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1609 lines
60 KiB
JavaScript
1609 lines
60 KiB
JavaScript
// Backbone.js 1.1.2
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// (c) 2010-2014 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(root, factory) {
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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, _, $);
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});
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// Next for Node.js or CommonJS. jQuery may not be needed as a module.
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} else if (typeof exports !== 'undefined') {
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var _ = require('underscore');
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factory(root, exports, _);
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// Finally, as a browser global.
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} else {
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root.Backbone = factory(root, {}, root._, (root.jQuery || root.Zepto || root.ender || root.$));
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}
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}(this, function(root, Backbone, _, $) {
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// Initial Setup
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// -------------
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// Save the previous value of the `Backbone` variable, so that it can be
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// restored later on, if `noConflict` is used.
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var previousBackbone = root.Backbone;
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// Create local references to array methods we'll want to use later.
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var array = [];
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var push = array.push;
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var slice = array.slice;
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var splice = array.splice;
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// Current version of the library. Keep in sync with `package.json`.
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Backbone.VERSION = '1.1.2';
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// For Backbone's purposes, jQuery, Zepto, Ender, or My Library (kidding) owns
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// the `$` 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 ... 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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// 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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// custom events. You may bind with `on` or remove with `off` callback
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// functions to an event; `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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// 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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on: function(name, callback, context) {
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if (!eventsApi(this, 'on', name, [callback, context]) || !callback) return this;
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this._events || (this._events = {});
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var events = this._events[name] || (this._events[name] = []);
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events.push({callback: callback, context: context, ctx: context || this});
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return this;
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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, it will be removed.
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once: function(name, callback, context) {
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if (!eventsApi(this, 'once', name, [callback, context]) || !callback) return this;
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var self = this;
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var once = _.once(function() {
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self.off(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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return this.on(name, once, context);
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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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off: function(name, callback, context) {
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var retain, ev, events, names, i, l, j, k;
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if (!this._events || !eventsApi(this, 'off', name, [callback, context])) return this;
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if (!name && !callback && !context) {
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this._events = void 0;
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return this;
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}
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names = name ? [name] : _.keys(this._events);
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for (i = 0, l = names.length; i < l; i++) {
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name = names[i];
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if (events = this._events[name]) {
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this._events[name] = retain = [];
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if (callback || context) {
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for (j = 0, k = events.length; j < k; j++) {
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ev = events[j];
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if ((callback && callback !== ev.callback && callback !== ev.callback._callback) ||
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(context && context !== ev.context)) {
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retain.push(ev);
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}
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}
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}
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if (!retain.length) delete this._events[name];
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}
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}
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return this;
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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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trigger: function(name) {
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if (!this._events) return this;
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var args = slice.call(arguments, 1);
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if (!eventsApi(this, 'trigger', name, args)) return this;
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var events = this._events[name];
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var allEvents = this._events.all;
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if (events) triggerEvents(events, args);
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if (allEvents) triggerEvents(allEvents, arguments);
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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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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 remove = !name && !callback;
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if (!callback && typeof name === 'object') callback = this;
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if (obj) (listeningTo = {})[obj._listenId] = obj;
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for (var id in listeningTo) {
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obj = listeningTo[id];
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obj.off(name, callback, this);
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if (remove || _.isEmpty(obj._events)) delete this._listeningTo[id];
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}
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return this;
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}
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};
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// Regular expression used to split event strings.
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var eventSplitter = /\s+/;
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// Implement fancy features of the Events API such as multiple event
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// names `"change blur"` and jQuery-style event maps `{change: action}`
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// in terms of the existing API.
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var eventsApi = function(obj, action, name, rest) {
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if (!name) return true;
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// Handle event maps.
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if (typeof name === 'object') {
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for (var key in name) {
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obj[action].apply(obj, [key, name[key]].concat(rest));
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}
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return false;
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}
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// Handle space separated event names.
