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- <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
- <meta http-equiv="X-UA-Compatible" content="chrome=1">
- <title>Backbone.js</title>
- <style>
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- color: black;
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- position: relative;
- width: 550px;
- margin: 40px 0 50px 260px;
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- margin: 0px 0 30px;
- }
- img.example_image {
- margin: 0px auto;
- }
- </style>
- </head>
- <body>
- <div id="sidebar" class="interface">
- <a class="toc_title" href="#">
- Backbone.js <span class="version">(0.5.3)</span>
- </a>
- <a class="toc_title" href="#Introduction">
- Introduction
- </a>
- <a class="toc_title" href="#Events">
- Events
- </a>
- <ul class="toc_section">
- <li>– <a href="#Events-bind">bind</a></li>
- <li>– <a href="#Events-unbind">unbind</a></li>
- <li>– <a href="#Events-trigger">trigger</a></li>
- </ul>
- <a class="toc_title" href="#Model">
- Model
- </a>
- <ul class="toc_section">
- <li>– <a href="#Model-extend">extend</a></li>
- <li>– <a href="#Model-constructor">constructor / initialize</a></li>
- <li>– <a href="#Model-get">get</a></li>
- <li>– <a href="#Model-set">set</a></li>
- <li>– <a href="#Model-escape">escape</a></li>
- <li>– <a href="#Model-has">has</a></li>
- <li>– <a href="#Model-unset">unset</a></li>
- <li>– <a href="#Model-clear">clear</a></li>
- <li>– <a href="#Model-id">id</a></li>
- <li>– <a href="#Model-idAttribute">idAttribute</a></li>
- <li>– <a href="#Model-cid">cid</a></li>
- <li>– <a href="#Model-attributes">attributes</a></li>
- <li>– <a href="#Model-defaults">defaults</a></li>
- <li>- <a href="#Model-toJSON">toJSON</a></li>
- <li>– <a href="#Model-fetch">fetch</a></li>
- <li>– <a href="#Model-save">save</a></li>
- <li>– <a href="#Model-destroy">destroy</a></li>
- <li>– <a href="#Model-validate">validate</a></li>
- <li>– <a href="#Model-url">url</a></li>
- <li>– <a href="#Model-urlRoot">urlRoot</a></li>
- <li>– <a href="#Model-parse">parse</a></li>
- <li>– <a href="#Model-clone">clone</a></li>
- <li>– <a href="#Model-isNew">isNew</a></li>
- <li>– <a href="#Model-change">change</a></li>
- <li>– <a href="#Model-hasChanged">hasChanged</a></li>
- <li>– <a href="#Model-changedAttributes">changedAttributes</a></li>
- <li>– <a href="#Model-previous">previous</a></li>
- <li>– <a href="#Model-previousAttributes">previousAttributes</a></li>
- </ul>
- <a class="toc_title" href="#Collection">
- Collection
- </a>
- <ul class="toc_section">
- <li>– <a href="#Collection-extend">extend</a></li>
- <li>– <a href="#Collection-model">model</a></li>
- <li>– <a href="#Collection-constructor">constructor / initialize</a></li>
- <li>– <a href="#Collection-models">models</a></li>
- <li>– <a href="#Collection-toJSON">toJSON</a></li>
- <li>– <a href="#Collection-Underscore-Methods"><b>Underscore Methods (26)</b></a></li>
- <li>– <a href="#Collection-add">add</a></li>
- <li>– <a href="#Collection-remove">remove</a></li>
- <li>– <a href="#Collection-get">get</a></li>
- <li>– <a href="#Collection-getByCid">getByCid</a></li>
- <li>– <a href="#Collection-at">at</a></li>
- <li>– <a href="#Collection-length">length</a></li>
- <li>– <a href="#Collection-comparator">comparator</a></li>
- <li>– <a href="#Collection-sort">sort</a></li>
- <li>– <a href="#Collection-pluck">pluck</a></li>
- <li>– <a href="#Collection-url">url</a></li>
- <li>– <a href="#Collection-parse">parse</a></li>
- <li>– <a href="#Collection-fetch">fetch</a></li>
- <li>– <a href="#Collection-reset">reset</a></li>
