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1894 lines
70 KiB
Text
1894 lines
70 KiB
Text
// Backbone.js 1.2.3
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// (c) 2010-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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// Backbone may be freely distributed under the MIT license.
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// For all details and documentation:
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// http://backbonejs.org
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(function(factory) {
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// Establish the root object, `window` (`self`) in the browser, or `global` on the server.
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// We use `self` instead of `window` for `WebWorker` support.
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var root = (typeof self == 'object' && self.self == self && self) ||
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(typeof global == 'object' && global.global == global && global);
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// Set up Backbone appropriately for the environment. Start with AMD.
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if (typeof define === 'function' && define.amd) {
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define(['underscore', 'jquery', 'exports'], function(_, $, exports) {
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// Export global even in AMD case in case this script is loaded with
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// others that may still expect a global Backbone.
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root.Backbone = factory(root, exports, _, $);
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});
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// Next for Node.js or CommonJS. jQuery may not be needed as a module.
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} else if (typeof exports !== 'undefined') {
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var _ = require('underscore'), $;
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try { $ = require('jquery'); } catch(e) {}
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factory(root, exports, _, $);
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// Finally, as a browser global.
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} else {
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root.Backbone = factory(root, {}, root._, (root.jQuery || root.Zepto || root.ender || root.$));
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}
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}(function(root, Backbone, _, $) {
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// Initial Setup
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// -------------
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// Save the previous value of the `Backbone` variable, so that it can be
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// restored later on, if `noConflict` is used.
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var previousBackbone = root.Backbone;
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// Create a local reference to a common array method we'll want to use later.
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var slice = Array.prototype.slice;
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// Current version of the library. Keep in sync with `package.json`.
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Backbone.VERSION = '1.2.3';
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// For Backbone's purposes, jQuery, Zepto, Ender, or My Library (kidding) owns
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// the `$` variable.
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Backbone.$ = $;
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// Runs Backbone.js in *noConflict* mode, returning the `Backbone` variable
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// to its previous owner. Returns a reference to this Backbone object.
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Backbone.noConflict = function() {
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root.Backbone = previousBackbone;
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return this;
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};
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// Turn on `emulateHTTP` to support legacy HTTP servers. Setting this option
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// will fake `"PATCH"`, `"PUT"` and `"DELETE"` requests via the `_method` parameter and
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// set a `X-Http-Method-Override` header.
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Backbone.emulateHTTP = false;
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// Turn on `emulateJSON` to support legacy servers that can't deal with direct
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// `application/json` requests ... this will encode the body as
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// `application/x-www-form-urlencoded` instead and will send the model in a
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// form param named `model`.
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Backbone.emulateJSON = false;
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// Proxy Backbone class methods to Underscore functions, wrapping the model's
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// `attributes` object or collection's `models` array behind the scenes.
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//
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// collection.filter(function(model) { return model.get('age') > 10 });
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// collection.each(this.addView);
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//
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// `Function#apply` can be slow so we use the method's arg count, if we know it.
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var addMethod = function(length, method, attribute) {
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switch (length) {
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case 1: return function() {
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return _[method](this[attribute]);
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};
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case 2: return function(value) {
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return _[method](this[attribute], value);
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};
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case 3: return function(iteratee, context) {
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return _[method](this[attribute], cb(iteratee, this), context);
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};
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case 4: return function(iteratee, defaultVal, context) {
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return _[method](this[attribute], cb(iteratee, this), defaultVal, context);
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};
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default: return function() {
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var args = slice.call(arguments);
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args.unshift(this[attribute]);
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return _[method].apply(_, args);
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};
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}
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};
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var addUnderscoreMethods = function(Class, methods, attribute) {
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_.each(methods, function(length, method) {
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if (_[method]) Class.prototype[method] = addMethod(length, method, attribute);
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});
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};
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// Support `collection.sortBy('attr')` and `collection.findWhere({id: 1})`.
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var cb = function(iteratee, instance) {
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if (_.isFunction(iteratee)) return iteratee;
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if (_.isObject(iteratee) && !instance._isModel(iteratee)) return modelMatcher(iteratee);
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if (_.isString(iteratee)) return function(model) { return model.get(iteratee); };
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return iteratee;
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};
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var modelMatcher = function(attrs) {
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var matcher = _.matches(attrs);
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return function(model) {
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return matcher(model.attributes);
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};
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};
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// Backbone.Events
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// ---------------
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// A module that can be mixed in to *any object* in order to provide it with
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// a custom event channel. You may bind a callback to an event with `on` or
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// remove with `off`; `trigger`-ing an event fires all callbacks in
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// succession.
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//
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// var object = {};
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// _.extend(object, Backbone.Events);
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// object.on('expand', function(){ alert('expanded'); });
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// object.trigger('expand');
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//
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var Events = Backbone.Events = {};
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// Regular expression used to split event strings.
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var eventSplitter = /\s+/;
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// Iterates over the standard `event, callback` (as well as the fancy multiple
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// space-separated events `"change blur", callback` and jQuery-style event
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// maps `{event: callback}`).
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var eventsApi = function(iteratee, events, name, callback, opts) {
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var i = 0, names;
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if (name && typeof name === 'object') {
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// Handle event maps.
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if (callback !== void 0 && 'context' in opts && opts.context === void 0) opts.context = callback;
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for (names = _.keys(name); i < names.length ; i++) {
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events = eventsApi(iteratee, events, names[i], name[names[i]], opts);
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}
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} else if (name && eventSplitter.test(name)) {
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// Handle space separated event names by delegating them individually.
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for (names = name.split(eventSplitter); i < names.length; i++) {
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events = iteratee(events, names[i], callback, opts);
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}
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} else {
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// Finally, standard events.
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events = iteratee(events, name, callback, opts);
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}
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return events;
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};
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// Bind an event to a `callback` function. Passing `"all"` will bind
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// the callback to all events fired.
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Events.on = function(name, callback, context) {
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return internalOn(this, name, callback, context);
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};
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// Guard the `listening` argument from the public API.
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var internalOn = function(obj, name, callback, context, listening) {
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obj._events = eventsApi(onApi, obj._events || {}, name, callback, {
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context: context,
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ctx: obj,
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listening: listening
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});
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if (listening) {
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var listeners = obj._listeners || (obj._listeners = {});
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listeners[listening.id] = listening;
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}
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return obj;
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};
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// Inversion-of-control versions of `on`. Tell *this* object to listen to
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// an event in another object... keeping track of what it's listening to
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// for easier unbinding later.
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Events.listenTo = function(obj, name, callback) {
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if (!obj) return this;
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var id = obj._listenId || (obj._listenId = _.uniqueId('l'));
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var listeningTo = this._listeningTo || (this._listeningTo = {});
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var listening = listeningTo[id];
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// This object is not listening to any other events on `obj` yet.
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// Setup the necessary references to track the listening callbacks.
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if (!listening) {
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var thisId = this._listenId || (this._listenId = _.uniqueId('l'));
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listening = listeningTo[id] = {obj: obj, objId: id, id: thisId, listeningTo: listeningTo, count: 0};
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}
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// Bind callbacks on obj, and keep track of them on listening.
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internalOn(obj, name, callback, this, listening);
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return this;
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};
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// The reducing API that adds a callback to the `events` object.
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var onApi = function(events, name, callback, options) {
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if (callback) {
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var handlers = events[name] || (events[name] = []);
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var context = options.context, ctx = options.ctx, listening = options.listening;
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if (listening) listening.count++;
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handlers.push({ callback: callback, context: context, ctx: context || ctx, listening: listening });
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}
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return events;
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};
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// Remove one or many callbacks. If `context` is null, removes all
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// callbacks with that function. If `callback` is null, removes all
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// callbacks for the event. If `name` is null, removes all bound
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// callbacks for all events.
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Events.off = function(name, callback, context) {
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if (!this._events) return this;
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this._events = eventsApi(offApi, this._events, name, callback, {
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context: context,
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listeners: this._listeners
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});
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return this;
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};
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// Tell this object to stop listening to either specific events ... or
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// to every object it's currently listening to.
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Events.stopListening = function(obj, name, callback) {
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var listeningTo = this._listeningTo;
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if (!listeningTo) return this;
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var ids = obj ? [obj._listenId] : _.keys(listeningTo);
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for (var i = 0; i < ids.length; i++) {
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var listening = listeningTo[ids[i]];
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// If listening doesn't exist, this object is not currently
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// listening to obj. Break out early.
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if (!listening) break;
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listening.obj.off(name, callback, this);
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}
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if (_.isEmpty(listeningTo)) this._listeningTo = void 0;
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return this;
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};
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// The reducing API that removes a callback from the `events` object.
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var offApi = function(events, name, callback, options) {
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if (!events) return;
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var i = 0, listening;
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var context = options.context, listeners = options.listeners;
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// Delete all events listeners and "drop" events.
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if (!name && !callback && !context) {
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var ids = _.keys(listeners);
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for (; i < ids.length; i++) {
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listening = listeners[ids[i]];
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delete listeners[listening.id];
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delete listening.listeningTo[listening.objId];
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}
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return;
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}
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var names = name ? [name] : _.keys(events);
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for (; i < names.length; i++) {
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name = names[i];
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var handlers = events[name];
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// Bail out if there are no events stored.