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if (eventSplitter.test(name)) {
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var names = name.split(eventSplitter);
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for (var i = 0, l = names.length; i < l; i++) {
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obj[action].apply(obj, [names[i]].concat(rest));
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}
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return false;
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}
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return true;
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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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var listenMethods = {listenTo: 'on', listenToOnce: 'once'};
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// Inversion-of-control versions of `on` and `once`. Tell *this* object to
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// listen to an event in another object ... keeping track of what it's
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// listening to.
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_.each(listenMethods, function(implementation, method) {
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Events[method] = function(obj, name, callback) {
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var listeningTo = this._listeningTo || (this._listeningTo = {});
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var id = obj._listenId || (obj._listenId = _.uniqueId('l'));
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listeningTo[id] = obj;
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if (!callback && typeof name === 'object') callback = this;
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obj[implementation](name, callback, this);
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return this;
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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('c');
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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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// 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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// 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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var attr, attrs, unset, changes, silent, changing, prev, current;
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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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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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unset = options.unset;
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silent = options.silent;
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changes = [];
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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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current = this.attributes, prev = this._previousAttributes;
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// Check for changes of `id`.
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if (this.idAttribute in attrs) this.id = attrs[this.idAttribute];
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// For each `set` attribute, update or delete the current value.
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for (attr in attrs) {
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val = attrs[attr];
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if (!_.isEqual(current[attr], val)) changes.push(attr);
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if (!_.isEqual(prev[attr], val)) {
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this.changed[attr] = val;
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} else {
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delete this.changed[attr];
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}
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unset ? delete current[attr] : current[attr] = val;
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}
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// Trigger all relevant attribute changes.
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if (!silent) {
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if (changes.length) this._pending = options;
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for (var i = 0, l = changes.length; i < l; i++) {
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this.trigger('change:' + changes[i], this, current[changes[i]], options);
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}
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}
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// You might be wondering why there's a `while` loop here. Changes can
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// be recursively nested within `"change"` events.
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if (changing) return this;
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if (!silent) {
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while (this._pending) {
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options = this._pending;
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this._pending = false;
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this.trigger('change', this, options);
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}
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}
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this._pending = false;
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this._changing = false;
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return this;
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},
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// Remove an attribute from the model, firing `"change"`. `unset` is a noop
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// if the attribute doesn't exist.
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unset: function(attr, options) {
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return this.set(attr, void 0, _.extend({}, options, {unset: true}));
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},
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// Clear all attributes on the model, firing `"change"`.
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clear: function(options) {
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var attrs = {};
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for (var key in this.attributes) attrs[key] = void 0;
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return this.set(attrs, _.extend({}, options, {unset: true}));
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},
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// Determine if the model has changed since the last `"change"` event.
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// If you specify an attribute name, determine if that attribute has changed.
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hasChanged: function(attr) {
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if (attr == null) return !_.isEmpty(this.changed);
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return _.has(this.changed, attr);
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},
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// Return an object containing all the attributes that have changed, or
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// false if there are no changed attributes. Useful for determining what
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// parts of a view need to be updated and/or what attributes need to be
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// persisted to the server. Unset attributes will be set to undefined.
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// You can also pass an attributes object to diff against the model,
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// determining if there *would be* a change.
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changedAttributes: function(diff) {
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if (!diff) return this.hasChanged() ? _.clone(this.changed) : false;
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var val, changed = false;
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var old = this._changing ? this._previousAttributes : this.attributes;
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for (var attr in diff) {
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if (_.isEqual(old[attr], (val = diff[attr]))) continue;
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(changed || (changed = {}))[attr] = val;
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}
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return changed;
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},
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// Get the previous value of an attribute, recorded at the time the last
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// `"change"` event was fired.
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previous: function(attr) {
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if (attr == null || !this._previousAttributes) return null;
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return this._previousAttributes[attr];
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},
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// Get all of the attributes of the model at the time of the previous
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// `"change"` event.
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previousAttributes: function() {
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return _.clone(this._previousAttributes);
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},
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// Fetch the model from the server. If the server's representation of the
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// model differs from its current attributes, they will be overridden,
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// triggering a `"change"` event.