- <li>– <a href="#Collection-create">create</a></li>
- </ul>
- <a class="toc_title" href="#Router">
- Router
- </a>
- <ul class="toc_section">
- <li>– <a href="#Router-extend">extend</a></li>
- <li>– <a href="#Router-routes">routes</a></li>
- <li>– <a href="#Router-constructor">constructor / initialize</a></li>
- <li>– <a href="#Router-route">route</a></li>
- <li>– <a href="#Router-navigate">navigate</a></li>
- </ul>
- <a class="toc_title" href="#History">
- History
- </a>
- <ul class="toc_section">
- <li>– <a href="#History-start">start</a></li>
- </ul>
- <a class="toc_title" href="#Sync">
- Sync
- </a>
- <ul class="toc_section">
- <li>– <a href="#Sync">Backbone.sync</a></li>
- <li>– <a href="#Sync-emulateHTTP">Backbone.emulateHTTP</a></li>
- <li>– <a href="#Sync-emulateJSON">Backbone.emulateJSON</a></li>
- </ul>
- <a class="toc_title" href="#View">
- View
- </a>
- <ul class="toc_section">
- <li>– <a href="#View-extend">extend</a></li>
- <li>– <a href="#View-constructor">constructor / initialize</a></li>
- <li>– <a href="#View-el">el</a></li>
- <li>– <a href="#View-dollar">$ (jQuery or Zepto)</a></li>
- <li>– <a href="#View-render">render</a></li>
- <li>– <a href="#View-remove">remove</a></li>
- <li>– <a href="#View-make">make</a></li>
- <li>– <a href="#View-delegateEvents">delegateEvents</a></li>
- </ul>
- <a class="toc_title" href="#Utility">
- Utility
- </a>
- <ul class="toc_section">
- <li>– <a href="#Utility-noConflict">noConflict</a></li>
- </ul>
- <a class="toc_title" href="#examples">
- Examples
- </a>
- <ul class="toc_section">
- <li>– <a href="#examples-todos">Todos</a></li>
- <li>– <a href="#examples-documentcloud">DocumentCloud</a></li>
- <li>– <a href="#examples-linkedin">LinkedIn Mobile</a></li>
- <li>– <a href="#examples-flow">Flow</a></li>
- <li>– <a href="#examples-audiovroom">AudioVroom</a></li>
- <li>– <a href="#examples-foursquare">Foursquare</a></li>
- <li>– <a href="#examples-do">Do</a></li>
- <li>– <a href="#examples-posterous">Posterous Spaces</a></li>
- <li>– <a href="#examples-groupon">Groupon Now!</a></li>
- <li>– <a href="#examples-basecamp">Basecamp Mobile</a></li>
- <li>– <a href="#examples-slavery-footprint">Slavery Footprint</a></li>
- <li>– <a href="#examples-diaspora">Diaspora</a></li>
- <li>– <a href="#examples-trajectory">Trajectory</a></li>
- <li>– <a href="#examples-soundcloud">SoundCloud Mobile</a></li>
- <li>– <a href="#examples-pandora">Pandora</a></li>
- <li>– <a href="#examples-cloudapp">CloudApp</a></li>
- <li>– <a href="#examples-seatgeek">SeatGeek</a></li>
- <li>– <a href="#examples-grove">Grove.io</a></li>
- <li>– <a href="#examples-kicksend">Kicksend</a></li>
- <li>– <a href="#examples-shortmail">Shortmail</a></li>
- <li>– <a href="#examples-battlefield">Battlefield Play4Free</a></li>
- <li>– <a href="#examples-salon">Salon.io</a></li>
- <li>– <a href="#examples-quoteroller">Quote Roller</a></li>
- <li>– <a href="#examples-tilemill">TileMill</a></li>
- <li>– <a href="#examples-rround">rround.me</a></li>
- <li>- <a href="#examples-blossom">Blossom</a></li>
- <li>- <a href="#examples-instagreat">Insta-great!</a></li>
- <li>- <a href="#examples-decide">Decide</a></li>
- <li>- <a href="#examples-trello">Trello</a></li>
- <li>- <a href="#examples-bittorrent">BitTorrent</a></li>
- <li>- <a href="#examples-picplum">Picplum</a></li>
- <li>- <a href="#examples-ducksboard">Ducksboard</a></li>
- <li>- <a href="#examples-quietwrite">QuietWrite</a></li>
- <li>- <a href="#examples-tzigla">Tzigla</a></li>
- </ul>
- <a class="toc_title" href="#faq">
- F.A.Q.