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if (!handlers) break;
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// Replace events if there are any remaining. Otherwise, clean up.
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var remaining = [];
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for (var j = 0; j < handlers.length; j++) {
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var handler = handlers[j];
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if (
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callback && callback !== handler.callback &&
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callback !== handler.callback._callback ||
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context && context !== handler.context
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) {
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remaining.push(handler);
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} else {
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listening = handler.listening;
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if (listening && --listening.count === 0) {
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delete listeners[listening.id];
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delete listening.listeningTo[listening.objId];
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}
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}
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}
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// Update tail event if the list has any events. Otherwise, clean up.
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if (remaining.length) {
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events[name] = remaining;
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} else {
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delete events[name];
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}
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}
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if (_.size(events)) return events;
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};
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// Bind an event to only be triggered a single time. After the first time
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// the callback is invoked, its listener will be removed. If multiple events
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// are passed in using the space-separated syntax, the handler will fire
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// once for each event, not once for a combination of all events.
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Events.once = function(name, callback, context) {
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// Map the event into a `{event: once}` object.
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var events = eventsApi(onceMap, {}, name, callback, _.bind(this.off, this));
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return this.on(events, void 0, context);
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};
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// Inversion-of-control versions of `once`.
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Events.listenToOnce = function(obj, name, callback) {
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// Map the event into a `{event: once}` object.
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var events = eventsApi(onceMap, {}, name, callback, _.bind(this.stopListening, this, obj));
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return this.listenTo(obj, events);
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};
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// Reduces the event callbacks into a map of `{event: onceWrapper}`.
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// `offer` unbinds the `onceWrapper` after it has been called.
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var onceMap = function(map, name, callback, offer) {
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if (callback) {
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var once = map[name] = _.once(function() {
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offer(name, once);
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callback.apply(this, arguments);
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});
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once._callback = callback;
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}
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return map;
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};
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// Trigger one or many events, firing all bound callbacks. Callbacks are
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// passed the same arguments as `trigger` is, apart from the event name
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// (unless you're listening on `"all"`, which will cause your callback to
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// receive the true name of the event as the first argument).
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Events.trigger = function(name) {
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if (!this._events) return this;
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var length = Math.max(0, arguments.length - 1);
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var args = Array(length);
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for (var i = 0; i < length; i++) args[i] = arguments[i + 1];
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eventsApi(triggerApi, this._events, name, void 0, args);
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return this;
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};
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// Handles triggering the appropriate event callbacks.
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var triggerApi = function(objEvents, name, cb, args) {
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if (objEvents) {
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var events = objEvents[name];
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var allEvents = objEvents.all;
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if (events && allEvents) allEvents = allEvents.slice();
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if (events) triggerEvents(events, args);
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if (allEvents) triggerEvents(allEvents, [name].concat(args));
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}
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return objEvents;
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};
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// A difficult-to-believe, but optimized internal dispatch function for
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// triggering events. Tries to keep the usual cases speedy (most internal
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// Backbone events have 3 arguments).
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var triggerEvents = function(events, args) {
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var ev, i = -1, l = events.length, a1 = args[0], a2 = args[1], a3 = args[2];
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switch (args.length) {
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case 0: while (++i < l) (ev = events[i]).callback.call(ev.ctx); return;
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case 1: while (++i < l) (ev = events[i]).callback.call(ev.ctx, a1); return;
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case 2: while (++i < l) (ev = events[i]).callback.call(ev.ctx, a1, a2); return;
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case 3: while (++i < l) (ev = events[i]).callback.call(ev.ctx, a1, a2, a3); return;
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default: while (++i < l) (ev = events[i]).callback.apply(ev.ctx, args); return;
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}
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};
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// Aliases for backwards compatibility.
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Events.bind = Events.on;
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Events.unbind = Events.off;
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// Allow the `Backbone` object to serve as a global event bus, for folks who
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// want global "pubsub" in a convenient place.
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_.extend(Backbone, Events);
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// Backbone.Model
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// --------------
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// Backbone **Models** are the basic data object in the framework --
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// frequently representing a row in a table in a database on your server.
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// A discrete chunk of data and a bunch of useful, related methods for
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// performing computations and transformations on that data.
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// Create a new model with the specified attributes. A client id (`cid`)
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// is automatically generated and assigned for you.
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var Model = Backbone.Model = function(attributes, options) {
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var attrs = attributes || {};
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options || (options = {});
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this.cid = _.uniqueId(this.cidPrefix);
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this.attributes = {};
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if (options.collection) this.collection = options.collection;
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if (options.parse) attrs = this.parse(attrs, options) || {};
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attrs = _.defaults({}, attrs, _.result(this, 'defaults'));
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this.set(attrs, options);
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this.changed = {};
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this.initialize.apply(this, arguments);
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};
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// Attach all inheritable methods to the Model prototype.
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_.extend(Model.prototype, Events, {
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// A hash of attributes whose current and previous value differ.
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changed: null,
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// The value returned during the last failed validation.
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validationError: null,
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// The default name for the JSON `id` attribute is `"id"`. MongoDB and
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// CouchDB users may want to set this to `"_id"`.
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idAttribute: 'id',
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// The prefix is used to create the client id which is used to identify models locally.
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// You may want to override this if you're experiencing name clashes with model ids.
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cidPrefix: 'c',
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// Initialize is an empty function by default. Override it with your own
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// initialization logic.
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initialize: function(){},
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// Return a copy of the model's `attributes` object.
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toJSON: function(options) {
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return _.clone(this.attributes);
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},
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// Proxy `Backbone.sync` by default -- but override this if you need
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// custom syncing semantics for *this* particular model.
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sync: function() {
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return Backbone.sync.apply(this, arguments);
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},
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// Get the value of an attribute.
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get: function(attr) {
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return this.attributes[attr];
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},
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// Get the HTML-escaped value of an attribute.
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escape: function(attr) {
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return _.escape(this.get(attr));
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},
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// Returns `true` if the attribute contains a value that is not null
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// or undefined.
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has: function(attr) {
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return this.get(attr) != null;
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},
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// Special-cased proxy to underscore's `_.matches` method.
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matches: function(attrs) {
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return !!_.iteratee(attrs, this)(this.attributes);
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},
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// Set a hash of model attributes on the object, firing `"change"`. This is
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// the core primitive operation of a model, updating the data and notifying
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// anyone who needs to know about the change in state. The heart of the beast.
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set: function(key, val, options) {
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if (key == null) return this;
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// Handle both `"key", value` and `{key: value}` -style arguments.
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var attrs;
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if (typeof key === 'object') {
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attrs = key;
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options = val;
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} else {
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(attrs = {})[key] = val;
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}
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options || (options = {});
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// Run validation.
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if (!this._validate(attrs, options)) return false;
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// Extract attributes and options.
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var unset = options.unset;
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var silent = options.silent;
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var changes = [];
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var changing = this._changing;
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this._changing = true;
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if (!changing) {
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this._previousAttributes = _.clone(this.attributes);
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this.changed = {};
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}
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var current = this.attributes;
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var changed = this.changed;
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var prev = this._previousAttributes;
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|
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// For each `set` attribute, update or delete the current value.
|
|
for (var attr in attrs) {
|
|
val = attrs[attr];
|
|
if (!_.isEqual(current[attr], val)) changes.push(attr);
|
|
if (!_.isEqual(prev[attr], val)) {
|
|
changed[attr] = val;
|
|
} else {
|
|
delete changed[attr];
|
|
}
|
|
unset ? delete current[attr] : current[attr] = val;
|
|
}
|
|
|
|
// Update the `id`.
|
|
this.id = this.get(this.idAttribute);
|
|
|
|
// Trigger all relevant attribute changes.
|
|
if (!silent) {
|
|
if (changes.length) this._pending = options;
|
|
for (var i = 0; i < changes.length; i++) {
|
|
this.trigger('change:' + changes[i], this, current[changes[i]], options);
|
|
}
|
|
}
|
|
|
|
// You might be wondering why there's a `while` loop here. Changes can
|
|
// be recursively nested within `"change"` events.
|
|
if (changing) return this;
|
|
if (!silent) {
|
|
while (this._pending) {
|
|
options = this._pending;
|
|
this._pending = false;
|
|
this.trigger('change', this, options);
|
|
}
|
|
}
|
|
this._pending = false;
|
|
this._changing = false;
|
|
return this;
|
|
},
|
|
|
|
// Remove an attribute from the model, firing `"change"`. `unset` is a noop
|
|
// if the attribute doesn't exist.
|
|
unset: function(attr, options) {
|
|
return this.set(attr, void 0, _.extend({}, options, {unset: true}));
|
|
},
|
|
|
|
// Clear all attributes on the model, firing `"change"`.
|
|
clear: function(options) {
|
|
var attrs = {};
|
|
for (var key in this.attributes) attrs[key] = void 0;
|
|
return this.set(attrs, _.extend({}, options, {unset: true}));
|
|
},
|
|
|
|
// Determine if the model has changed since the last `"change"` event.
|
|
// If you specify an attribute name, determine if that attribute has changed.