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fetch: function(options) {
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options = options ? _.clone(options) : {};
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if (options.parse === void 0) options.parse = true;
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var model = this;
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var success = options.success;
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options.success = function(resp) {
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if (!model.set(model.parse(resp, options), options)) return false;
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if (success) success(model, resp, options);
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model.trigger('sync', model, resp, options);
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};
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wrapError(this, options);
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return this.sync('read', this, options);
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},
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// Set a hash of model attributes, and sync the model to the server.
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// If the server returns an attributes hash that differs, the model's
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// state will be `set` again.
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save: function(key, val, options) {
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var attrs, method, xhr, attributes = this.attributes;
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// Handle both `"key", value` and `{key: value}` -style arguments.
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if (key == null || 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 = _.extend({validate: true}, options);
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// If we're not waiting and attributes exist, save acts as
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// `set(attr).save(null, opts)` with validation. Otherwise, check if
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// the model will be valid when the attributes, if any, are set.
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if (attrs && !options.wait) {
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if (!this.set(attrs, options)) return false;
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} else {
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if (!this._validate(attrs, options)) return false;
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}
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// Set temporary attributes if `{wait: true}`.
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if (attrs && options.wait) {
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this.attributes = _.extend({}, attributes, attrs);
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}
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// After a successful server-side save, the client is (optionally)
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// updated with the server-side state.
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if (options.parse === void 0) options.parse = true;
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var model = this;
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var success = options.success;
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options.success = function(resp) {
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// Ensure attributes are restored during synchronous saves.
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model.attributes = attributes;
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var serverAttrs = model.parse(resp, options);
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if (options.wait) serverAttrs = _.extend(attrs || {}, serverAttrs);
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if (_.isObject(serverAttrs) && !model.set(serverAttrs, options)) {
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return false;
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}
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if (success) success(model, resp, options);
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model.trigger('sync', model, resp, options);
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};
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wrapError(this, options);
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method = this.isNew() ? 'create' : (options.patch ? 'patch' : 'update');
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if (method === 'patch') options.attrs = attrs;
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|
xhr = this.sync(method, this, options);
|
|
|
|
// Restore attributes.
|
|
if (attrs && options.wait) 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 destroy = function() {
|
|
model.trigger('destroy', model, model.collection, options);
|
|
};
|
|
|
|
options.success = function(resp) {
|
|
if (options.wait || model.isNew()) destroy();
|
|
if (success) success(model, resp, options);
|
|
if (!model.isNew()) model.trigger('sync', model, resp, options);
|
|
};
|
|
|
|
if (this.isNew()) {
|
|
options.success();
|
|
return false;
|
|
}
|
|
wrapError(this, options);
|
|
|
|
var xhr = this.sync('delete', this, options);
|
|
if (!options.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;
|
|
return base.replace(/([^\/])$/, '$1/') + encodeURIComponent(this.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({}, _.extend(options || {}, { validate: true }));
|
|
},
|
|
|
|
// 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.
|
|
var modelMethods = ['keys', 'values', 'pairs', 'invert', 'pick', 'omit'];
|
|
|
|
// Mix in each Underscore method as a proxy to `Model#attributes`.
|
|
_.each(modelMethods, function(method) {
|
|
Model.prototype[method] = function() {
|
|
var args = slice.call(arguments);
|
|
args.unshift(this.attributes);
|
|
return _[method].apply(_, args);
|
|
};
|
|
});
|
|
|
|
// Backbone.Collection
|
|
// -------------------
|
|
|
|
// If models tend to represent a single row of data, a Backbone Collection is
|
|
// more analagous 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};
|
|
|
|
// 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.
