, currentLoadingOperationId, disposeAssociatedComponentViewModel = function () { var currentViewModelDispose = currentViewModel && currentViewModel['dispose']; if (typeof currentViewModelDispose === 'function') { currentViewModelDispose.call(currentViewModel); } currentViewModel = null; // Any in-flight loading operation is no longer relevant, so make sure we ignore its completion currentLoadingOperationId = null; }, originalChildNodes = ko.utils.makeArray(ko.virtualElements.childNodes(element)); ko.utils.domNodeDisposal.addDisposeCallback(element, disposeAssociatedComponentViewModel); ko.computed(function () { var value = ko.utils.unwrapObservable(valueAccessor()), componentName, componentParams; if (typeof value === 'string') { componentName = value; } else { componentName = ko.utils.unwrapObservable(value['name']); componentParams = ko.utils.unwrapObservable(value['params']); } if (!componentName) { throw new Error('No component name specified'); } var loadingOperationId = currentLoadingOperationId = ++componentLoadingOperationUniqueId; ko.components.get(componentName, function(componentDefinition) { // If this is not the current load operation for this element, ignore it. if (currentLoadingOperationId !== loadingOperationId) { return; } // Clean up previous state disposeAssociatedComponentViewModel(); // Instantiate and bind new component. Implicitly this cleans any old DOM nodes. if (!componentDefinition) { throw new Error('Unknown component \'' + componentName + '\''); } cloneTemplateIntoElement(componentName, componentDefinition, element); var componentViewModel = createViewModel(componentDefinition, element, originalChildNodes, componentParams), childBindingContext = bindingContext['createChildContext'](componentViewModel, /* dataItemAlias */ undefined, function(ctx) { ctx['$component'] = componentViewModel; ctx['$componentTemplateNodes'] = originalChildNodes; }); currentViewModel = componentViewModel; ko.applyBindingsToDescendants(childBindingContext, element); }); }, null, { disposeWhenNodeIsRemoved: element }); return { 'controlsDescendantBindings': true }; } }; ko.virtualElements.allowedBindings['component'] = true; function cloneTemplateIntoElement(componentName, componentDefinition, element) { var template = componentDefinition['template']; if (!template) { throw new Error('Component \'' + componentName + '\' has no template'); } var clonedNodesArray = ko.utils.cloneNodes(template); ko.virtualElements.setDomNodeChildren(element, clonedNodesArray); } function createViewModel(componentDefinition, element, originalChildNodes, componentParams) { var componentViewModelFactory = componentDefinition['createViewModel']; return componentViewModelFactory ? componentViewModelFactory.call(componentDefinition, componentParams, { 'element': element, 'templateNodes': originalChildNodes }) : componentParams; // Template-only component } })(); var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' }; ko.bindingHandlers['attr'] = { 'update': function(element, valueAccessor, allBindings) { var value = ko.utils.unwrapObservable(valueAccessor()) || {}; ko.utils.objectForEach(value, function(attrName, attrValue) { attrValue = ko.utils.unwrapObservable(attrValue); // To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely // when someProp is a "no value"-like value (strictly null, false, or undefined) // (because the absence of the "checked" attr is how to mark an element as not checked, etc.) var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined); if (toRemove) element.removeAttribute(attrName); // In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the // HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior, // but instead of figuring out the mode, we'll just set the attribute through the Javascript // property for IE <= 8. if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) { attrName = attrHtmlToJavascriptMap[attrName]; if (toRemove) element.removeAttribute(attrName); else element[attrName] = attrValue; } else if (!toRemove) { element.setAttribute(attrName, attrValue.toString()); } // Treat "name" specially - although you can think of it as an attribute, it also needs // special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333) // Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing // entirely, and there's no strong reason to allow for such casing in HTML. if (attrName === "name") { ko.utils.setElementName(element, toRemove ? "" : attrValue.toString()); } }); } }; (function() { ko.bindingHandlers['checked'] = { 'after': ['value', 'attr'], 'init': function (element, valueAccessor, allBindings) { var checkedValue = ko.pureComputed(function() { // Treat "value" like "checkedValue" when it is included with "checked" binding if (allBindings['has']('checkedValue')) { return ko.utils.unwrapObservable(allBindings.get('checkedValue')); } else if (allBindings['has']('value')) { return ko.utils.unwrapObservable(allBindings.get('value')); } return element.value; }); function updateModel() { // This updates the model value from the view value. // It runs in response to DOM events (click) and changes in checkedValue. var isChecked = element.checked, elemValue = useCheckedValue ? checkedValue() : isChecked; // When we're first setting up this computed, don't change any model state. if (ko.computedContext.isInitial()) { return; } // We can ignore unchecked radio buttons, because some other radio // button will be getting checked, and that one can take care of updating state. if (isRadio && !isChecked) { return; } var modelValue = ko.dependencyDetection.ignore(valueAccessor); if (valueIsArray) { var writableValue = rawValueIsNonArrayObservable ? modelValue.peek() : modelValue; if (oldElemValue !== elemValue) { // When we're responding to the checkedValue changing, and the element is // currently checked, replace the old elem value with the new elem value // in the model array. if (isChecked) { ko.utils.addOrRemoveItem(writableValue, elemValue, true); ko.utils.addOrRemoveItem(writableValue, oldElemValue, false); } oldElemValue = elemValue; } else { // When we're responding to the user having checked/unchecked a checkbox, // add/remove the element value to the model array. ko.utils.addOrRemoveItem(writableValue, elemValue, isChecked); } if (rawValueIsNonArrayObservable && ko.isWriteableObservable(modelValue)) { modelValue(writableValue); } } else { ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'checked', elemValue, true); } }; function updateView() { // This updates the view value from the model value. // It runs in response to changes in the bound (checked) value. var modelValue = ko.utils.unwrapObservable(valueAccessor()); if (valueIsArray) { // When a checkbox is bound to an array, being checked represents its value being present in that array element.checked = ko.utils.arrayIndexOf(modelValue, checkedValue()) >= 0; } else if (isCheckbox) { // When a checkbox is bound to any other value (not an array), being checked represents the value being trueish element.checked = modelValue; } else { // For radio buttons, being checked means that the radio button's value corresponds to the model value element.checked = (checkedValue() === modelValue); } }; var isCheckbox = element.type == "checkbox", isRadio = element.type == "radio"; // Only bind to check boxes and radio buttons if (!isCheckbox && !isRadio) { return; } var rawValue = valueAccessor(), valueIsArray = isCheckbox && (ko.utils.unwrapObservable(rawValue) instanceof Array), rawValueIsNonArrayObservable = !(valueIsArray && rawValue.push && rawValue.splice), oldElemValue = valueIsArray ? checkedValue() : undefined, useCheckedValue = isRadio || valueIsArray; // IE 6 won't allow radio buttons to be selected unless they have a name if (isRadio && !element.name) ko.bindingHandlers['uniqueName']['init'](element, function() { return true }); // Set up two computeds to update the binding: // The first responds to changes in the checkedValue value and to element clicks ko.computed(updateModel, null, { disposeWhenNodeIsRemoved: element }); ko.utils.registerEventHandler(element, "click", updateModel); // The second responds to changes in the model value (the one associated with the checked binding) ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element }); rawValue = undefined; } }; ko.expressionRewriting.twoWayBindings['checked'] = true; ko.bindingHandlers['checkedValue'] = { 'update': function (element, valueAccessor) { element.value = ko.utils.unwrapObservable(valueAccessor()); } }; })();var classesWrittenByBindingKey = '__ko__cssValue'; ko.bindingHandlers['css'] = { 'update': function (element, valueAccessor) { var value = ko.utils.unwrapObservable(valueAccessor()); if (value !