|
|
hasChanged: function(attr) {
|
|
if (attr == null) return !_.isEmpty(this.changed);
|
|
return _.has(this.changed, attr);
|
|
},
|
|
|
|
// Return an object containing all the attributes that have changed, or
|
|
// false if there are no changed attributes. Useful for determining what
|
|
// parts of a view need to be updated and/or what attributes need to be
|
|
// persisted to the server. Unset attributes will be set to undefined.
|
|
// You can also pass an attributes object to diff against the model,
|
|
// determining if there *would be* a change.
|
|
changedAttributes: function(diff) {
|
|
if (!diff) return this.hasChanged() ? _.clone(this.changed) : false;
|
|
var old = this._changing ? this._previousAttributes : this.attributes;
|
|
var changed = {};
|
|
for (var attr in diff) {
|
|
var val = diff[attr];
|
|
if (_.isEqual(old[attr], val)) continue;
|
|
changed[attr] = val;
|
|
}
|
|
return _.size(changed) ? changed : false;
|
|
},
|
|
|
|
// Get the previous value of an attribute, recorded at the time the last
|
|
// `"change"` event was fired.
|
|
previous: function(attr) {
|
|
if (attr == null || !this._previousAttributes) return null;
|
|
return this._previousAttributes[attr];
|
|
},
|
|
|
|
// Get all of the attributes of the model at the time of the previous
|
|
// `"change"` event.
|
|
previousAttributes: function() {
|
|
return _.clone(this._previousAttributes);
|
|
},
|
|
|
|
// Fetch the model from the server, merging the response with the model's
|
|
// local attributes. Any changed attributes will trigger a "change" event.
|
|
fetch: function(options) {
|
|
options = _.extend({parse: true}, options);
|
|
var model = this;
|
|
var success = options.success;
|
|
options.success = function(resp) {
|
|
var serverAttrs = options.parse ? model.parse(resp, options) : resp;
|
|
if (!model.set(serverAttrs, options)) return false;
|
|
if (success) success.call(options.context, model, resp, options);
|
|
model.trigger('sync', model, resp, options);
|
|
};
|
|
wrapError(this, options);
|
|
return this.sync('read', this, options);
|
|
},
|
|
|
|
// Set a hash of model attributes, and sync the model to the server.
|
|
// If the server returns an attributes hash that differs, the model's
|
|
// state will be `set` again.
|
|
save: function(key, val, options) {
|
|
// Handle both `"key", value` and `{key: value}` -style arguments.
|
|
var attrs;
|
|
if (key == null || typeof key === 'object') {
|
|
attrs = key;
|
|
options = val;
|
|
} else {
|
|
(attrs = {})[key] = val;
|
|
}
|
|
|
|
options = _.extend({validate: true, parse: true}, options);
|
|
var wait = options.wait;
|
|
|
|
// If we're not waiting and attributes exist, save acts as
|
|
// `set(attr).save(null, opts)` with validation. Otherwise, check if
|
|
// the model will be valid when the attributes, if any, are set.
|
|
if (attrs && !wait) {
|
|
if (!this.set(attrs, options)) return false;
|
|
} else {
|
|
if (!this._validate(attrs, options)) return false;
|
|
}
|
|
|
|
// After a successful server-side save, the client is (optionally)
|
|
// updated with the server-side state.
|
|
var model = this;
|
|
var success = options.success;
|
|
var attributes = this.attributes;
|
|
options.success = function(resp) {
|
|
// Ensure attributes are restored during synchronous saves.
|
|
model.attributes = attributes;
|
|
var serverAttrs = options.parse ? model.parse(resp, options) : resp;
|
|
if (wait) serverAttrs = _.extend({}, attrs, serverAttrs);
|
|
if (serverAttrs && !model.set(serverAttrs, options)) return false;
|
|
if (success) success.call(options.context, model, resp, options);
|
|
model.trigger('sync', model, resp, options);
|
|
};
|
|
wrapError(this, options);
|
|
|
|
// Set temporary attributes if `{wait: true}` to properly find new ids.
|
|
if (attrs && wait) this.attributes = _.extend({}, attributes, attrs);
|
|
|
|
var method = this.isNew() ? 'create' : (options.patch ? 'patch' : 'update');
|
|
if (method === 'patch' && !options.attrs) options.attrs = attrs;
|
|
var xhr = this.sync(method, this, options);
|
|
|
|
// Restore attributes.
|
|
this.attributes = attributes;
|
|
|
|
return xhr;
|
|
},
|
|
|
|
// Destroy this model on the server if it was already persisted.
|
|
// Optimistically removes the model from its collection, if it has one.
|
|
// If `wait: true` is passed, waits for the server to respond before removal.
|
|
destroy: function(options) {
|
|
options = options ? _.clone(options) : {};
|
|
var model = this;
|
|
var success = options.success;
|
|
var wait = options.wait;
|
|
|
|
var destroy = function() {
|
|
model.stopListening();
|
|
model.trigger('destroy', model, model.collection, options);
|
|
};
|
|
|
|
options.success = function(resp) {
|
|
if (wait) destroy();
|
|
if (success) success.call(options.context, model, resp, options);
|
|
if (!model.isNew()) model.trigger('sync', model, resp, options);
|
|
};
|
|
|
|
var xhr = false;
|
|
if (this.isNew()) {
|
|
_.defer(options.success);
|
|
} else {
|
|
wrapError(this, options);
|
|
xhr = this.sync('delete', this, options);
|
|
}
|
|
if (!wait) destroy();
|
|
return xhr;
|
|
},
|
|
|
|
// Default URL for the model's representation on the server -- if you're
|
|
// using Backbone's restful methods, override this to change the endpoint
|
|
// that will be called.
|
|
url: function() {
|
|
var base =
|
|
_.result(this, 'urlRoot') ||
|
|
_.result(this.collection, 'url') ||
|
|
urlError();
|
|
if (this.isNew()) return base;
|
|
var id = this.get(this.idAttribute);
|
|
return base.replace(/[^\/]$/, '$&/') + encodeURIComponent(id);
|
|
},
|
|
|
|
// **parse** converts a response into the hash of attributes to be `set` on
|
|
// the model. The default implementation is just to pass the response along.
|
|
parse: function(resp, options) {
|
|
return resp;
|
|
},
|
|
|
|
// Create a new model with identical attributes to this one.
|
|
clone: function() {
|
|
return new this.constructor(this.attributes);
|
|
},
|
|
|
|
// A model is new if it has never been saved to the server, and lacks an id.
|
|
isNew: function() {
|
|
return !this.has(this.idAttribute);
|
|
},
|
|
|
|
// Check if the model is currently in a valid state.
|
|
isValid: function(options) {
|
|
return this._validate({}, _.defaults({validate: true}, options));
|
|
},
|
|
|
|
// Run validation against the next complete set of model attributes,
|
|
// returning `true` if all is well. Otherwise, fire an `"invalid"` event.
|
|
_validate: function(attrs, options) {
|
|
if (!options.validate || !this.validate) return true;
|
|
attrs = _.extend({}, this.attributes, attrs);
|
|
var error = this.validationError = this.validate(attrs, options) || null;
|
|
if (!error) return true;
|
|
this.trigger('invalid', this, error, _.extend(options, {validationError: error}));
|
|
return false;
|
|
}
|
|
|
|
});
|
|
|
|
// Underscore methods that we want to implement on the Model, mapped to the
|
|
// number of arguments they take.
|
|
var modelMethods = { keys: 1, values: 1, pairs: 1, invert: 1, pick: 0,
|
|
omit: 0, chain: 1, isEmpty: 1 };
|
|
|
|
// Mix in each Underscore method as a proxy to `Model#attributes`.
|
|
addUnderscoreMethods(Model, modelMethods, 'attributes');
|
|
|
|
// Backbone.Collection
|
|
// -------------------
|
|
|
|
// If models tend to represent a single row of data, a Backbone Collection is
|
|
// more analogous to a table full of data ... or a small slice or page of that
|
|
// table, or a collection of rows that belong together for a particular reason
|
|
// -- all of the messages in this particular folder, all of the documents
|
|
// belonging to this particular author, and so on. Collections maintain
|
|
// indexes of their models, both in order, and for lookup by `id`.
|
|
|
|
// Create a new **Collection**, perhaps to contain a specific type of `model`.
|
|
// If a `comparator` is specified, the Collection will maintain
|
|
// its models in sort order, as they're added and removed.
|
|
var Collection = Backbone.Collection = function(models, options) {
|
|
options || (options = {});
|
|
if (options.model) this.model = options.model;
|
|
if (options.comparator !== void 0) this.comparator = options.comparator;
|
|
this._reset();
|
|
this.initialize.apply(this, arguments);
|
|
if (models) this.reset(models, _.extend({silent: true}, options));
|
|
};
|
|
|
|
// Default options for `Collection#set`.
|
|
var setOptions = {add: true, remove: true, merge: true};
|
|
var addOptions = {add: true, remove: false};
|
|
|
|
// Splices `insert` into `array` at index `at`.