|
|
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) {
|
|
var singular = !_.isArray(models);
|
|
models = singular ? [models] : _.clone(models);
|
|
options || (options = {});
|
|
var i, l, index, model;
|
|
for (i = 0, l = models.length; i < l; i++) {
|
|
model = models[i] = this.get(models[i]);
|
|
if (!model) continue;
|
|
delete this._byId[model.id];
|
|
delete this._byId[model.cid];
|
|
index = this.indexOf(model);
|
|
this.models.splice(index, 1);
|
|
this.length--;
|
|
if (!options.silent) {
|
|
options.index = index;
|
|
model.trigger('remove', model, this, options);
|
|
}
|
|
this._removeReference(model, options);
|
|
}
|
|
return singular ? models[0] : models;
|
|
},
|
|
|
|
// 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) {
|
|
options = _.defaults({}, options, setOptions);
|
|
if (options.parse) models = this.parse(models, options);
|
|
var singular = !_.isArray(models);
|
|
models = singular ? (models ? [models] : []) : _.clone(models);
|
|
var i, l, id, model, attrs, existing, sort;
|
|
var at = options.at;
|
|
var targetModel = this.model;
|
|
var sortable = this.comparator && (at == null) && options.sort !== false;
|
|
var sortAttr = _.isString(this.comparator) ? this.comparator : null;
|
|
var toAdd = [], toRemove = [], modelMap = {};
|
|
var add = options.add, merge = options.merge, remove = options.remove;
|
|
var order = !sortable && add && remove ? [] : false;
|
|
|
|
// Turn bare objects into model references, and prevent invalid models
|
|
// from being added.
|
|
for (i = 0, l = models.length; i < l; i++) {
|
|
attrs = models[i] || {};
|
|
if (attrs instanceof Model) {
|
|
id = model = attrs;
|
|
} else {
|
|
id = attrs[targetModel.prototype.idAttribute || 'id'];
|
|
}
|
|
|
|
// If a duplicate is found, prevent it from being added and
|
|
// optionally merge it into the existing model.
|
|
if (existing = this.get(id)) {
|
|
if (remove) modelMap[existing.cid] = true;
|
|
if (merge) {
|
|
attrs = attrs === model ? model.attributes : attrs;
|
|
if (options.parse) attrs = existing.parse(attrs, options);
|
|
existing.set(attrs, options);
|
|
if (sortable && !sort && existing.hasChanged(sortAttr)) sort = true;
|
|
}
|
|
models[i] = existing;
|
|
|
|
// If this is a new, valid model, push it to the `toAdd` list.
|
|
} else if (add) {
|
|
model = models[i] = this._prepareModel(attrs, options);
|
|
if (!model) continue;
|
|
toAdd.push(model);
|
|
this._addReference(model, options);
|
|
}
|
|
|
|
// Do not add multiple models with the same `id`.
|
|
model = existing || model;
|
|
if (order && (model.isNew() || !modelMap[model.id])) order.push(model);
|
|
modelMap[model.id] = true;
|
|
}
|
|
|
|
// Remove nonexistent models if appropriate.
|
|
if (remove) {
|
|
for (i = 0, l = this.length; i < l; ++i) {
|
|
if (!modelMap[(model = this.models[i]).cid]) toRemove.push(model);
|
|
}
|
|
if (toRemove.length) this.remove(toRemove, options);
|
|
}
|
|
|
|
// See if sorting is needed, update `length` and splice in new models.
|
|
if (toAdd.length || (order && order.length)) {
|
|
if (sortable) sort = true;
|
|
this.length += toAdd.length;
|
|
if (at != null) {
|
|
for (i = 0, l = toAdd.length; i < l; i++) {
|
|
this.models.splice(at + i, 0, toAdd[i]);
|
|
}
|
|
} else {
|
|
if (order) this.models.length = 0;
|
|
var orderedModels = order || toAdd;
|
|
for (i = 0, l = orderedModels.length; i < l; i++) {
|
|
this.models.push(orderedModels[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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, l = toAdd.length; i < l; i++) {
|
|
(model = toAdd[i]).trigger('add', model, this, options);
|
|
}
|
|
if (sort || (order && order.length)) this.trigger('sort', 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 = {});
|
|
for (var i = 0, l = this.models.length; i < l; 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);
|
|
this.remove(model, options);
|
|
return model;
|
|
},
|
|
|
|
// 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);
|
|
this.remove(model, options);
|
|
return model;
|
|
},
|
|
|
|
// 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;
|
|
return this._byId[obj] || this._byId[obj.id] || this._byId[obj.cid];
|
|
},
|
|
|
|
// Get the model at the given index.