== null && typeof value == "object") { ko.utils.objectForEach(value, function(className, shouldHaveClass) { shouldHaveClass = ko.utils.unwrapObservable(shouldHaveClass); ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass); }); } else { value = ko.utils.stringTrim(String(value || '')); // Make sure we don't try to store or set a non-string value ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false); element[classesWrittenByBindingKey] = value; ko.utils.toggleDomNodeCssClass(element, value, true); } } }; ko.bindingHandlers['enable'] = { 'update': function (element, valueAccessor) { var value = ko.utils.unwrapObservable(valueAccessor()); if (value && element.disabled) element.removeAttribute("disabled"); else if ((!value) && (!element.disabled)) element.disabled = true; } }; ko.bindingHandlers['disable'] = { 'update': function (element, valueAccessor) { ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) }); } }; // For certain common events (currently just 'click'), allow a simplified data-binding syntax // e.g. click:handler instead of the usual full-length event:{click:handler} function makeEventHandlerShortcut(eventName) { ko.bindingHandlers[eventName] = { 'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) { var newValueAccessor = function () { var result = {}; result[eventName] = valueAccessor(); return result; }; return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindings, viewModel, bindingContext); } } } ko.bindingHandlers['event'] = { 'init' : function (element, valueAccessor, allBindings, viewModel, bindingContext) { var eventsToHandle = valueAccessor() || {}; ko.utils.objectForEach(eventsToHandle, function(eventName) { if (typeof eventName == "string") { ko.utils.registerEventHandler(element, eventName, function (event) { var handlerReturnValue; var handlerFunction = valueAccessor()[eventName]; if (!handlerFunction) return; try { // Take all the event args, and prefix with the viewmodel var argsForHandler = ko.utils.makeArray(arguments); viewModel = bindingContext['$data']; argsForHandler.unshift(viewModel); handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler); } finally { if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true. if (event.preventDefault) event.preventDefault(); else event.returnValue = false; } } var bubble = allBindings.get(eventName + 'Bubble') !== false; if (!bubble) { event.cancelBubble = true; if (event.stopPropagation) event.stopPropagation(); } }); } }); } }; // "foreach: someExpression" is equivalent to "template: { foreach: someExpression }" // "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }" ko.bindingHandlers['foreach'] = { makeTemplateValueAccessor: function(valueAccessor) { return function() { var modelValue = valueAccessor(), unwrappedValue = ko.utils.peekObservable(modelValue); // Unwrap without setting a dependency here // If unwrappedValue is the array, pass in the wrapped value on its own // The value will be unwrapped and tracked within the template binding // (See https://github.com/SteveSanderson/knockout/issues/523) if ((!unwrappedValue) || typeof unwrappedValue.length == "number") return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance }; // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates ko.utils.unwrapObservable(modelValue); return { 'foreach': unwrappedValue['data'], 'as': unwrappedValue['as'], 'includeDestroyed': unwrappedValue['includeDestroyed'], 'afterAdd': unwrappedValue['afterAdd'], 'beforeRemove': unwrappedValue['beforeRemove'], 'afterRender': unwrappedValue['afterRender'], 'beforeMove': unwrappedValue['beforeMove'], 'afterMove': unwrappedValue['afterMove'], 'templateEngine': ko.nativeTemplateEngine.instance }; }; }, 'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) { return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor)); }, 'update': function(element, valueAccessor, allBindings, viewModel, bindingContext) { return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindings, viewModel, bindingContext); } }; ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings ko.virtualElements.allowedBindings['foreach'] = true; var hasfocusUpdatingProperty = '__ko_hasfocusUpdating'; var hasfocusLastValue = '__ko_hasfocusLastValue'; ko.bindingHandlers['hasfocus'] = { 'init': function(element, valueAccessor, allBindings) { var handleElementFocusChange = function(isFocused) { // Where possible, ignore which event was raised and determine focus state using activeElement, // as this avoids phantom focus/blur events raised when changing tabs in modern browsers. // However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers, // prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus // from calling 'blur()' on the element when it loses focus. // Discussion at https://github.com/SteveSanderson/knockout/pull/352 element[hasfocusUpdatingProperty] = true; var ownerDoc = element.ownerDocument; if ("activeElement" in ownerDoc) { var active; try { active = ownerDoc.activeElement; } catch(e) { // IE9 throws if you access activeElement during page load (see issue #703) active = ownerDoc.body; } isFocused = (active === element); } var modelValue = valueAccessor(); ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'hasfocus', isFocused, true); //cache the latest value, so we can avoid unnecessarily calling focus/blur in the update function element[hasfocusLastValue] = isFocused; element[hasfocusUpdatingProperty] = false; }; var handleElementFocusIn = handleElementFocusChange.bind(null, true); var handleElementFocusOut = handleElementFocusChange.bind(null, false); ko.utils.registerEventHandler(element, "focus", handleElementFocusIn); ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE ko.utils.registerEventHandler(element, "blur", handleElementFocusOut); ko.utils.registerEventHandler(element, "focusout", handleElementFocusOut); // For IE }, 'update': function(element, valueAccessor) { var value = !!ko.utils.unwrapObservable(valueAccessor()); if (!element[hasfocusUpdatingProperty] && element[hasfocusLastValue] !== value) { value ? element.focus() : element.blur(); // In IE, the blur method doesn't always cause the element to lose focus (for example, if the window is not in focus). // Setting focus to the body element does seem to be reliable in IE, but should only be used if we know that the current // element was focused already. if (!value && element[hasfocusLastValue]) { element.ownerDocument.body.focus(); } // For IE, which doesn't reliably fire "focus" or "blur" events synchronously ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]); } } }; ko.expressionRewriting.twoWayBindings['hasfocus'] = true; ko.bindingHandlers['hasFocus'] = ko.bindingHandlers['hasfocus']; // Make "hasFocus" an alias ko.expressionRewriting.twoWayBindings['hasFocus'] = true; ko.bindingHandlers['html'] = { 'init': function() { // Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications) return { 'controlsDescendantBindings': true }; }, 'update': function (element, valueAccessor) { // setHtml will unwrap the value if needed ko.utils.setHtml(element, valueAccessor()); } }; // Makes a binding like with or if function makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) { ko.bindingHandlers[bindingKey] = { 'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) { var didDisplayOnLastUpdate, savedNodes; ko.computed(function() { var rawValue = valueAccessor(), dataValue = ko.utils.unwrapObservable(rawValue), shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue isFirstRender = !savedNodes, needsRefresh = isFirstRender || isWith || (shouldDisplay !== didDisplayOnLastUpdate); if (needsRefresh) { // Save a copy of the inner nodes on the initial update, but only if we have dependencies. if (isFirstRender && ko.computedContext.getDependenciesCount()) { savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */); } if (shouldDisplay) { if (!isFirstRender) { ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(savedNodes)); } ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, rawValue) : bindingContext, element); } else { ko.virtualElements.emptyNode(element); } didDisplayOnLastUpdate = shouldDisplay; } }, null, { disposeWhenNodeIsRemoved: element }); return { 'controlsDescendantBindings': true }; } }; ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings ko.virtualElements.allowedBindings[bindingKey] = true; } // Construct the actual binding handlers makeWithIfBinding('if'); makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */); makeWithIfBinding('with', true /* isWith */, false /* isNot */, function(bindingContext, dataValue) { return bindingContext.createStaticChildContext(dataValue); } ); var captionPlaceholder = {}; ko.bindingHandlers['options'] = { 'init': function(element) { if (ko.utils.tagNameLower(element) !== "select") throw new Error("options binding applies only to SELECT elements"); // Remove all existing <option>s. while (element.length > 0) { element.remove(0); } // Ensures that the binding processor doesn't try to bind the options return { 'controlsDescendantBindings': true }; }, 'update': function (element, valueAccessor, allBindings) { function selectedOptions() { return ko.utils.arrayFilter(element.options, function (node) { return node.selected; }); } var selectWasPreviouslyEmpty = element.length == 0, multiple = element.multiple, previousScrollTop = (!selectWasPreviouslyEmpty && multiple) ? element.scrollTop : null, unwrappedArray = ko.utils.unwrapObservable(valueAccessor()), valueAllowUnset = allBindings.get('valueAllowUnset') && allBindings['has']('value'), includeDestroyed = allBindings.get('optionsIncludeDestroyed'), arrayToDomNodeChildrenOptions = {}, captionValue, filteredArray, previousSelectedValues = []; if (!valueAllowUnset) { if (multiple) { previousSelectedValues = ko.utils.arrayMap(selectedOptions(), ko.selectExtensions.readValue); } else if (element.selectedIndex >= 0) { previousSelectedValues.push(ko.selectExtensions.readValue(element.options[element.selectedIndex])); } } if (unwrappedArray) { if (typeof unwrappedArray.length == "undefined") // Coerce single value into array unwrappedArray = [unwrappedArray]; // Filter out any entries marked as destroyed filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) { return includeDestroyed || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']); }); // If caption is included, add it to the array if (allBindings['has']('optionsCaption')) { captionValue = ko.utils.unwrapObservable(allBindings.get('optionsCaption')); // If caption value is null or undefined, don't show a caption if (captionValue !