|
|
var splice = function(array, insert, at) {
|
|
at = Math.min(Math.max(at, 0), array.length);
|
|
var tail = Array(array.length - at);
|
|
var length = insert.length;
|
|
for (var i = 0; i < tail.length; i++) tail[i] = array[i + at];
|
|
for (i = 0; i < length; i++) array[i + at] = insert[i];
|
|
for (i = 0; i < tail.length; i++) array[i + length + at] = tail[i];
|
|
};
|
|
|
|
// Define the Collection's inheritable methods.
|
|
_.extend(Collection.prototype, Events, {
|
|
|
|
// The default model for a collection is just a **Backbone.Model**.
|
|
// This should be overridden in most cases.
|
|
model: Model,
|
|
|
|
// Initialize is an empty function by default. Override it with your own
|
|
// initialization logic.
|
|
initialize: function(){},
|
|
|
|
// The JSON representation of a Collection is an array of the
|
|
// models' attributes.
|
|
toJSON: function(options) {
|
|
return this.map(function(model) { return model.toJSON(options); });
|
|
},
|
|
|
|
// Proxy `Backbone.sync` by default.
|
|
sync: function() {
|
|
return Backbone.sync.apply(this, arguments);
|
|
},
|
|
|
|
// Add a model, or list of models to the set. `models` may be Backbone
|
|
// Models or raw JavaScript objects to be converted to Models, or any
|
|
// combination of the two.
|
|
add: function(models, options) {
|
|
return this.set(models, _.extend({merge: false}, options, addOptions));
|
|
},
|
|
|
|
// Remove a model, or a list of models from the set.
|
|
remove: function(models, options) {
|
|
options = _.extend({}, options);
|
|
var singular = !_.isArray(models);
|
|
models = singular ? [models] : _.clone(models);
|
|
var removed = this._removeModels(models, options);
|
|
if (!options.silent && removed) this.trigger('update', this, options);
|
|
return singular ? removed[0] : removed;
|
|
},
|
|
|
|
// Update a collection by `set`-ing a new list of models, adding new ones,
|
|
// removing models that are no longer present, and merging models that
|
|
// already exist in the collection, as necessary. Similar to **Model#set**,
|
|
// the core operation for updating the data contained by the collection.
|
|
set: function(models, options) {
|
|
if (models == null) return;
|
|
|
|
options = _.defaults({}, options, setOptions);
|
|
if (options.parse && !this._isModel(models)) models = this.parse(models, options);
|
|
|
|
var singular = !_.isArray(models);
|
|
models = singular ? [models] : models.slice();
|
|
|
|
var at = options.at;
|
|
if (at != null) at = +at;
|
|
if (at < 0) at += this.length + 1;
|
|
|
|
var set = [];
|
|
var toAdd = [];
|
|
var toRemove = [];
|
|
var modelMap = {};
|
|
|
|
var add = options.add;
|
|
var merge = options.merge;
|
|
var remove = options.remove;
|
|
|
|
var sort = false;
|
|
var sortable = this.comparator && (at == null) && options.sort !== false;
|
|
var sortAttr = _.isString(this.comparator) ? this.comparator : null;
|
|
|
|
// Turn bare objects into model references, and prevent invalid models
|
|
// from being added.
|
|
var model;
|
|
for (var i = 0; i < models.length; i++) {
|
|
model = models[i];
|
|
|
|
// If a duplicate is found, prevent it from being added and
|
|
// optionally merge it into the existing model.
|
|
var existing = this.get(model);
|
|
if (existing) {
|
|
if (merge && model !== existing) {
|
|
var attrs = this._isModel(model) ? model.attributes : model;
|
|
if (options.parse) attrs = existing.parse(attrs, options);
|
|
existing.set(attrs, options);
|
|
if (sortable && !sort) sort = existing.hasChanged(sortAttr);
|
|
}
|
|
if (!modelMap[existing.cid]) {
|
|
modelMap[existing.cid] = true;
|
|
set.push(existing);
|
|
}
|
|
models[i] = existing;
|
|
|
|
// If this is a new, valid model, push it to the `toAdd` list.
|
|
} else if (add) {
|
|
model = models[i] = this._prepareModel(model, options);
|
|
if (model) {
|
|
toAdd.push(model);
|
|
this._addReference(model, options);
|
|
modelMap[model.cid] = true;
|
|
set.push(model);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Remove stale models.
|
|
if (remove) {
|
|
for (i = 0; i < this.length; i++) {
|
|
model = this.models[i];
|
|
if (!modelMap[model.cid]) toRemove.push(model);
|
|
}
|
|
if (toRemove.length) this._removeModels(toRemove, options);
|
|
}
|
|
|
|
// See if sorting is needed, update `length` and splice in new models.
|
|
var orderChanged = false;
|
|
var replace = !sortable && add && remove;
|
|
if (set.length && replace) {
|
|
orderChanged = this.length != set.length || _.some(this.models, function(model, index) {
|
|
return model !== set[index];
|
|
});
|
|
this.models.length = 0;
|
|
splice(this.models, set, 0);
|
|
this.length = this.models.length;
|
|
} else if (toAdd.length) {
|
|
if (sortable) sort = true;
|
|
splice(this.models, toAdd, at == null ? this.length : at);
|
|
this.length = this.models.length;
|
|
}
|
|
|
|
// Silently sort the collection if appropriate.
|
|
if (sort) this.sort({silent: true});
|
|
|
|
// Unless silenced, it's time to fire all appropriate add/sort events.
|
|
if (!options.silent) {
|
|
for (i = 0; i < toAdd.length; i++) {
|
|
if (at != null) options.index = at + i;
|
|
model = toAdd[i];
|
|
model.trigger('add', model, this, options);
|
|
}
|
|
if (sort || orderChanged) this.trigger('sort', this, options);
|
|
if (toAdd.length || toRemove.length) this.trigger('update', this, options);
|
|
}
|
|
|
|
// Return the added (or merged) model (or models).
|
|
return singular ? models[0] : models;
|
|
},
|
|
|
|
// When you have more items than you want to add or remove individually,
|
|
// you can reset the entire set with a new list of models, without firing
|
|
// any granular `add` or `remove` events. Fires `reset` when finished.
|
|
// Useful for bulk operations and optimizations.
|
|
reset: function(models, options) {
|
|
options = options ? _.clone(options) : {};
|
|
for (var i = 0; i < this.models.length; i++) {
|
|
this._removeReference(this.models[i], options);
|
|
}
|
|
options.previousModels = this.models;
|
|
this._reset();
|
|
models = this.add(models, _.extend({silent: true}, options));
|
|
if (!options.silent) this.trigger('reset', this, options);
|
|
return models;
|
|
},
|
|
|
|
// Add a model to the end of the collection.
|
|
push: function(model, options) {
|
|
return this.add(model, _.extend({at: this.length}, options));
|
|
},
|
|
|
|
// Remove a model from the end of the collection.
|
|
pop: function(options) {
|
|
var model = this.at(this.length - 1);
|
|
return this.remove(model, options);
|
|
},
|
|
|
|
// Add a model to the beginning of the collection.
|
|
unshift: function(model, options) {
|
|
return this.add(model, _.extend({at: 0}, options));
|
|
},
|
|
|
|
// Remove a model from the beginning of the collection.
|
|
shift: function(options) {
|
|
var model = this.at(0);
|
|
return this.remove(model, options);
|
|
},
|
|
|
|
// Slice out a sub-array of models from the collection.
|
|
slice: function() {
|
|
return slice.apply(this.models, arguments);
|
|
},
|
|
|
|
// Get a model from the set by id.
|
|
get: function(obj) {
|
|
if (obj == null) return void 0;
|
|
var id = this.modelId(this._isModel(obj) ? obj.attributes : obj);
|
|
return this._byId[obj] || this._byId[id] || this._byId[obj.cid];
|
|
},
|
|
|
|
// Get the model at the given index.
|
|
at: function(index) {
|
|
if (index < 0) index += this.length;
|
|
return this.models[index];
|
|
},
|
|
|
|
// Return models with matching attributes. Useful for simple cases of
|
|
// `filter`.
|
|
where: function(attrs, first) {
|
|
return this[first ? 'find' : 'filter'](attrs);
|
|
},
|
|
|
|
// Return the first model with matching attributes. Useful for simple cases
|
|
// of `find`.
|
|
findWhere: function(attrs) {
|
|
return this.where(attrs, true);
|
|
},
|
|
|
|
// Force the collection to re-sort itself. You don't need to call this under
|
|
// normal circumstances, as the set will maintain sort order as each item
|
|
// is added.
|
|
sort: function(options) {
|
|
var comparator = this.comparator;
|
|
if (!comparator) throw new Error('Cannot sort a set without a comparator');
|
|
options || (options = {});
|
|
|
|
var length = comparator.length;
|
|
if (_.isFunction(comparator)) comparator = _.bind(comparator, this);
|
|
|
|
// Run sort based on type of `comparator`.
|
|
if (length === 1 || _.isString(comparator)) {
|
|
this.models = this.sortBy(comparator);
|
|
} else {
|
|
this.models.sort(comparator);
|
|
}
|
|
if (!options.silent) this.trigger('sort', this, options);
|
|
return this;
|
|
},
|
|
|
|
// Pluck an attribute from each model in the collection.