|
|
at: function(index) {
|
|
return this.models[index];
|
|
},
|
|
|
|
// Return models with matching attributes. Useful for simple cases of
|
|
// `filter`.
|
|
where: function(attrs, first) {
|
|
if (_.isEmpty(attrs)) return first ? void 0 : [];
|
|
return this[first ? 'find' : 'filter'](function(model) {
|
|
for (var key in attrs) {
|
|
if (attrs[key] !== model.get(key)) return false;
|
|
}
|
|
return true;
|
|
});
|
|
},
|
|
|
|
// 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) {
|
|
if (!this.comparator) throw new Error('Cannot sort a set without a comparator');
|
|
options || (options = {});
|
|
|
|
// Run sort based on type of `comparator`.
|
|
if (_.isString(this.comparator) || this.comparator.length === 1) {
|
|
this.models = this.sortBy(this.comparator, this);
|
|
} else {
|
|
this.models.sort(_.bind(this.comparator, this));
|
|
}
|
|
|
|
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 = options ? _.clone(options) : {};
|
|
if (options.parse === void 0) options.parse = true;
|
|
var success = options.success;
|
|
var collection = this;
|
|
options.success = function(resp) {
|
|
var method = options.reset ? 'reset' : 'set';
|
|
collection[method](resp, options);
|
|
if (success) success(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) : {};
|
|
if (!(model = this._prepareModel(model, options))) return false;
|
|
if (!options.wait) this.add(model, options);
|
|
var collection = this;
|
|
var success = options.success;
|
|
options.success = function(model, resp) {
|
|
if (options.wait) collection.add(model, options);
|
|
if (success) success(model, resp, options);
|
|
};
|
|
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);
|
|
},
|
|
|
|
// 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 (attrs instanceof Model) 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 to create a model's ties to a collection.
|
|
_addReference: function(model, options) {
|
|
this._byId[model.cid] = model;
|
|
if (model.id != null) this._byId[model.id] = model;
|
|
if (!model.collection) model.collection = this;
|
|
model.on('all', this._onModelEvent, this);
|
|
},
|
|
|
|
// Internal method to sever a model's ties to a collection.
|
|
_removeReference: function(model, options) {
|
|
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 (model && event === 'change:' + model.idAttribute) {
|
|
delete this._byId[model.previous(model.idAttribute)];
|
|
if (model.id != null) this._byId[model.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 methods = ['forEach', 'each', 'map', 'collect', 'reduce', 'foldl',
|
|
'inject', 'reduceRight', 'foldr', 'find', 'detect', 'filter', 'select',
|
|
'reject', 'every', 'all', 'some', 'any', 'include', 'contains', 'invoke',
|
|
'max', 'min', 'toArray', 'size', 'first', 'head', 'take', 'initial', 'rest',
|
|
'tail', 'drop', 'last', 'without', 'difference', 'indexOf', 'shuffle',
|
|
'lastIndexOf', 'isEmpty', 'chain', 'sample'];
|
|
|
|
// Mix in each Underscore method as a proxy to `Collection#models`.
|
|
_.each(methods, function(method) {
|
|
Collection.prototype[method] = function() {
|
|
var args = slice.call(arguments);
|
|
args.unshift(this.models);
|
|
return _[method].apply(_, args);
|
|
};
|
|
});
|
|
|
|
// Underscore methods that take a property name as an argument.
|
|
var attributeMethods = ['groupBy', 'countBy', 'sortBy', 'indexBy'];
|
|
|
|
// Use attributes instead of properties.
|
|
_.each(attributeMethods, function(method) {
|
|
Collection.prototype[method] = function(value, context) {
|
|
var iterator = _.isFunction(value) ? value : function(model) {
|
|
return model.get(value);
|
|
};
|
|
return _[method](this.models, iterator, context);
|
|
};
|
|
});
|
|
|
|
// 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');
|
|
options || (options = {});
|
|
_.extend(this, _.pick(options, viewOptions));
|
|
this._ensureElement();
|
|
this.initialize.apply(this, arguments);
|
|
this.delegateEvents();
|
|
};
|
|
|
|
// Cached regex to split keys for `delegate`.