- </a>
- <ul class="toc_section">
- <li>– <a href="#FAQ-events">Catalog of Events</a></li>
- <li>– <a href="#FAQ-tim-toady">More Than One Way To Do It</a></li>
- <li>– <a href="#FAQ-nested">Nested Models & Collections</a></li>
- <li>– <a href="#FAQ-bootstrap">Loading Bootstrapped Models</a></li>
- <li>– <a href="#FAQ-mvc">Traditional MVC</a></li>
- <li>– <a href="#FAQ-this">Binding "this"</a></li>
- </ul>
- <a class="toc_title" href="#changelog">
- Change Log
- </a>
- </div>
- <div class="container">
- <p>
- <img style="width: 451px; height: 80px;" src="docs/images/backbone.png" alt="Backbone.js" />
- </p>
- <p>
- <a href="http://github.com/documentcloud/backbone/">Backbone</a>
- supplies structure to JavaScript-heavy applications by providing <b>models</b> with
- key-value binding and custom events, <b>collections</b> with a rich API of enumerable functions,
- <b>views</b> with declarative event handling, and connects it all to your
- existing application over a RESTful JSON interface.
- </p>
- <p>
- The project is <a href="http://github.com/documentcloud/backbone/">hosted on GitHub</a>,
- and the <a href="docs/backbone.html">annotated source code</a> is available,
- as well as an online <a href="test/test.html">test suite</a>, an
- <a href="examples/todos/index.html">example application</a> and a
- <a href="https://github.com/documentcloud/backbone/wiki/Tutorials%2C-blog-posts-and-example-sites">list of tutorials</a>.
- </p>
- <p>
- You can report bugs and discuss features on the
- <a href="http://github.com/documentcloud/backbone/issues">GitHub issues page</a>,
- on Freenode IRC in the <tt>#documentcloud</tt> channel, post questions to the
- <a href="https://groups.google.com/forum/#!forum/backbonejs">Google Group</a>,
- or send tweets to <a href="http://twitter.com/documentcloud">@documentcloud</a>.
- </p>
- <p>
- <i>
- Backbone is an open-source component of
- <a href="http://documentcloud.org/">DocumentCloud</a>.
- </i>
- </p>
- <h2 id="downloads">
- Downloads & Dependencies
- <span style="padding-left: 7px; font-size:11px; font-weight: normal;" class="interface">(Right-click, and use "Save As")</span>
- </h2>
- <table>
- <tr>
- <td><a href="backbone.js">Development Version (0.5.3)</a></td>
- <td><i>41kb, Full Source with Comments</i></td>
- </tr>
- <tr>
- <td><a href="backbone-min.js">Production Version (0.5.3)</a></td>
- <td><i>4.6kb, Packed and Gzipped</i></td>
- </tr>
- </table>
- <p>
- Backbone's only hard dependency is
- <a href="http://documentcloud.github.com/underscore/">Underscore.js</a>.
- For RESTful persistence, history support via <a href="#Router">Backbone.Router</a>
- and DOM manipulation with <a href="#View">Backbone.View</a>, include
- <a href="https://github.com/douglascrockford/JSON-js">json2.js</a>, and either
- <a href="http://jquery.com">jQuery</a> <small>( > 1.4.2)</small> or
- <a href="http://zeptojs.com/">Zepto</a>.