|
|
pluck: function(attr) {
|
|
return _.invoke(this.models, 'get', attr);
|
|
},
|
|
|
|
// Fetch the default set of models for this collection, resetting the
|
|
// collection when they arrive. If `reset: true` is passed, the response
|
|
// data will be passed through the `reset` method instead of `set`.
|
|
fetch: function(options) {
|
|
options = _.extend({parse: true}, options);
|
|
var success = options.success;
|
|
var collection = this;
|
|
options.success = function(resp) {
|
|
var method = options.reset ? 'reset' : 'set';
|
|
collection[method](resp, options);
|
|
if (success) success.call(options.context, collection, resp, options);
|
|
collection.trigger('sync', collection, resp, options);
|
|
};
|
|
wrapError(this, options);
|
|
return this.sync('read', this, options);
|
|
},
|
|
|
|
// Create a new instance of a model in this collection. Add the model to the
|
|
// collection immediately, unless `wait: true` is passed, in which case we
|
|
// wait for the server to agree.
|
|
create: function(model, options) {
|
|
options = options ? _.clone(options) : {};
|
|
var wait = options.wait;
|
|
model = this._prepareModel(model, options);
|
|
if (!model) return false;
|
|
if (!wait) this.add(model, options);
|
|
var collection = this;
|
|
var success = options.success;
|
|
options.success = function(model, resp, callbackOpts) {
|
|
if (wait) collection.add(model, callbackOpts);
|
|
if (success) success.call(callbackOpts.context, model, resp, callbackOpts);
|
|
};
|
|
model.save(null, options);
|
|
return model;
|
|
},
|
|
|
|
// **parse** converts a response into a list of models to be added to the
|
|
// collection. The default implementation is just to pass it through.
|
|
parse: function(resp, options) {
|
|
return resp;
|
|
},
|
|
|
|
// Create a new collection with an identical list of models as this one.
|
|
clone: function() {
|
|
return new this.constructor(this.models, {
|
|
model: this.model,
|
|
comparator: this.comparator
|
|
});
|
|
},
|
|
|
|
// Define how to uniquely identify models in the collection.
|
|
modelId: function (attrs) {
|
|
return attrs[this.model.prototype.idAttribute || 'id'];
|
|
},
|
|
|
|
// Private method to reset all internal state. Called when the collection
|
|
// is first initialized or reset.
|
|
_reset: function() {
|
|
this.length = 0;
|
|
this.models = [];
|
|
this._byId = {};
|
|
},
|
|
|
|
// Prepare a hash of attributes (or other model) to be added to this
|
|
// collection.
|
|
_prepareModel: function(attrs, options) {
|
|
if (this._isModel(attrs)) {
|
|
if (!attrs.collection) attrs.collection = this;
|
|
return attrs;
|
|
}
|
|
options = options ? _.clone(options) : {};
|
|
options.collection = this;
|
|
var model = new this.model(attrs, options);
|
|
if (!model.validationError) return model;
|
|
this.trigger('invalid', this, model.validationError, options);
|
|
return false;
|
|
},
|
|
|
|
// Internal method called by both remove and set.
|
|
_removeModels: function(models, options) {
|
|
var removed = [];
|
|
for (var i = 0; i < models.length; i++) {
|
|
var model = this.get(models[i]);
|
|
if (!model) continue;
|
|
|
|
var index = this.indexOf(model);
|
|
this.models.splice(index, 1);
|
|
this.length--;
|
|
|
|
if (!options.silent) {
|
|
options.index = index;
|
|
model.trigger('remove', model, this, options);
|
|
}
|
|
|
|
removed.push(model);
|
|
this._removeReference(model, options);
|
|
}
|
|
return removed.length ? removed : false;
|
|
},
|
|
|
|
// Method for checking whether an object should be considered a model for
|
|
// the purposes of adding to the collection.
|
|
_isModel: function (model) {
|
|
return model instanceof Model;
|
|
},
|
|
|
|
// Internal method to create a model's ties to a collection.
|
|
_addReference: function(model, options) {
|
|
this._byId[model.cid] = model;
|
|
var id = this.modelId(model.attributes);
|
|
if (id != null) this._byId[id] = model;
|
|
model.on('all', this._onModelEvent, this);
|
|
},
|
|
|
|
// Internal method to sever a model's ties to a collection.
|
|
_removeReference: function(model, options) {
|
|
delete this._byId[model.cid];
|
|
var id = this.modelId(model.attributes);
|
|
if (id != null) delete this._byId[id];
|
|
if (this === model.collection) delete model.collection;
|
|
model.off('all', this._onModelEvent, this);
|
|
},
|
|
|
|
// Internal method called every time a model in the set fires an event.
|
|
// Sets need to update their indexes when models change ids. All other
|
|
// events simply proxy through. "add" and "remove" events that originate
|
|
// in other collections are ignored.
|
|
_onModelEvent: function(event, model, collection, options) {
|
|
if ((event === 'add' || event === 'remove') && collection !== this) return;
|
|
if (event === 'destroy') this.remove(model, options);
|
|
if (event === 'change') {
|
|
var prevId = this.modelId(model.previousAttributes());
|
|
var id = this.modelId(model.attributes);
|
|
if (prevId !== id) {
|
|
if (prevId != null) delete this._byId[prevId];
|
|
if (id != null) this._byId[id] = model;
|
|
}
|
|
}
|
|
this.trigger.apply(this, arguments);
|
|
}
|
|
|
|
});
|
|
|
|
// Underscore methods that we want to implement on the Collection.
|
|
// 90% of the core usefulness of Backbone Collections is actually implemented
|
|
// right here:
|
|
var collectionMethods = { forEach: 3, each: 3, map: 3, collect: 3, reduce: 4,
|
|
foldl: 4, inject: 4, reduceRight: 4, foldr: 4, find: 3, detect: 3, filter: 3,
|
|
select: 3, reject: 3, every: 3, all: 3, some: 3, any: 3, include: 3, includes: 3,
|
|
contains: 3, invoke: 0, max: 3, min: 3, toArray: 1, size: 1, first: 3,
|
|
head: 3, take: 3, initial: 3, rest: 3, tail: 3, drop: 3, last: 3,
|
|
without: 0, difference: 0, indexOf: 3, shuffle: 1, lastIndexOf: 3,
|
|
isEmpty: 1, chain: 1, sample: 3, partition: 3, groupBy: 3, countBy: 3,
|
|
sortBy: 3, indexBy: 3};
|
|
|
|
// Mix in each Underscore method as a proxy to `Collection#models`.
|
|
addUnderscoreMethods(Collection, collectionMethods, 'models');
|
|
|
|
// Backbone.View
|
|
// -------------
|
|
|
|
// Backbone Views are almost more convention than they are actual code. A View
|
|
// is simply a JavaScript object that represents a logical chunk of UI in the
|
|
// DOM. This might be a single item, an entire list, a sidebar or panel, or
|
|
// even the surrounding frame which wraps your whole app. Defining a chunk of
|
|
// UI as a **View** allows you to define your DOM events declaratively, without
|
|
// having to worry about render order ... and makes it easy for the view to
|
|
// react to specific changes in the state of your models.
|
|
|
|
// Creating a Backbone.View creates its initial element outside of the DOM,
|
|
// if an existing element is not provided...
|
|
var View = Backbone.View = function(options) {
|
|
this.cid = _.uniqueId('view');
|
|
_.extend(this, _.pick(options, viewOptions));
|
|
this._ensureElement();
|
|
this.initialize.apply(this, arguments);
|
|
};
|
|
|
|
// Cached regex to split keys for `delegate`.
|
|
var delegateEventSplitter = /^(\S+)\s*(.*)$/;
|
|
|
|
// List of view options to be set as properties.
|
|
var viewOptions = ['model', 'collection', 'el', 'id', 'attributes', 'className', 'tagName', 'events'];
|
|
|
|
// Set up all inheritable **Backbone.View** properties and methods.
|
|
_.extend(View.prototype, Events, {
|
|
|
|
// The default `tagName` of a View's element is `"div"`.
|
|
tagName: 'div',
|
|
|
|
// jQuery delegate for element lookup, scoped to DOM elements within the
|
|
// current view. This should be preferred to global lookups where possible.
|
|
$: function(selector) {
|
|
return this.$el.find(selector);
|
|
},
|
|
|
|
// Initialize is an empty function by default. Override it with your own
|
|
// initialization logic.
|
|
initialize: function(){},
|
|
|
|
// **render** is the core function that your view should override, in order
|
|
// to populate its element (`this.el`), with the appropriate HTML. The
|
|
// convention is for **render** to always return `this`.
|
|
render: function() {
|
|
return this;
|
|
},
|
|
|
|
// Remove this view by taking the element out of the DOM, and removing any
|
|
// applicable Backbone.Events listeners.
|
|
remove: function() {
|
|
this._removeElement();
|
|
this.stopListening();
|
|
return this;
|
|
},
|
|
|
|
// Remove this view's element from the document and all event listeners
|
|
// attached to it. Exposed for subclasses using an alternative DOM
|
|
// manipulation API.