|
|
var delegateEventSplitter = /^(\S+)\s*(.*)$/;
|
|
|
|
// List of view options to be merged 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.$el.remove();
|
|
this.stopListening();
|
|
return this;
|
|
},
|
|
|
|
// Change the view's element (`this.el` property), including event
|
|
// re-delegation.
|
|
setElement: function(element, delegate) {
|
|
if (this.$el) this.undelegateEvents();
|
|
this.$el = element instanceof Backbone.$ ? element : Backbone.$(element);
|
|
this.el = this.$el[0];
|
|
if (delegate !== false) this.delegateEvents();
|
|
return this;
|
|
},
|
|
|
|
// 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`.
|
|
// This only works for delegate-able events: not `focus`, `blur`, and
|
|
// not `change`, `submit`, and `reset` in Internet Explorer.
|
|
delegateEvents: function(events) {
|
|
if (!(events || (events = _.result(this, 'events')))) return this;
|
|
this.undelegateEvents();
|
|
for (var key in events) {
|
|
var method = events[key];
|
|
if (!_.isFunction(method)) method = this[events[key]];
|
|
if (!method) continue;
|
|
|
|
var match = key.match(delegateEventSplitter);
|
|
var eventName = match[1], selector = match[2];
|
|
method = _.bind(method, this);
|
|
eventName += '.delegateEvents' + this.cid;
|
|
if (selector === '') {
|
|
this.$el.on(eventName, method);
|
|
} else {
|
|
this.$el.on(eventName, selector, method);
|
|
}
|
|
}
|
|
return this;
|
|
},
|
|
|
|
// Clears all callbacks previously bound to the view with `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() {
|
|
this.$el.off('.delegateEvents' + this.cid);
|
|
return this;
|
|
},
|
|
|
|
// Ensure that the View has a DOM element to render into.
|
|
// If `this.el` is a string, pass it through `$()`, 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');
|
|
var $el = Backbone.$('<' + _.result(this, 'tagName') + '>').attr(attrs);
|
|
this.setElement($el, false);
|
|
} else {
|
|
this.setElement(_.result(this, 'el'), false);
|
|
}
|
|
}
|
|
|
|
});
|
|
|
|
// 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;
|
|
}
|
|
|
|
// If we're sending a `PATCH` request, and we're in an old Internet Explorer
|
|
// that still has ActiveX enabled by default, override jQuery to use that
|
|
// for XHR instead. Remove this line when jQuery supports `PATCH` on IE8.
|
|
if (params.type === 'PATCH' && noXhrPatch) {
|
|
params.xhr = function() {
|
|
return new ActiveXObject("Microsoft.XMLHTTP");
|
|
};
|
|
}
|
|
|
|
// 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;
|
|
};
|
|
|
|
var noXhrPatch =
|
|
typeof window !== 'undefined' && !!window.ActiveXObject &&
|
|
!(window.XMLHttpRequest && (new XMLHttpRequest).dispatchEvent);
|
|
|
|
// 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);
|
|
router.execute(callback, args);
|
|
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) {
|
|
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 = [];
|
|
_.bindAll(this, 'checkUrl');
|
|
|
|
// 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 detecting MSIE.
|
|
var isExplorer = /msie [\w.]+/;
|
|
|
|
// Cached regex for removing a trailing slash.
|
|
var trailingSlash = /\/$/;
|
|
|
|
// Cached regex for stripping urls of hash.
|
|
var pathStripper = /#.*$/;
|
|
|
|
// 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() {
|
|
return this.location.pathname.replace(/[^\/]$/, '$&/') === this.root;
|
|
},
|
|
|
|
// 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(/#(.*)$/);
|
|
return match ? match[1] : '';
|
|
},
|
|
|
|
// Get the cross-browser normalized URL fragment, either from the URL,
|
|
// the hash, or the override.