== null && captionValue !== undefined) { filteredArray.unshift(captionPlaceholder); } } } else { // If a falsy value is provided (e.g. null), we'll simply empty the select element } function applyToObject(object, predicate, defaultValue) { var predicateType = typeof predicate; if (predicateType == "function") // Given a function; run it against the data value return predicate(object); else if (predicateType == "string") // Given a string; treat it as a property name on the data value return object[predicate]; else // Given no optionsText arg; use the data value itself return defaultValue; } // The following functions can run at two different times: // The first is when the whole array is being updated directly from this binding handler. // The second is when an observable value for a specific array entry is updated. // oldOptions will be empty in the first case, but will be filled with the previously generated option in the second. var itemUpdate = false; function optionForArrayItem(arrayEntry, index, oldOptions) { if (oldOptions.length) { previousSelectedValues = !valueAllowUnset && oldOptions[0].selected ? [ ko.selectExtensions.readValue(oldOptions[0]) ] : []; itemUpdate = true; } var option = element.ownerDocument.createElement("option"); if (arrayEntry === captionPlaceholder) { ko.utils.setTextContent(option, allBindings.get('optionsCaption')); ko.selectExtensions.writeValue(option, undefined); } else { // Apply a value to the option element var optionValue = applyToObject(arrayEntry, allBindings.get('optionsValue'), arrayEntry); ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue)); // Apply some text to the option element var optionText = applyToObject(arrayEntry, allBindings.get('optionsText'), optionValue); ko.utils.setTextContent(option, optionText); } return [option]; } // By using a beforeRemove callback, we delay the removal until after new items are added. This fixes a selection // problem in IE<=8 and Firefox. See https://github.com/knockout/knockout/issues/1208 arrayToDomNodeChildrenOptions['beforeRemove'] = function (option) { element.removeChild(option); }; function setSelectionCallback(arrayEntry, newOptions) { if (itemUpdate && valueAllowUnset) { // The model value is authoritative, so make sure its value is the one selected // There is no need to use dependencyDetection.ignore since setDomNodeChildrenFromArrayMapping does so already. ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */); } else if (previousSelectedValues.length) { // IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document. // That's why we first added them without selection. Now it's time to set the selection. var isSelected = ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[0])) >= 0; ko.utils.setOptionNodeSelectionState(newOptions[0], isSelected); // If this option was changed from being selected during a single-item update, notify the change if (itemUpdate && !isSelected) { ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]); } } } var callback = setSelectionCallback; if (allBindings['has']('optionsAfterRender') && typeof allBindings.get('optionsAfterRender') == "function") { callback = function(arrayEntry, newOptions) { setSelectionCallback(arrayEntry, newOptions); ko.dependencyDetection.ignore(allBindings.get('optionsAfterRender'), null, [newOptions[0], arrayEntry !== captionPlaceholder ? arrayEntry : undefined]); } } ko.utils.setDomNodeChildrenFromArrayMapping(element, filteredArray, optionForArrayItem, arrayToDomNodeChildrenOptions, callback); ko.dependencyDetection.ignore(function () { if (valueAllowUnset) { // The model value is authoritative, so make sure its value is the one selected ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */); } else { // Determine if the selection has changed as a result of updating the options list var selectionChanged; if (multiple) { // For a multiple-select box, compare the new selection count to the previous one // But if nothing was selected before, the selection can't have changed selectionChanged = previousSelectedValues.length && selectedOptions().length < previousSelectedValues.length; } else { // For a single-select box, compare the current value to the previous value // But if nothing was selected before or nothing is selected now, just look for a change in selection selectionChanged = (previousSelectedValues.length && element.selectedIndex >= 0) ? (ko.selectExtensions.readValue(element.options[element.selectedIndex]) !== previousSelectedValues[0]) : (previousSelectedValues.length || element.selectedIndex >= 0); } // Ensure consistency between model value and selected option. // If the dropdown was changed so that selection is no longer the same, // notify the value or selectedOptions binding. if (selectionChanged) { ko.utils.triggerEvent(element, "change"); } } }); // Workaround for IE bug ko.utils.ensureSelectElementIsRenderedCorrectly(element); if (previousScrollTop && Math.abs(previousScrollTop - element.scrollTop) > 20) element.scrollTop = previousScrollTop; } }; ko.bindingHandlers['options'].optionValueDomDataKey = ko.utils.domData.nextKey(); ko.bindingHandlers['selectedOptions'] = { 'after': ['options', 'foreach'], 'init': function (element, valueAccessor, allBindings) { ko.utils.registerEventHandler(element, "change", function () { var value = valueAccessor(), valueToWrite = []; ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) { if (node.selected) valueToWrite.push(ko.selectExtensions.readValue(node)); }); ko.expressionRewriting.writeValueToProperty(value, allBindings, 'selectedOptions', valueToWrite); }); }, 'update': function (element, valueAccessor) { if (ko.utils.tagNameLower(element) != "select") throw new Error("values binding applies only to SELECT elements"); var newValue = ko.utils.unwrapObservable(valueAccessor()), previousScrollTop = element.scrollTop; if (newValue && typeof newValue.length == "number") { ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) { var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0; if (node.selected != isSelected) { // This check prevents flashing of the select element in IE ko.utils.setOptionNodeSelectionState(node, isSelected); } }); } element.scrollTop = previousScrollTop; } }; ko.expressionRewriting.twoWayBindings['selectedOptions'] = true; ko.bindingHandlers['style'] = { 'update': function (element, valueAccessor) { var value = ko.utils.unwrapObservable(valueAccessor() || {}); ko.utils.objectForEach(value, function(styleName, styleValue) { styleValue = ko.utils.unwrapObservable(styleValue); if (styleValue === null || styleValue === undefined || styleValue === false) { // Empty string removes the value, whereas null/undefined have no effect styleValue = ""; } element.style[styleName] = styleValue; }); } }; ko.bindingHandlers['submit'] = { 'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) { if (typeof valueAccessor() != "function") throw new Error("The value for a submit binding must be a function"); ko.utils.registerEventHandler(element, "submit", function (event) { var handlerReturnValue; var value = valueAccessor(); try { handlerReturnValue = value.call(bindingContext['$data'], element); } finally { if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true. if (event.preventDefault) event.preventDefault(); else event.returnValue = false; } } }); } }; ko.bindingHandlers['text'] = { 'init': function() { // Prevent binding on the dynamically-injected text node (as developers are unlikely to expect that, and it has security implications). // It should also make things faster, as we no longer have to consider whether the text node might be bindable. return { 'controlsDescendantBindings': true }; }, 'update': function (element, valueAccessor) { ko.utils.setTextContent(element, valueAccessor()); } }; ko.virtualElements.allowedBindings['text'] = true; (function () { if (window && window.navigator) { var parseVersion = function (matches) { if (matches) { return parseFloat(matches[1]); } }; // Detect various browser versions because some old versions don't fully support the 'input' event var operaVersion = window.opera && window.opera.version && parseInt(window.opera.version()), userAgent = window.navigator.userAgent, safariVersion = parseVersion(userAgent.match(/^(?:(?!chrome).)*version\/([^ ]*) safari/i)), firefoxVersion = parseVersion(userAgent.match(/Firefox\/([^ ]*)/)); } // IE 8 and 9 have bugs that prevent the normal events from firing when the value changes. // But it does fire the 'selectionchange' event on many of those, presumably because the // cursor is moving and that counts as the selection changing. The 'selectionchange' event is // fired at the document level only and doesn't directly indicate which element changed. We // set up just one event handler for the document and use 'activeElement' to determine which // element was changed. if (ko.utils.ieVersion < 10) { var selectionChangeRegisteredName = ko.utils.domData.nextKey(), selectionChangeHandlerName = ko.utils.domData.nextKey(); var selectionChangeHandler = function(event) { var target = this.activeElement, handler = target && ko.utils.domData.get(target, selectionChangeHandlerName); if (handler) { handler(event); } }; var registerForSelectionChangeEvent = function (element, handler) { var ownerDoc = element.ownerDocument; if (!ko.utils.domData.get(ownerDoc, selectionChangeRegisteredName)) { ko.utils.domData.set(ownerDoc, selectionChangeRegisteredName, true); ko.utils.registerEventHandler(ownerDoc, 'selectionchange', selectionChangeHandler); } ko.utils.domData.set(element, selectionChangeHandlerName, handler); }; } ko.bindingHandlers['textInput'] = { 'init': function (element, valueAccessor, allBindings) { var previousElementValue = element.value, timeoutHandle, elementValueBeforeEvent; var updateModel = function (event) { clearTimeout(timeoutHandle); elementValueBeforeEvent = timeoutHandle = undefined; var elementValue = element.value; if (previousElementValue !