|
|
_removeElement: function() {
|
|
this.$el.remove();
|
|
},
|
|
|
|
// Change the view's element (`this.el` property) and re-delegate the
|
|
// view's events on the new element.
|
|
setElement: function(element) {
|
|
this.undelegateEvents();
|
|
this._setElement(element);
|
|
this.delegateEvents();
|
|
return this;
|
|
},
|
|
|
|
// Creates the `this.el` and `this.$el` references for this view using the
|
|
// given `el`. `el` can be a CSS selector or an HTML string, a jQuery
|
|
// context or an element. Subclasses can override this to utilize an
|
|
// alternative DOM manipulation API and are only required to set the
|
|
// `this.el` property.
|
|
_setElement: function(el) {
|
|
this.$el = el instanceof Backbone.$ ? el : Backbone.$(el);
|
|
this.el = this.$el[0];
|
|
},
|
|
|
|
// Set callbacks, where `this.events` is a hash of
|
|
//
|
|
// *{"event selector": "callback"}*
|
|
//
|
|
// {
|
|
// 'mousedown .title': 'edit',
|
|
// 'click .button': 'save',
|
|
// 'click .open': function(e) { ... }
|
|
// }
|
|
//
|
|
// pairs. Callbacks will be bound to the view, with `this` set properly.
|
|
// Uses event delegation for efficiency.
|
|
// Omitting the selector binds the event to `this.el`.
|
|
delegateEvents: function(events) {
|
|
events || (events = _.result(this, 'events'));
|
|
if (!events) return this;
|
|
this.undelegateEvents();
|
|
for (var key in events) {
|
|
var method = events[key];
|
|
if (!_.isFunction(method)) method = this[method];
|
|
if (!method) continue;
|
|
var match = key.match(delegateEventSplitter);
|
|
this.delegate(match[1], match[2], _.bind(method, this));
|
|
}
|
|
return this;
|
|
},
|
|
|
|
// Add a single event listener to the view's element (or a child element
|
|
// using `selector`). This only works for delegate-able events: not `focus`,
|
|
// `blur`, and not `change`, `submit`, and `reset` in Internet Explorer.
|
|
delegate: function(eventName, selector, listener) {
|
|
this.$el.on(eventName + '.delegateEvents' + this.cid, selector, listener);
|
|
return this;
|
|
},
|
|
|
|
// Clears all callbacks previously bound to the view by `delegateEvents`.
|
|
// You usually don't need to use this, but may wish to if you have multiple
|
|
// Backbone views attached to the same DOM element.
|
|
undelegateEvents: function() {
|
|
if (this.$el) this.$el.off('.delegateEvents' + this.cid);
|
|
return this;
|
|
},
|
|
|
|
// A finer-grained `undelegateEvents` for removing a single delegated event.
|
|
// `selector` and `listener` are both optional.
|
|
undelegate: function(eventName, selector, listener) {
|
|
this.$el.off(eventName + '.delegateEvents' + this.cid, selector, listener);
|
|
return this;
|
|
},
|
|
|
|
// Produces a DOM element to be assigned to your view. Exposed for
|
|
// subclasses using an alternative DOM manipulation API.
|
|
_createElement: function(tagName) {
|
|
return document.createElement(tagName);
|
|
},
|
|
|
|
// Ensure that the View has a DOM element to render into.
|
|
// If `this.el` is a string, pass it through `$()`, take the first
|
|
// matching element, and re-assign it to `el`. Otherwise, create
|
|
// an element from the `id`, `className` and `tagName` properties.
|
|
_ensureElement: function() {
|
|
if (!this.el) {
|
|
var attrs = _.extend({}, _.result(this, 'attributes'));
|
|
if (this.id) attrs.id = _.result(this, 'id');
|
|
if (this.className) attrs['class'] = _.result(this, 'className');
|
|
this.setElement(this._createElement(_.result(this, 'tagName')));
|
|
this._setAttributes(attrs);
|
|
} else {
|
|
this.setElement(_.result(this, 'el'));
|
|
}
|
|
},
|
|
|
|
// Set attributes from a hash on this view's element. Exposed for
|
|
// subclasses using an alternative DOM manipulation API.
|
|
_setAttributes: function(attributes) {
|
|
this.$el.attr(attributes);
|
|
}
|
|
|
|
});
|
|
|
|
// Backbone.sync
|
|
// -------------
|
|
|
|
// Override this function to change the manner in which Backbone persists
|
|
// models to the server. You will be passed the type of request, and the
|
|
// model in question. By default, makes a RESTful Ajax request
|
|
// to the model's `url()`. Some possible customizations could be:
|
|
//
|
|
// * Use `setTimeout` to batch rapid-fire updates into a single request.
|
|
// * Send up the models as XML instead of JSON.
|
|
// * Persist models via WebSockets instead of Ajax.
|
|
//
|
|
// Turn on `Backbone.emulateHTTP` in order to send `PUT` and `DELETE` requests
|
|
// as `POST`, with a `_method` parameter containing the true HTTP method,
|
|
// as well as all requests with the body as `application/x-www-form-urlencoded`
|
|
// instead of `application/json` with the model in a param named `model`.
|
|
// Useful when interfacing with server-side languages like **PHP** that make
|
|
// it difficult to read the body of `PUT` requests.
|
|
Backbone.sync = function(method, model, options) {
|
|
var type = methodMap[method];
|
|
|
|
// Default options, unless specified.
|
|
_.defaults(options || (options = {}), {
|
|
emulateHTTP: Backbone.emulateHTTP,
|
|
emulateJSON: Backbone.emulateJSON
|
|
});
|
|
|
|
// Default JSON-request options.
|
|
var params = {type: type, dataType: 'json'};
|
|
|
|
// Ensure that we have a URL.
|
|
if (!options.url) {
|
|
params.url = _.result(model, 'url') || urlError();
|
|
}
|
|
|
|
// Ensure that we have the appropriate request data.
|
|
if (options.data == null && model && (method === 'create' || method === 'update' || method === 'patch')) {
|
|
params.contentType = 'application/json';
|
|
params.data = JSON.stringify(options.attrs || model.toJSON(options));
|
|
}
|
|
|
|
// For older servers, emulate JSON by encoding the request into an HTML-form.
|
|
if (options.emulateJSON) {
|
|
params.contentType = 'application/x-www-form-urlencoded';
|
|
params.data = params.data ? {model: params.data} : {};
|
|
}
|
|
|
|
// For older servers, emulate HTTP by mimicking the HTTP method with `_method`
|
|
// And an `X-HTTP-Method-Override` header.
|
|
if (options.emulateHTTP && (type === 'PUT' || type === 'DELETE' || type === 'PATCH')) {
|
|
params.type = 'POST';
|
|
if (options.emulateJSON) params.data._method = type;
|
|
var beforeSend = options.beforeSend;
|
|
options.beforeSend = function(xhr) {
|
|
xhr.setRequestHeader('X-HTTP-Method-Override', type);
|
|
if (beforeSend) return beforeSend.apply(this, arguments);
|
|
};
|
|
}
|
|
|
|
// Don't process data on a non-GET request.
|
|
if (params.type !== 'GET' && !options.emulateJSON) {
|
|
params.processData = false;
|
|
}
|
|
|
|
// Pass along `textStatus` and `errorThrown` from jQuery.
|
|
var error = options.error;
|
|
options.error = function(xhr, textStatus, errorThrown) {
|
|
options.textStatus = textStatus;
|
|
options.errorThrown = errorThrown;
|
|
if (error) error.call(options.context, xhr, textStatus, errorThrown);
|
|
};
|
|
|
|
// Make the request, allowing the user to override any Ajax options.
|
|
var xhr = options.xhr = Backbone.ajax(_.extend(params, options));
|
|
model.trigger('request', model, xhr, options);
|
|
return xhr;
|
|
};
|
|
|
|
// Map from CRUD to HTTP for our default `Backbone.sync` implementation.
|
|
var methodMap = {
|
|
'create': 'POST',
|
|
'update': 'PUT',
|
|
'patch': 'PATCH',
|
|
'delete': 'DELETE',
|
|
'read': 'GET'
|
|
};
|
|
|
|
// Set the default implementation of `Backbone.ajax` to proxy through to `$`.
|
|
// Override this if you'd like to use a different library.
|
|
Backbone.ajax = function() {
|
|
return Backbone.$.ajax.apply(Backbone.$, arguments);
|
|
};
|
|
|
|
// Backbone.Router
|
|
// ---------------
|
|
|
|
// Routers map faux-URLs to actions, and fire events when routes are
|
|
// matched. Creating a new one sets its `routes` hash, if not set statically.
|
|
var Router = Backbone.Router = function(options) {
|
|
options || (options = {});
|
|
if (options.routes) this.routes = options.routes;
|
|
this._bindRoutes();
|
|
this.initialize.apply(this, arguments);
|
|
};
|
|
|
|
// Cached regular expressions for matching named param parts and splatted
|
|
// parts of route strings.
|
|
var optionalParam = /\((.*?)\)/g;
|
|
var namedParam = /(\(\?)?:\w+/g;
|
|
var splatParam = /\*\w+/g;
|
|
var escapeRegExp = /[\-{}\[\]+?.,\\\^$|#\s]/g;
|
|
|
|
// Set up all inheritable **Backbone.Router** properties and methods.