|
|
getFragment: function(fragment, forcePushState) {
|
|
if (fragment == null) {
|
|
if (this._hasPushState || !this._wantsHashChange || forcePushState) {
|
|
fragment = decodeURI(this.location.pathname + this.location.search);
|
|
var root = this.root.replace(trailingSlash, '');
|
|
if (!fragment.indexOf(root)) fragment = fragment.slice(root.length);
|
|
} else {
|
|
fragment = this.getHash();
|
|
}
|
|
}
|
|
return fragment.replace(routeStripper, '');
|
|
},
|
|
|
|
// Start the hash change handling, returning `true` if the current URL matches
|
|
// an existing route, and `false` otherwise.
|
|
start: function(options) {
|
|
if (History.started) throw new Error("Backbone.history has already been started");
|
|
History.started = true;
|
|
|
|
// Figure out the initial configuration. Do we need an iframe?
|
|
// Is pushState desired ... is it available?
|
|
this.options = _.extend({root: '/'}, this.options, options);
|
|
this.root = this.options.root;
|
|
this._wantsHashChange = this.options.hashChange !== false;
|
|
this._wantsPushState = !!this.options.pushState;
|
|
this._hasPushState = !!(this.options.pushState && this.history && this.history.pushState);
|
|
var fragment = this.getFragment();
|
|
var docMode = document.documentMode;
|
|
var oldIE = (isExplorer.exec(navigator.userAgent.toLowerCase()) && (!docMode || docMode <= 7));
|
|
|
|
// Normalize root to always include a leading and trailing slash.
|
|
this.root = ('/' + this.root + '/').replace(rootStripper, '/');
|
|
|
|
if (oldIE && this._wantsHashChange) {
|
|
var frame = Backbone.$('<iframe src="javascript:0" tabindex="-1">');
|
|
this.iframe = frame.hide().appendTo('body')[0].contentWindow;
|
|
this.navigate(fragment);
|
|
}
|
|
|
|
// Depending on whether we're using pushState or hashes, and whether
|
|
// 'onhashchange' is supported, determine how we check the URL state.
|
|
if (this._hasPushState) {
|
|
Backbone.$(window).on('popstate', this.checkUrl);
|
|
} else if (this._wantsHashChange && ('onhashchange' in window) && !oldIE) {
|
|
Backbone.$(window).on('hashchange', this.checkUrl);
|
|
} else if (this._wantsHashChange) {
|
|
this._checkUrlInterval = setInterval(this.checkUrl, this.interval);
|
|
}
|
|
|
|
// Determine if we need to change the base url, for a pushState link
|
|
// opened by a non-pushState browser.
|
|
this.fragment = fragment;
|
|
var loc = this.location;
|
|
|
|
// 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()) {
|
|
this.fragment = this.getFragment(null, true);
|
|
this.location.replace(this.root + '#' + this.fragment);
|
|
// 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() && loc.hash) {
|
|
this.fragment = this.getHash().replace(routeStripper, '');
|
|
this.history.replaceState({}, document.title, this.root + this.fragment);
|
|
}
|
|
|
|
}
|
|
|
|
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() {
|
|
Backbone.$(window).off('popstate', this.checkUrl).off('hashchange', this.checkUrl);
|
|
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 (current === this.fragment && this.iframe) {
|
|
current = this.getFragment(this.getHash(this.iframe));
|
|
}
|
|
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) {
|
|
fragment = this.fragment = this.getFragment(fragment);
|
|
return _.any(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};
|
|
|
|
var url = this.root + (fragment = this.getFragment(fragment || ''));
|
|
|
|
// Strip the hash for matching.
|
|
fragment = fragment.replace(pathStripper, '');
|
|
|
|
if (this.fragment === fragment) return;
|
|
this.fragment = fragment;
|
|
|
|
// Don't include a trailing slash on the root.
|
|
if (fragment === '' && url !== '/') url = url.slice(0, -1);
|
|
|
|
// If pushState is available, we use it to set the fragment as a real URL.
|
|
if (this._hasPushState) {
|
|
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.getFragment(this.getHash(this.iframe)))) {
|
|
// 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) this.iframe.document.open().close();
|
|
this._updateHash(this.iframe.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's 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`'s 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(model, resp, options);
|
|
model.trigger('error', model, resp, options);
|
|
};
|
|
};
|
|
|
|
return Backbone;
|
|
|
|
}));
|