== elementValue) { // Provide a way for tests to know exactly which event was processed if (DEBUG && event) element['_ko_textInputProcessedEvent'] = event.type; previousElementValue = elementValue; ko.expressionRewriting.writeValueToProperty(valueAccessor(), allBindings, 'textInput', elementValue); } }; var deferUpdateModel = function (event) { if (!timeoutHandle) { // The elementValueBeforeEvent variable is set *only* during the brief gap between an // event firing and the updateModel function running. This allows us to ignore model // updates that are from the previous state of the element, usually due to techniques // such as rateLimit. Such updates, if not ignored, can cause keystrokes to be lost. elementValueBeforeEvent = element.value; var handler = DEBUG ? updateModel.bind(element, {type: event.type}) : updateModel; timeoutHandle = ko.utils.setTimeout(handler, 4); } }; // IE9 will mess up the DOM if you handle events synchronously which results in DOM changes (such as other bindings); // so we'll make sure all updates are asynchronous var ieUpdateModel = ko.utils.ieVersion == 9 ? deferUpdateModel : updateModel; var updateView = function () { var modelValue = ko.utils.unwrapObservable(valueAccessor()); if (modelValue === null || modelValue === undefined) { modelValue = ''; } if (elementValueBeforeEvent !== undefined && modelValue === elementValueBeforeEvent) { ko.utils.setTimeout(updateView, 4); return; } // Update the element only if the element and model are different. On some browsers, updating the value // will move the cursor to the end of the input, which would be bad while the user is typing. if (element.value !== modelValue) { previousElementValue = modelValue; // Make sure we ignore events (propertychange) that result from updating the value element.value = modelValue; } }; var onEvent = function (event, handler) { ko.utils.registerEventHandler(element, event, handler); }; if (DEBUG && ko.bindingHandlers['textInput']['_forceUpdateOn']) { // Provide a way for tests to specify exactly which events are bound ko.utils.arrayForEach(ko.bindingHandlers['textInput']['_forceUpdateOn'], function(eventName) { if (eventName.slice(0,5) == 'after') { onEvent(eventName.slice(5), deferUpdateModel); } else { onEvent(eventName, updateModel); } }); } else { if (ko.utils.ieVersion < 10) { // Internet Explorer <= 8 doesn't support the 'input' event, but does include 'propertychange' that fires whenever // any property of an element changes. Unlike 'input', it also fires if a property is changed from JavaScript code, // but that's an acceptable compromise for this binding. IE 9 does support 'input', but since it doesn't fire it // when using autocomplete, we'll use 'propertychange' for it also. onEvent('propertychange', function(event) { if (event.propertyName === 'value') { ieUpdateModel(event); } }); if (ko.utils.ieVersion == 8) { // IE 8 has a bug where it fails to fire 'propertychange' on the first update following a value change from // JavaScript code. It also doesn't fire if you clear the entire value. To fix this, we bind to the following // events too. onEvent('keyup', updateModel); // A single keystoke onEvent('keydown', updateModel); // The first character when a key is held down } if (ko.utils.ieVersion >= 8) { // Internet Explorer 9 doesn't fire the 'input' event when deleting text, including using // the backspace, delete, or ctrl-x keys, clicking the 'x' to clear the input, dragging text // out of the field, and cutting or deleting text using the context menu. 'selectionchange' // can detect all of those except dragging text out of the field, for which we use 'dragend'. // These are also needed in IE8 because of the bug described above. registerForSelectionChangeEvent(element, ieUpdateModel); // 'selectionchange' covers cut, paste, drop, delete, etc. onEvent('dragend', deferUpdateModel); } } else { // All other supported browsers support the 'input' event, which fires whenever the content of the element is changed // through the user interface. onEvent('input', updateModel); if (safariVersion < 5 && ko.utils.tagNameLower(element) === "textarea") { // Safari <5 doesn't fire the 'input' event for <textarea> elements (it does fire 'textInput' // but only when typing). So we'll just catch as much as we can with keydown, cut, and paste. onEvent('keydown', deferUpdateModel); onEvent('paste', deferUpdateModel); onEvent('cut', deferUpdateModel); } else if (operaVersion < 11) { // Opera 10 doesn't always fire the 'input' event for cut, paste, undo & drop operations. // We can try to catch some of those using 'keydown'. onEvent('keydown', deferUpdateModel); } else if (firefoxVersion < 4.0) { // Firefox <= 3.6 doesn't fire the 'input' event when text is filled in through autocomplete onEvent('DOMAutoComplete', updateModel); // Firefox <=3.5 doesn't fire the 'input' event when text is dropped into the input. onEvent('dragdrop', updateModel); // <3.5 onEvent('drop', updateModel); // 3.5 } } } // Bind to the change event so that we can catch programmatic updates of the value that fire this event. onEvent('change', updateModel); ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element }); } }; ko.expressionRewriting.twoWayBindings['textInput'] = true; // textinput is an alias for textInput ko.bindingHandlers['textinput'] = { // preprocess is the only way to set up a full alias 'preprocess': function (value, name, addBinding) { addBinding('textInput', value); } }; })();ko.bindingHandlers['uniqueName'] = { 'init': function (element, valueAccessor) { if (valueAccessor()) { var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex); ko.utils.setElementName(element, name); } } }; ko.bindingHandlers['uniqueName'].currentIndex = 0; ko.bindingHandlers['value'] = { 'after': ['options', 'foreach'], 'init': function (element, valueAccessor, allBindings) { // If the value binding is placed on a radio/checkbox, then just pass through to checkedValue and quit if (element.tagName.toLowerCase() == "input" && (element.type == "checkbox" || element.type == "radio")) { ko.applyBindingAccessorsToNode(element, { 'checkedValue': valueAccessor }); return; } // Always catch "change" event; possibly other events too if asked var eventsToCatch = ["change"]; var requestedEventsToCatch = allBindings.get("valueUpdate"); var propertyChangedFired = false; var elementValueBeforeEvent = null; if (requestedEventsToCatch) { if (typeof requestedEventsToCatch == "string") // Allow both individual event names, and arrays of event names requestedEventsToCatch = [requestedEventsToCatch]; ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch); eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch); } var valueUpdateHandler = function() { elementValueBeforeEvent = null; propertyChangedFired = false; var modelValue = valueAccessor(); var elementValue = ko.selectExtensions.readValue(element); ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'value', elementValue); } // Workaround for https://github.com/SteveSanderson/knockout/issues/122 // IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == "input" && element.type == "text" && element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off"); if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) { ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true }); ko.utils.registerEventHandler(element, "focus", function () { propertyChangedFired = false }); ko.utils.registerEventHandler(element, "blur", function() { if (propertyChangedFired) { valueUpdateHandler(); } }); } ko.utils.arrayForEach(eventsToCatch, function(eventName) { // The syntax "after<eventname>" means "run the handler asynchronously after the event" // This is useful, for example, to catch "keydown" events after the browser has updated the control // (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event) var handler = valueUpdateHandler; if (ko.utils.stringStartsWith(eventName, "after")) { handler = function() { // The elementValueBeforeEvent variable is non-null *only* during the brief gap between // a keyX event firing and the valueUpdateHandler running, which is scheduled to happen // at the earliest asynchronous opportunity. We store this temporary information so that // if, between keyX and valueUpdateHandler, the underlying model value changes separately, // we can overwrite that model value change with the value the user just typed. Otherwise, // techniques like rateLimit can trigger model changes at critical moments that will // override the user's inputs, causing keystrokes to be lost. elementValueBeforeEvent = ko.selectExtensions.readValue(element); ko.utils.setTimeout(valueUpdateHandler, 0); }; eventName = eventName.substring("after".length); } ko.utils.registerEventHandler(element, eventName, handler); }); var updateFromModel = function () { var newValue = ko.utils.unwrapObservable(valueAccessor()); var elementValue = ko.selectExtensions.readValue(element); if (elementValueBeforeEvent !== null && newValue === elementValueBeforeEvent) { ko.utils.setTimeout(updateFromModel, 0); return; } var valueHasChanged = (newValue !