|
|
_.extend(Router.prototype, Events, {
|
|
|
|
// Initialize is an empty function by default. Override it with your own
|
|
// initialization logic.
|
|
initialize: function(){},
|
|
|
|
// Manually bind a single named route to a callback. For example:
|
|
//
|
|
// this.route('search/:query/p:num', 'search', function(query, num) {
|
|
// ...
|
|
// });
|
|
//
|
|
route: function(route, name, callback) {
|
|
if (!_.isRegExp(route)) route = this._routeToRegExp(route);
|
|
if (_.isFunction(name)) {
|
|
callback = name;
|
|
name = '';
|
|
}
|
|
if (!callback) callback = this[name];
|
|
var router = this;
|
|
Backbone.history.route(route, function(fragment) {
|
|
var args = router._extractParameters(route, fragment);
|
|
if (router.execute(callback, args, name) !== false) {
|
|
router.trigger.apply(router, ['route:' + name].concat(args));
|
|
router.trigger('route', name, args);
|
|
Backbone.history.trigger('route', router, name, args);
|
|
}
|
|
});
|
|
return this;
|
|
},
|
|
|
|
// Execute a route handler with the provided parameters. This is an
|
|
// excellent place to do pre-route setup or post-route cleanup.
|
|
execute: function(callback, args, name) {
|
|
if (callback) callback.apply(this, args);
|
|
},
|
|
|
|
// Simple proxy to `Backbone.history` to save a fragment into the history.
|
|
navigate: function(fragment, options) {
|
|
Backbone.history.navigate(fragment, options);
|
|
return this;
|
|
},
|
|
|
|
// Bind all defined routes to `Backbone.history`. We have to reverse the
|
|
// order of the routes here to support behavior where the most general
|
|
// routes can be defined at the bottom of the route map.
|
|
_bindRoutes: function() {
|
|
if (!this.routes) return;
|
|
this.routes = _.result(this, 'routes');
|
|
var route, routes = _.keys(this.routes);
|
|
while ((route = routes.pop()) != null) {
|
|
this.route(route, this.routes[route]);
|
|
}
|
|
},
|
|
|
|
// Convert a route string into a regular expression, suitable for matching
|
|
// against the current location hash.
|
|
_routeToRegExp: function(route) {
|
|
route = route.replace(escapeRegExp, '\\$&')
|
|
.replace(optionalParam, '(?:$1)?')
|
|
.replace(namedParam, function(match, optional) {
|
|
return optional ? match : '([^/?]+)';
|
|
})
|
|
.replace(splatParam, '([^?]*?)');
|
|
return new RegExp('^' + route + '(?:\\?([\\s\\S]*))?$');
|
|
},
|
|
|
|
// Given a route, and a URL fragment that it matches, return the array of
|
|
// extracted decoded parameters. Empty or unmatched parameters will be
|
|
// treated as `null` to normalize cross-browser behavior.
|
|
_extractParameters: function(route, fragment) {
|
|
var params = route.exec(fragment).slice(1);
|
|
return _.map(params, function(param, i) {
|
|
// Don't decode the search params.
|
|
if (i === params.length - 1) return param || null;
|
|
return param ? decodeURIComponent(param) : null;
|
|
});
|
|
}
|
|
|
|
});
|
|
|
|
// Backbone.History
|
|
// ----------------
|
|
|
|
// Handles cross-browser history management, based on either
|
|
// [pushState](http://diveintohtml5.info/history.html) and real URLs, or
|
|
// [onhashchange](https://developer.mozilla.org/en-US/docs/DOM/window.onhashchange)
|
|
// and URL fragments. If the browser supports neither (old IE, natch),
|
|
// falls back to polling.
|
|
var History = Backbone.History = function() {
|
|
this.handlers = [];
|
|
this.checkUrl = _.bind(this.checkUrl, this);
|
|
|
|
// Ensure that `History` can be used outside of the browser.
|
|
if (typeof window !== 'undefined') {
|
|
this.location = window.location;
|
|
this.history = window.history;
|
|
}
|
|
};
|
|
|
|
// Cached regex for stripping a leading hash/slash and trailing space.
|
|
var routeStripper = /^[#\/]|\s+$/g;
|
|
|
|
// Cached regex for stripping leading and trailing slashes.
|
|
var rootStripper = /^\/+|\/+$/g;
|
|
|
|
// Cached regex for stripping urls of hash.
|
|
var pathStripper = /#.*$/;
|
|
|
|
// Has the history handling already been started?
|
|
History.started = false;
|
|
|
|
// Set up all inheritable **Backbone.History** properties and methods.
|
|
_.extend(History.prototype, Events, {
|
|
|
|
// The default interval to poll for hash changes, if necessary, is
|
|
// twenty times a second.
|
|
interval: 50,
|
|
|
|
// Are we at the app root?
|
|
atRoot: function() {
|
|
var path = this.location.pathname.replace(/[^\/]$/, '$&/');
|
|
return path === this.root && !this.getSearch();
|
|
},
|
|
|
|
// Does the pathname match the root?
|
|
matchRoot: function() {
|
|
var path = this.decodeFragment(this.location.pathname);
|
|
var root = path.slice(0, this.root.length - 1) + '/';
|
|
return root === this.root;
|
|
},
|
|
|
|
// Unicode characters in `location.pathname` are percent encoded so they're
|
|
// decoded for comparison. `%25` should not be decoded since it may be part
|
|
// of an encoded parameter.
|
|
decodeFragment: function(fragment) {
|
|
return decodeURI(fragment.replace(/%25/g, '%2525'));
|
|
},
|
|
|
|
// In IE6, the hash fragment and search params are incorrect if the
|
|
// fragment contains `?`.
|
|
getSearch: function() {
|
|
var match = this.location.href.replace(/#.*/, '').match(/\?.+/);
|
|
return match ? match[0] : '';
|
|
},
|
|
|
|
// Gets the true hash value. Cannot use location.hash directly due to bug
|
|
// in Firefox where location.hash will always be decoded.
|
|
getHash: function(window) {
|
|
var match = (window || this).location.href.match(/#(.*)$/);
|
|
return match ? match[1] : '';
|
|
},
|
|
|
|
// Get the pathname and search params, without the root.
|
|
getPath: function() {
|
|
var path = this.decodeFragment(
|
|
this.location.pathname + this.getSearch()
|
|
).slice(this.root.length - 1);
|
|
return path.charAt(0) === '/' ? path.slice(1) : path;
|
|
},
|
|
|
|
// Get the cross-browser normalized URL fragment from the path or hash.
|
|
getFragment: function(fragment) {
|
|
if (fragment == null) {
|
|
if (this._usePushState || !this._wantsHashChange) {
|
|
fragment = this.getPath();
|
|
} else {
|
|
fragment = this.getHash();
|
|
}
|
|
}
|
|
return fragment.replace(routeStripper, '');
|
|
},
|
|
|
|
// Start the hash change handling, returning `true` if the current URL matches
|
|
// an existing route, and `false` otherwise.
|
|
start: function(options) {
|
|
if (History.started) throw new Error('Backbone.history has already been started');
|
|
History.started = true;
|
|
|
|
// Figure out the initial configuration. Do we need an iframe?
|
|
// Is pushState desired ... is it available?
|
|
this.options = _.extend({root: '/'}, this.options, options);
|
|
this.root = this.options.root;
|
|
this._wantsHashChange = this.options.hashChange !== false;
|
|
this._hasHashChange = 'onhashchange' in window && (document.documentMode === void 0 || document.documentMode > 7);
|
|
this._useHashChange = this._wantsHashChange && this._hasHashChange;
|
|
this._wantsPushState = !!this.options.pushState;
|
|
this._hasPushState = !!(this.history && this.history.pushState);
|
|
this._usePushState = this._wantsPushState && this._hasPushState;
|
|
this.fragment = this.getFragment();
|
|
|
|
// Normalize root to always include a leading and trailing slash.
|
|
this.root = ('/' + this.root + '/').replace(rootStripper, '/');
|
|
|
|
// Transition from hashChange to pushState or vice versa if both are
|
|
// requested.
|
|
if (this._wantsHashChange && this._wantsPushState) {
|
|
|
|
// If we've started off with a route from a `pushState`-enabled
|
|
// browser, but we're currently in a browser that doesn't support it...
|
|
if (!this._hasPushState && !this.atRoot()) {
|
|
var root = this.root.slice(0, -1) || '/';
|
|
this.location.replace(root + '#' + this.getPath());
|
|
// Return immediately as browser will do redirect to new url
|
|
return true;
|
|
|
|
// Or if we've started out with a hash-based route, but we're currently
|
|
// in a browser where it could be `pushState`-based instead...
|
|
} else if (this._hasPushState && this.atRoot()) {
|
|
this.navigate(this.getHash(), {replace: true});
|
|
}
|
|
|
|
}
|
|
|
|
// Proxy an iframe to handle location events if the browser doesn't
|
|
// support the `hashchange` event, HTML5 history, or the user wants
|
|
// `hashChange` but not `pushState`.
|
|
if (!this._hasHashChange && this._wantsHashChange && !this._usePushState) {
|
|
this.iframe = document.createElement('iframe');
|
|
this.iframe.src = 'javascript:0';
|
|
this.iframe.style.display = 'none';
|
|
this.iframe.tabIndex = -1;
|
|
var body = document.body;
|
|
// Using `appendChild` will throw on IE < 9 if the document is not ready.
|
|
var iWindow = body.insertBefore(this.iframe, body.firstChild).contentWindow;
|
|
iWindow.document.open();
|
|
iWindow.document.close();
|
|
iWindow.location.hash = '#' + this.fragment;
|
|
}
|
|
|
|
// Add a cross-platform `addEventListener` shim for older browsers.
|
|
var addEventListener = window.addEventListener || function (eventName, listener) {
|
|
return attachEvent('on' + eventName, listener);
|
|
};
|
|
|
|
// Depending on whether we're using pushState or hashes, and whether
|
|
// 'onhashchange' is supported, determine how we check the URL state.
|
|
if (this._usePushState) {
|
|
addEventListener('popstate', this.checkUrl, false);
|
|
} else if (this._useHashChange && !this.iframe) {
|
|
addEventListener('hashchange', this.checkUrl, false);
|
|
} else if (this._wantsHashChange) {
|
|
this._checkUrlInterval = setInterval(this.checkUrl, this.interval);
|
|
}
|
|
|
|
if (!this.options.silent) return this.loadUrl();
|
|
},
|
|
|
|
// Disable Backbone.history, perhaps temporarily. Not useful in a real app,
|
|
// but possibly useful for unit testing Routers.
|
|
stop: function() {
|
|
// Add a cross-platform `removeEventListener` shim for older browsers.
|
|
var removeEventListener = window.removeEventListener || function (eventName, listener) {
|
|
return detachEvent('on' + eventName, listener);
|
|
};
|
|
|
|
// Remove window listeners.
|
|
if (this._usePushState) {
|
|
removeEventListener('popstate', this.checkUrl, false);
|
|
} else if (this._useHashChange && !this.iframe) {
|
|
removeEventListener('hashchange', this.checkUrl, false);
|
|
}
|
|
|
|
// Clean up the iframe if necessary.
|
|
if (this.iframe) {
|
|
document.body.removeChild(this.iframe);
|
|
this.iframe = null;
|
|
}
|
|
|
|
// Some environments will throw when clearing an undefined interval.
|
|
if (this._checkUrlInterval) clearInterval(this._checkUrlInterval);
|
|
History.started = false;
|
|
},
|
|
|
|
// Add a route to be tested when the fragment changes. Routes added later
|
|
// may override previous routes.
|
|
route: function(route, callback) {
|
|
this.handlers.unshift({route: route, callback: callback});
|
|
},
|
|
|
|
// Checks the current URL to see if it has changed, and if it has,
|
|
// calls `loadUrl`, normalizing across the hidden iframe.
|
|
checkUrl: function(e) {
|
|
var current = this.getFragment();
|
|
|
|
// If the user pressed the back button, the iframe's hash will have
|
|
// changed and we should use that for comparison.
|
|
if (current === this.fragment && this.iframe) {
|
|
current = this.getHash(this.iframe.contentWindow);
|
|
}
|
|
|
|
if (current === this.fragment) return false;
|
|
if (this.iframe) this.navigate(current);
|
|
this.loadUrl();
|
|
},
|
|
|
|
// Attempt to load the current URL fragment. If a route succeeds with a
|
|
// match, returns `true`. If no defined routes matches the fragment,
|
|
// returns `false`.
|
|
loadUrl: function(fragment) {
|
|
// If the root doesn't match, no routes can match either.
|
|
if (!this.matchRoot()) return false;
|
|
fragment = this.fragment = this.getFragment(fragment);
|
|
return _.some(this.handlers, function(handler) {
|
|
if (handler.route.test(fragment)) {
|
|
handler.callback(fragment);
|
|
return true;
|
|
}
|
|
});
|
|
},
|
|
|
|
// Save a fragment into the hash history, or replace the URL state if the
|
|
// 'replace' option is passed. You are responsible for properly URL-encoding
|
|
// the fragment in advance.
|
|
//
|
|
// The options object can contain `trigger: true` if you wish to have the
|
|
// route callback be fired (not usually desirable), or `replace: true`, if
|
|
// you wish to modify the current URL without adding an entry to the history.
|
|
navigate: function(fragment, options) {
|
|
if (!History.started) return false;
|
|
if (!options || options === true) options = {trigger: !!options};
|
|
|
|
// Normalize the fragment.
|
|
fragment = this.getFragment(fragment || '');
|
|
|
|
// Don't include a trailing slash on the root.
|
|
var root = this.root;
|
|
if (fragment === '' || fragment.charAt(0) === '?') {
|
|
root = root.slice(0, -1) || '/';
|
|
}
|
|
var url = root + fragment;
|
|
|
|
// Strip the hash and decode for matching.
|
|
fragment = this.decodeFragment(fragment.replace(pathStripper, ''));
|
|
|
|
if (this.fragment === fragment) return;
|
|
this.fragment = fragment;
|
|
|
|
// If pushState is available, we use it to set the fragment as a real URL.
|
|
if (this._usePushState) {
|
|
this.history[options.replace ? 'replaceState' : 'pushState']({}, document.title, url);
|
|
|
|
// If hash changes haven't been explicitly disabled, update the hash
|
|
// fragment to store history.
|
|
} else if (this._wantsHashChange) {
|
|
this._updateHash(this.location, fragment, options.replace);
|
|
if (this.iframe && (fragment !== this.getHash(this.iframe.contentWindow))) {
|
|
var iWindow = this.iframe.contentWindow;
|
|
|
|
// Opening and closing the iframe tricks IE7 and earlier to push a
|
|
// history entry on hash-tag change. When replace is true, we don't
|
|
// want this.
|
|
if (!options.replace) {
|
|
iWindow.document.open();
|
|
iWindow.document.close();
|
|
}
|
|
|
|
this._updateHash(iWindow.location, fragment, options.replace);
|
|
}
|
|
|
|
// If you've told us that you explicitly don't want fallback hashchange-
|
|
// based history, then `navigate` becomes a page refresh.
|
|
} else {
|
|
return this.location.assign(url);
|
|
}
|
|
if (options.trigger) return this.loadUrl(fragment);
|
|
},
|
|
|
|
// Update the hash location, either replacing the current entry, or adding
|
|
// a new one to the browser history.
|
|
_updateHash: function(location, fragment, replace) {
|
|
if (replace) {
|
|
var href = location.href.replace(/(javascript:|#).*$/, '');
|
|
location.replace(href + '#' + fragment);
|
|
} else {
|
|
// Some browsers require that `hash` contains a leading #.
|
|
location.hash = '#' + fragment;
|
|
}
|
|
}
|
|
|
|
});
|
|
|
|
// Create the default Backbone.history.
|
|
Backbone.history = new History;
|
|
|
|
// Helpers
|
|
// -------
|
|
|
|
// Helper function to correctly set up the prototype chain for subclasses.
|
|
// Similar to `goog.inherits`, but uses a hash of prototype properties and
|
|
// class properties to be extended.
|
|
var extend = function(protoProps, staticProps) {
|
|
var parent = this;
|
|
var child;
|
|
|
|
// The constructor function for the new subclass is either defined by you
|
|
// (the "constructor" property in your `extend` definition), or defaulted
|
|
// by us to simply call the parent constructor.
|
|
if (protoProps && _.has(protoProps, 'constructor')) {
|
|
child = protoProps.constructor;
|
|
} else {
|
|
child = function(){ return parent.apply(this, arguments); };
|
|
}
|
|
|
|
// Add static properties to the constructor function, if supplied.
|
|
_.extend(child, parent, staticProps);
|
|
|
|
// Set the prototype chain to inherit from `parent`, without calling
|
|
// `parent` constructor function.
|
|
var Surrogate = function(){ this.constructor = child; };
|
|
Surrogate.prototype = parent.prototype;
|
|
child.prototype = new Surrogate;
|
|
|
|
// Add prototype properties (instance properties) to the subclass,
|
|
// if supplied.
|
|
if (protoProps) _.extend(child.prototype, protoProps);
|
|
|
|
// Set a convenience property in case the parent's prototype is needed
|
|
// later.
|
|
child.__super__ = parent.prototype;
|
|
|
|
return child;
|
|
};
|
|
|
|
// Set up inheritance for the model, collection, router, view and history.
|
|
Model.extend = Collection.extend = Router.extend = View.extend = History.extend = extend;
|
|
|
|
// Throw an error when a URL is needed, and none is supplied.
|
|
var urlError = function() {
|
|
throw new Error('A "url" property or function must be specified');
|
|
};
|
|
|
|
// Wrap an optional error callback with a fallback error event.
|
|
var wrapError = function(model, options) {
|
|
var error = options.error;
|
|
options.error = function(resp) {
|
|
if (error) error.call(options.context, model, resp, options);
|
|
model.trigger('error', model, resp, options);
|
|
};
|
|
};
|
|
|
|
return Backbone;
|
|
|
|
}));
|