== elementValue); if (valueHasChanged) { if (ko.utils.tagNameLower(element) === "select") { var allowUnset = allBindings.get('valueAllowUnset'); var applyValueAction = function () { ko.selectExtensions.writeValue(element, newValue, allowUnset); }; applyValueAction(); if (!allowUnset && newValue !== ko.selectExtensions.readValue(element)) { // If you try to set a model value that can't be represented in an already-populated dropdown, reject that change, // because you're not allowed to have a model value that disagrees with a visible UI selection. ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]); } else { // Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread // right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread // to apply the value as well. ko.utils.setTimeout(applyValueAction, 0); } } else { ko.selectExtensions.writeValue(element, newValue); } } }; ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element }); }, 'update': function() {} // Keep for backwards compatibility with code that may have wrapped value binding }; ko.expressionRewriting.twoWayBindings['value'] = true; ko.bindingHandlers['visible'] = { 'update': function (element, valueAccessor) { var value = ko.utils.unwrapObservable(valueAccessor()); var isCurrentlyVisible = !(element.style.display == "none"); if (value && !isCurrentlyVisible) element.style.display = ""; else if ((!value) && isCurrentlyVisible) element.style.display = "none"; } }; // 'click' is just a shorthand for the usual full-length event:{click:handler} makeEventHandlerShortcut('click'); // If you want to make a custom template engine, // // [1] Inherit from this class (like ko.nativeTemplateEngine does) // [2] Override 'renderTemplateSource', supplying a function with this signature: // // function (templateSource, bindingContext, options) { // // - templateSource.text() is the text of the template you should render // // - bindingContext.$data is the data you should pass into the template // // - you might also want to make bindingContext.$parent, bindingContext.$parents, // // and bindingContext.$root available in the template too // // - options gives you access to any other properties set on "data-bind: { template: options }" // // - templateDocument is the document object of the template // // // // Return value: an array of DOM nodes // } // // [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature: // // function (script) { // // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result" // // For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }' // } // // This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables. // If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does) // and then you don't need to override 'createJavaScriptEvaluatorBlock'. ko.templateEngine = function () { }; ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) { throw new Error("Override renderTemplateSource"); }; ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) { throw new Error("Override createJavaScriptEvaluatorBlock"); }; ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) { // Named template if (typeof template == "string") { templateDocument = templateDocument || document; var elem = templateDocument.getElementById(template); if (!elem) throw new Error("Cannot find template with ID " + template); return new ko.templateSources.domElement(elem); } else if ((template.nodeType == 1) || (template.nodeType == 8)) { // Anonymous template return new ko.templateSources.anonymousTemplate(template); } else throw new Error("Unknown template type: " + template); }; ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) { var templateSource = this['makeTemplateSource'](template, templateDocument); return this['renderTemplateSource'](templateSource, bindingContext, options, templateDocument); }; ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) { // Skip rewriting if requested if (this['allowTemplateRewriting'] === false) return true; return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten"); }; ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) { var templateSource = this['makeTemplateSource'](template, templateDocument); var rewritten = rewriterCallback(templateSource['text']()); templateSource['text'](rewritten); templateSource['data']("isRewritten", true); }; ko.exportSymbol('templateEngine', ko.templateEngine); ko.templateRewriting = (function () { var memoizeDataBindingAttributeSyntaxRegex = /(<([a-z]+\d*)(?:\s+(?!data-bind\s*=\s*)[a-z0-9\-]+(?:=(?:\"[^\"]*\"|\'[^\']*\'|[^>]*))?)*\s+)data-bind\s*=\s*(["'])([\s\S]*?)\3/gi; var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g; function validateDataBindValuesForRewriting(keyValueArray) { var allValidators = ko.expressionRewriting.bindingRewriteValidators; for (var i = 0; i < keyValueArray.length; i++) { var key = keyValueArray[i]['key']; if (allValidators.hasOwnProperty(key)) { var validator = allValidators[key]; if (typeof validator === "function") { var possibleErrorMessage = validator(keyValueArray[i]['value']); if (possibleErrorMessage) throw new Error(possibleErrorMessage); } else if (!validator) { throw new Error("This template engine does not support the '" + key + "' binding within its templates"); } } } } function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, nodeName, templateEngine) { var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue); validateDataBindValuesForRewriting(dataBindKeyValueArray); var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray, {'valueAccessors':true}); // For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional // anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this // extra indirection. var applyBindingsToNextSiblingScript = "ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()},'" + nodeName.toLowerCase() + "')"; return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain; } return { ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) { if (!templateEngine['isTemplateRewritten'](template, templateDocument)) templateEngine['rewriteTemplate'](template, function (htmlString) { return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine); }, templateDocument); }, memoizeBindingAttributeSyntax: function (htmlString, templateEngine) { return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () { return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[4], /* tagToRetain: */ arguments[1], /* nodeName: */ arguments[2], templateEngine); }).replace(memoizeVirtualContainerBindingSyntaxRegex, function() { return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", /* nodeName: */ "#comment", templateEngine); }); }, applyMemoizedBindingsToNextSibling: function (bindings, nodeName) { return ko.memoization.memoize(function (domNode, bindingContext) { var nodeToBind = domNode.nextSibling; if (nodeToBind && nodeToBind.nodeName.toLowerCase() === nodeName) { ko.applyBindingAccessorsToNode(nodeToBind, bindings, bindingContext); } }); } } })(); // Exported only because it has to be referenced by string lookup from within rewritten template ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling); (function() { // A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving // logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.) // // Two are provided by default: // 1. ko.templateSources.domElement - reads/writes the text content of an arbitrary DOM element // 2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but // without reading/writing the actual element text content, since it will be overwritten // with the rendered template output. // You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements. // Template sources need to have the following functions: // text() - returns the template text from your storage location // text(value) - writes the supplied template text to your storage location // data(key) - reads values stored using data(key, value) - see below // data(key, value) - associates "value" with this template and the key "key". Is used to store information like "isRewritten". // // Optionally, template sources can also have the following functions: // nodes() - returns a DOM element containing the nodes of this template, where available // nodes(value) - writes the given DOM element to your storage location // If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text() // for improved speed. However, all templateSources must supply text() even if they don't supply nodes(). // // Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were // using and overriding "makeTemplateSource" to return an instance of your custom template source. ko.templateSources = {}; // ---- ko.templateSources.domElement ----- // template types var templateScript = 1, templateTextArea = 2, templateTemplate = 3, templateElement = 4; ko.templateSources.domElement = function(element) { this.domElement = element; if (element) { var tagNameLower = ko.utils.tagNameLower(element); this.templateType = tagNameLower === "script" ? templateScript : tagNameLower === "textarea" ? templateTextArea : // For browsers with proper <template> element support, where the .content property gives a document fragment tagNameLower == "template" && element.content && element.content.nodeType === 11 ? templateTemplate : templateElement; } } ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) { var elemContentsProperty = this.templateType === templateScript ? "text" : this.templateType === templateTextArea ? "value" : "innerHTML"; if (arguments.length == 0) { return this.domElement[elemContentsProperty]; } else { var valueToWrite = arguments[0]; if (elemContentsProperty === "innerHTML") ko.utils.setHtml(this.domElement, valueToWrite); else this.domElement[elemContentsProperty] = valueToWrite; } }; var dataDomDataPrefix = ko.utils.domData.nextKey() + "_"; ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) { if (arguments.length === 1) { return ko.utils.domData.get(this.domElement, dataDomDataPrefix + key); } else { ko.utils.domData.set(this.domElement, dataDomDataPrefix + key, arguments[1]); } }; var templatesDomDataKey = ko.utils.domData.nextKey(); function getTemplateDomData(element) { return ko.utils.domData.get(element, templatesDomDataKey) || {}; } function setTemplateDomData(element, data) { ko.utils.domData.set(element, templatesDomDataKey, data); } ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) { var element = this.domElement; if (arguments.length == 0) { var templateData = getTemplateDomData(element), containerData = templateData.containerData; return containerData || ( this.templateType === templateTemplate ? element.content : this.templateType === templateElement ? element : undefined); } else { var valueToWrite = arguments[0]; setTemplateDomData(element, {containerData: valueToWrite}); } }; // ---- ko.templateSources.anonymousTemplate ----- // Anonymous templates are normally saved/retrieved as DOM nodes through "nodes". // For compatibility, you can also read "text"; it will be serialized from the nodes on demand. // Writing to "text" is still supported, but then the template data will not be available as DOM nodes. ko.templateSources.anonymousTemplate = function(element) { this.domElement = element; } ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement(); ko.templateSources.anonymousTemplate.prototype.constructor = ko.templateSources.anonymousTemplate; ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) { if (arguments.length == 0) { var templateData = getTemplateDomData(this.domElement); if (templateData.textData === undefined && templateData.containerData) templateData.textData = templateData.containerData.innerHTML; return templateData.textData; } else { var valueToWrite = arguments[0]; setTemplateDomData(this.domElement, {textData: valueToWrite}); } }; ko.exportSymbol('templateSources', ko.templateSources); ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement); ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate); })(); (function () { var _templateEngine; ko.setTemplateEngine = function (templateEngine) { if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine)) throw new Error("templateEngine must inherit from ko.templateEngine"); _templateEngine = templateEngine; } function invokeForEachNodeInContinuousRange(firstNode, lastNode, action) { var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode); while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) { nextInQueue = ko.virtualElements.nextSibling(node); action(node, nextInQueue); } } function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) { // To be used on any nodes that have been rendered by a template and have been inserted into some parent element // Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because // the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense, // (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings // (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting) if (continuousNodeArray.length) { var firstNode = continuousNodeArray[0], lastNode = continuousNodeArray[continuousNodeArray.length - 1], parentNode = firstNode.parentNode, provider = ko.bindingProvider['instance'], preprocessNode = provider['preprocessNode']; if (preprocessNode) { invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node, nextNodeInRange) { var nodePreviousSibling = node.previousSibling; var newNodes = preprocessNode.call(provider, node); if (newNodes) { if (node === firstNode) firstNode = newNodes[0] || nextNodeInRange; if (node === lastNode) lastNode = newNodes[newNodes.length - 1] || nodePreviousSibling; } }); // Because preprocessNode can change the nodes, including the first and last nodes, update continuousNodeArray to match. // We need the full set, including inner nodes, because the unmemoize step might remove the first node (and so the real // first node needs to be in the array). continuousNodeArray.length = 0; if (!firstNode) { // preprocessNode might have removed all the nodes, in which case there's nothing left to do return; } if (firstNode === lastNode) { continuousNodeArray.push(firstNode); } else { continuousNodeArray.push(firstNode, lastNode); ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode); } } // Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind) // whereas a regular applyBindings won't introduce new memoized nodes invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) { if (node.nodeType === 1 || node.nodeType === 8) ko.applyBindings(bindingContext, node); }); invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) { if (node.nodeType === 1 || node.nodeType === 8) ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]); }); // Make sure any changes done by applyBindings or unmemoize are reflected in the array ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode); } } function getFirstNodeFromPossibleArray(nodeOrNodeArray) { return nodeOrNodeArray.nodeType ? nodeOrNodeArray : nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0] : null; } function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) { options = options || {}; var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray); var templateDocument = (firstTargetNode || template || {}).ownerDocument; var templateEngineToUse = (options['templateEngine'] || _templateEngine); ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument); var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument); // Loosely check result is an array of DOM nodes if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number")) throw new Error("Template engine must return an array of DOM nodes"); var haveAddedNodesToParent = false; switch (renderMode) { case "replaceChildren": ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray); haveAddedNodesToParent = true; break; case "replaceNode": ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray); haveAddedNodesToParent = true; break; case "ignoreTargetNode": break; default: throw new Error("Unknown renderMode: " + renderMode); } if (haveAddedNodesToParent) { activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext); if (options['afterRender']) ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext['$data']]); } return renderedNodesArray; } function resolveTemplateName(template, data, context) { // The template can be specified as: if (ko.isObservable(template)) { // 1. An observable, with string value return template(); } else if (typeof template === 'function') { // 2. A function of (data, context) returning a string return template(data, context); } else { // 3. A string return template; } } ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) { options = options || {}; if ((options['templateEngine'] || _templateEngine) == undefined) throw new Error("Set a template engine before calling renderTemplate"); renderMode = renderMode || "replaceChildren"; if (targetNodeOrNodeArray) { var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray); var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation) var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode; return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes function () { // Ensure we've got a proper binding context to work with var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext)) ? dataOrBindingContext : new ko.bindingContext(dataOrBindingContext, null, null, null, { "exportDependencies": true }); var templateName = resolveTemplateName(template, bindingContext['$data'], bindingContext), renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options); if (renderMode == "replaceNode") { targetNodeOrNodeArray = renderedNodesArray; firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray); } }, null, { disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved } ); } else { // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node return ko.memoization.memoize(function (domNode) { ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode"); }); } }; ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) { // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter. var arrayItemContext; // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode var executeTemplateForArrayItem = function (arrayValue, index) { // Support selecting template as a function of the data being rendered arrayItemContext = parentBindingContext['createChildContext'](arrayValue, options['as'], function(context) { context['$index'] = index; }); var templateName = resolveTemplateName(template, arrayValue, arrayItemContext); return executeTemplate(null, "ignoreTargetNode", templateName, arrayItemContext, options); } // This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode var activateBindingsCallback = function(arrayValue, addedNodesArray, index) { activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext); if (options['afterRender']) options['afterRender'](addedNodesArray, arrayValue); // release the "cache" variable, so that it can be collected by // the GC when its value isn't used from within the bindings anymore. arrayItemContext = null; }; return ko.dependentObservable(function () { var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || []; if (typeof unwrappedArray.length == "undefined") // Coerce single value into array unwrappedArray = [unwrappedArray]; // Filter out any entries marked as destroyed var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) { return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']); }); // Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function). // If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping. ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback]); }, null, { disposeWhenNodeIsRemoved: targetNode }); }; var templateComputedDomDataKey = ko.utils.domData.nextKey(); function disposeOldComputedAndStoreNewOne(element, newComputed) { var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey); if (oldComputed && (typeof(oldComputed.dispose) == 'function')) oldComputed.dispose(); ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && newComputed.isActive()) ? newComputed : undefined); } ko.bindingHandlers['template'] = { 'init': function(element, valueAccessor) { // Support anonymous templates var bindingValue = ko.utils.unwrapObservable(valueAccessor()); if (typeof bindingValue == "string" || bindingValue['name']) { // It's a named template - clear the element ko.virtualElements.emptyNode(element); } else if ('nodes' in bindingValue) { // We've been given an array of DOM nodes. Save them as the template source. // There is no known use case for the node array being an observable array (if the output // varies, put that behavior *into* your template - that's what templates are for), and // the implementation would be a mess, so assert that it's not observable. var nodes = bindingValue['nodes'] || []; if (ko.isObservable(nodes)) { throw new Error('The "nodes" option must be a plain, non-observable array.'); } var container = ko.utils.moveCleanedNodesToContainerElement(nodes); // This also removes the nodes from their current parent new ko.templateSources.anonymousTemplate(element)['nodes'](container); } else { // It's an anonymous template - store the element contents, then clear the element var templateNodes = ko.virtualElements.childNodes(element), container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent new ko.templateSources.anonymousTemplate(element)['nodes'](container); } return { 'controlsDescendantBindings': true }; }, 'update': function (element, valueAccessor, allBindings, viewModel, bindingContext) { var value = valueAccessor(), options = ko.utils.unwrapObservable(value), shouldDisplay = true, templateComputed = null, templateName; if (typeof options == "string") { templateName = value; options = {}; } else { templateName = options['name']; // Support "if"/"ifnot" conditions if ('if' in options) shouldDisplay = ko.utils.unwrapObservable(options['if']); if (shouldDisplay && 'ifnot' in options) shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']); } if ('foreach' in options) { // Render once for each data point (treating data set as empty if shouldDisplay==false) var dataArray = (shouldDisplay && options['foreach']) || []; templateComputed = ko.renderTemplateForEach(templateName || element, dataArray, options, element, bindingContext); } else if (!shouldDisplay) { ko.virtualElements.emptyNode(element); } else { // Render once for this single data point (or use the viewModel if no data was provided) var innerBindingContext = ('data' in options) ? bindingContext.createStaticChildContext(options['data'], options['as']) : // Given an explitit 'data' value, we create a child binding context for it bindingContext; // Given no explicit 'data' value, we retain the same binding context templateComputed = ko.renderTemplate(templateName || element, innerBindingContext, options, element); } // It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?) disposeOldComputedAndStoreNewOne(element, templateComputed); } }; // Anonymous templates can't be rewritten. Give a nice error message if you try to do it. ko.expressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) { var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue); if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown']) return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting) if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name")) return null; // Named templates can be rewritten, so return "no error" return "This template engine does not support anonymous templates nested within its templates"; }; ko.virtualElements.allowedBindings['template'] = true; })(); ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine); ko.exportSymbol('renderTemplate', ko.renderTemplate); // Go through the items that have been added and deleted and try to find matches between them. ko.utils.findMovesInArrayComparison = function (left, right, limitFailedCompares) { if (left.length && right.length) { var failedCompares, l, r, leftItem, rightItem; for (failedCompares = l = 0; (!limitFailedCompares || failedCompares < limitFailedCompares) && (leftItem = left[l]); ++l) { for (r = 0; rightItem = right[r]; ++r) { if (leftItem['value'] === rightItem['value']) { leftItem['moved'] = rightItem['index']; rightItem['moved'] = leftItem['index']; right.splice(r, 1); // This item is marked as moved; so remove it from right list failedCompares = r = 0; // Reset failed compares count because we're checking for consecutive failures break; } } failedCompares += r; } } }; ko.utils.compareArrays = (function () { var statusNotInOld = 'added', statusNotInNew = 'deleted'; // Simple calculation based on Levenshtein distance. function compareArrays(oldArray, newArray, options) { // For backward compatibility, if the third arg is actually a bool, interpret // it as the old parameter 'dontLimitMoves'. Newer code should use { dontLimitMoves: true }. options = (typeof options === 'boolean') ? { 'dontLimitMoves': options } : (options || {}); oldArray = oldArray || []; newArray = newArray || []; if (oldArray.length < newArray.length) return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, options); else return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, options); } function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, options) { var myMin = Math.min, myMax = Math.max, editDistanceMatrix = [], smlIndex, smlIndexMax = smlArray.length, bigIndex, bigIndexMax = bigArray.length, compareRange = (bigIndexMax - smlIndexMax) || 1, maxDistance = smlIndexMax + bigIndexMax + 1, thisRow, lastRow, bigIndexMaxForRow, bigIndexMinForRow; for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) { lastRow = thisRow; editDistanceMatrix.push(thisRow = []); bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange); bigIndexMinForRow = myMax(0, smlIndex - 1); for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) { if (!bigIndex) thisRow[bigIndex] = smlIndex + 1; else if (!smlIndex) // Top row - transform empty array into new array via additions thisRow[bigIndex] = bigIndex + 1; else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1]) thisRow[bigIndex] = lastRow[bigIndex - 1]; // copy value (no edit) else { var northDistance = lastRow[bigIndex] || maxDistance; // not in big (deletion) var westDistance = thisRow[bigIndex - 1] || maxDistance; // not in small (addition) thisRow[bigIndex] = myMin(northDistance, westDistance) + 1; } } } var editScript = [], meMinusOne, notInSml = [], notInBig = []; for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) { meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1; if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex-1]) { notInSml.push(editScript[editScript.length] = { // added 'status': statusNotInSml, 'value': bigArray[--bigIndex], 'index': bigIndex }); } else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) { notInBig.push(editScript[editScript.length] = { // deleted 'status': statusNotInBig, 'value': smlArray[--smlIndex], 'index': smlIndex }); } else { --bigIndex; --smlIndex; if (!options['sparse']) { editScript.push({ 'status': "retained", 'value': bigArray[bigIndex] }); } } } // Set a limit on the number of consecutive non-matching comparisons; having it a multiple of // smlIndexMax keeps the time complexity of this algorithm linear. ko.utils.findMovesInArrayComparison(notInBig, notInSml, !options['dontLimitMoves'] && smlIndexMax * 10); return editScript.reverse(); } return compareArrays; })(); ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays); (function () { // Objective: // * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes, // map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node // * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node // so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we // previously mapped - retain those nodes, and just insert/delete other ones // "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node // You can use this, for example, to activate bindings on those nodes. function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) { // Map this array value inside a dependentObservable so we re-map when any dependency changes var mappedNodes = []; var dependentObservable = ko.dependentObservable(function() { var newMappedNodes = mapping(valueToMap, index, ko.utils.fixUpContinuousNodeArray(mappedNodes, containerNode)) || []; // On subsequent evaluations, just replace the previously-inserted DOM nodes if (mappedNodes.length > 0) { ko.utils.replaceDomNodes(mappedNodes, newMappedNodes); if (callbackAfterAddingNodes) ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]); } // Replace the contents of the mappedNodes array, thereby updating the record // of which nodes would be deleted if valueToMap was itself later removed mappedNodes.length = 0; ko.utils.arrayPushAll(mappedNodes, newMappedNodes); }, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function() { return !ko.utils.anyDomNodeIsAttachedToDocument(mappedNodes); } }); return { mappedNodes : mappedNodes, dependentObservable : (dependentObservable.isActive() ? dependentObservable : undefined) }; } var lastMappingResultDomDataKey = ko.utils.domData.nextKey(), deletedItemDummyValue = ko.utils.domData.nextKey(); ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) { // Compare the provided array against the previous one array = array || []; options = options || {}; var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined; var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || []; var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; }); var editScript = ko.utils.compareArrays(lastArray, array, options['dontLimitMoves']); // Build the new mapping result var newMappingResult = []; var lastMappingResultIndex = 0; var newMappingResultIndex = 0; var nodesToDelete = []; var itemsToProcess = []; var itemsForBeforeRemoveCallbacks = []; var itemsForMoveCallbacks = []; var itemsForAfterAddCallbacks = []; var mapData; function itemMovedOrRetained(editScriptIndex, oldPosition) { mapData = lastMappingResult[oldPosition]; if (newMappingResultIndex !== oldPosition) itemsForMoveCallbacks[editScriptIndex] = mapData; // Since updating the index might change the nodes, do so before calling fixUpContinuousNodeArray mapData.indexObservable(newMappingResultIndex++); ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode); newMappingResult.push(mapData); itemsToProcess.push(mapData); } function callCallback(callback, items) { if (callback) { for (var i = 0, n = items.length; i < n; i++) { if (items[i]) { ko.utils.arrayForEach(items[i].mappedNodes, function(node) { callback(node, i, items[i].arrayEntry); }); } } } } for (var i = 0, editScriptItem, movedIndex; editScriptItem = editScript[i]; i++) { movedIndex = editScriptItem['moved']; switch (editScriptItem['status']) { case "deleted": if (movedIndex === undefined) { mapData = lastMappingResult[lastMappingResultIndex]; // Stop tracking changes to the mapping for these nodes if (mapData.dependentObservable) { mapData.dependentObservable.dispose(); mapData.dependentObservable = undefined; } // Queue these nodes for later removal if (ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode).length) { if (options['beforeRemove']) { newMappingResult.push(mapData); itemsToProcess.push(mapData); if (mapData.arrayEntry === deletedItemDummyValue) { mapData = null; } else { itemsForBeforeRemoveCallbacks[i] = mapData; } } if (mapData) { nodesToDelete.push.apply(nodesToDelete, mapData.mappedNodes); } } } lastMappingResultIndex++; break; case "retained": itemMovedOrRetained(i, lastMappingResultIndex++); break; case "added": if (movedIndex !== undefined) { itemMovedOrRetained(i, movedIndex); } else { mapData = { arrayEntry: editScriptItem['value'], indexObservable: ko.observable(newMappingResultIndex++) }; newMappingResult.push(mapData); itemsToProcess.push(mapData); if (!isFirstExecution) itemsForAfterAddCallbacks[i] = mapData; } break; } } // Store a copy of the array items we just considered so we can difference it next time ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult); // Call beforeMove first before any changes have been made to the DOM callCallback(options['beforeMove'], itemsForMoveCallbacks); // Next remove nodes for deleted items (or just clean if there's a beforeRemove callback) ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode); // Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback) for (var i = 0, nextNode = ko.virtualElements.firstChild(domNode), lastNode, node; mapData = itemsToProcess[i]; i++) { // Get nodes for newly added items if (!mapData.mappedNodes) ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable)); // Put nodes in the right place if they aren't there already for (var j = 0; node = mapData.mappedNodes[j]; nextNode = node.nextSibling, lastNode = node, j++) { if (node !== nextNode) ko.virtualElements.insertAfter(domNode, node, lastNode); } // Run the callbacks for newly added nodes (for example, to apply bindings, etc.) if (!mapData.initialized && callbackAfterAddingNodes) { callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable); mapData.initialized = true; } } // If there's a beforeRemove callback, call it after reordering. // Note that we assume that the beforeRemove callback will usually be used to remove the nodes using // some sort of animation, which is why we first reorder the nodes that will be removed. If the // callback instead removes the nodes right away, it would be more efficient to skip reordering them. // Perhaps we'll make that change in the future if this scenario becomes more common. callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks); // Replace the stored values of deleted items with a dummy value. This provides two benefits: it marks this item // as already "removed" so we won't call beforeRemove for it again, and it ensures that the item won't match up // with an actual item in the array and appear as "retained" or "moved". for (i = 0; i < itemsForBeforeRemoveCallbacks.length; ++i) { if (itemsForBeforeRemoveCallbacks[i]) { itemsForBeforeRemoveCallbacks[i].arrayEntry = deletedItemDummyValue; } } // Finally call afterMove and afterAdd callbacks callCallback(options['afterMove'], itemsForMoveCallbacks); callCallback(options['afterAdd'], itemsForAfterAddCallbacks); } })(); ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping); ko.nativeTemplateEngine = function () { this['allowTemplateRewriting'] = false; } ko.nativeTemplateEngine.prototype = new ko.templateEngine(); ko.nativeTemplateEngine.prototype.constructor = ko.nativeTemplateEngine; ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) { var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null, templateNodes = templateNodesFunc ? templateSource['nodes']() : null; if (templateNodes) { return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes); } else { var templateText = templateSource['text'](); return ko.utils.parseHtmlFragment(templateText, templateDocument); } }; ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine(); ko.setTemplateEngine(ko.nativeTemplateEngine.instance); ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine); (function() { ko.jqueryTmplTemplateEngine = function () { // Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl // doesn't expose a version number, so we have to infer it. // Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later, // which KO internally refers to as version "2", so older versions are no longer detected. var jQueryTmplVersion = this.jQueryTmplVersion = (function() { if (!jQueryInstance || !(jQueryInstance['tmpl'])) return 0; // Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves. try { if (jQueryInstance['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) { // Since 1.0.0pre, custom tags should append markup to an array called "__" return 2; // Final version of jquery.tmpl } } catch(ex) { /* Apparently not the version we were looking for */ } return 1; // Any older version that we don't support })(); function ensureHasReferencedJQueryTemplates() { if (jQueryTmplVersion < 2) throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later."); } function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) { return jQueryInstance['tmpl'](compiledTemplate, data, jQueryTemplateOptions); } this['renderTemplateSource'] = function(templateSource, bindingContext, options, templateDocument) { templateDocument = templateDocument || document; options = options || {}; ensureHasReferencedJQueryTemplates(); // Ensure we have stored a precompiled version of this template (don't want to reparse on every render) var precompiled = templateSource['data']('precompiled'); if (!precompiled) { var templateText = templateSource['text']() || ""; // Wrap in "with($whatever.koBindingContext) { ... }" templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}"; precompiled = jQueryInstance['template'](null, templateText); templateSource['data']('precompiled', precompiled); } var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays var jQueryTemplateOptions = jQueryInstance['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']); var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions); resultNodes['appendTo'](templateDocument.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work jQueryInstance['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders return resultNodes; }; this['createJavaScriptEvaluatorBlock'] = function(script) { return "{{ko_code ((function() { return " + script + " })()) }}"; }; this['addTemplate'] = function(templateName, templateMarkup) { document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "<" + "/script>"); }; if (jQueryTmplVersion > 0) { jQueryInstance['tmpl']['tag']['ko_code'] = { open: "__.push($1 || '');" }; jQueryInstance['tmpl']['tag']['ko_with'] = { open: "with($1) {", close: "} " }; } }; ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine(); ko.jqueryTmplTemplateEngine.prototype.constructor = ko.jqueryTmplTemplateEngine; // Use this one by default *only if jquery.tmpl is referenced* var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine(); if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0) ko.setTemplateEngine(jqueryTmplTemplateEngineInstance); ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine); })(); })); }()); })();
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