- </p>
- <h2 id="Introduction">Introduction</h2>
- <p>
- When working on a web application that involves a lot of JavaScript, one
- of the first things you learn is to stop tying your data to the DOM. It's all
- too easy to create JavaScript applications that end up as tangled piles of
- jQuery selectors and callbacks, all trying frantically to keep data in
- sync between the HTML UI, your JavaScript logic, and the database on your
- server. For rich client-side applications, a more structured approach
- is often helpful.
- </p>
- <p>
- With Backbone, you represent your data as
- <a href="#Model">Models</a>, which can be created, validated, destroyed,
- and saved to the server. Whenever a UI action causes an attribute of
- a model to change, the model triggers a <i>"change"</i> event; all
- the <a href="#View">Views</a> that display the model's state can be notified of the
- change, so that they are able to respond accordingly, re-rendering themselves with
- the new information. In a finished Backbone app, you don't have to write the glue
- code that looks into the DOM to find an element with a specific <i>id</i>,
- and update the HTML manually
- — when the model changes, the views simply update themselves.
- </p>
- <p>
- Many of the examples that follow are runnable. Click the <i>play</i> button
- to execute them.
- </p>
- <h2 id="Events">Backbone.Events</h2>
- <p>
- <b>Events</b> is a module that can be mixed in to any object, giving the
- object the ability to bind and trigger custom named events. Events do not
- have to be declared before they are bound, and may take passed arguments.
- For example:
- </p>
- <pre class="runnable">
- var object = {};
- _.extend(object, Backbone.Events);
- object.bind("alert", function(msg) {
- alert("Triggered " + msg);
- });
- object.trigger("alert", "an event");
- </pre>
- <p id="Events-bind">
- <b class="header">bind</b><code>object.bind(event, callback, [context])</code>
- <br />
- Bind a <b>callback</b> function to an object. The callback will be invoked
- whenever the <b>event</b> (specified by an arbitrary string identifier) is fired.
- If you have a large number of different events on a page, the convention is to use colons to
- namespace them: <tt>"poll:start"</tt>, or <tt>"change:selection"</tt>
- </p>
- <p>
- To supply a <b>context</b> value for <tt>this</tt> when the callback is invoked,
- pass the optional third argument: <tt>model.bind('change', this.render, this)</tt>
- </p>
- <p>
- Callbacks bound to the special
- <tt>"all"</tt> event will be triggered when any event occurs, and are passed
- the name of the event as the first argument. For example, to proxy all events
- from one object to another:
- </p>
- <pre>
- proxy.bind("all", function(eventName) {
- object.trigger(eventName);
- });
- </pre>
- <p id="Events-unbind">
- <b class="header">unbind</b><code>object.unbind([event], [callback])</code>
- <br />
- Remove a previously-bound <b>callback</b> function from an object. If no
- callback is specified, all callbacks for the <b>event</b> will be
- removed. If no event is specified, <i>all</i> event callbacks on the object
- will be removed.
- </p>
- <pre>
- object.unbind("change", onChange); // Removes just the onChange callback.
- object.unbind("change"); // Removes all "change" callbacks.
- object.unbind(); // Removes all callbacks on object.
- </pre>
- <p id="Events-trigger">
- <b class="header">trigger</b><code>object.trigger(event, [*args])</code>
- <br />
- Trigger callbacks for the given <b>event</b>. Subsequent arguments to
- <b>trigger</b> will be passed along to the event callbacks.
- </p>
- <h2 id="Model">Backbone.Model</h2>
- <p>
- <b>Models</b> are the heart of any JavaScript application, containing
- the interactive data as well as a large part of the logic surrounding it:
- conversions, validations, computed properties, and access control. You
- extend <b>Backbone.Model</b> with your domain-specific methods, and
- <b>Model</b> provides a basic set of functionality for managing changes.
- </p>
- <p>
- The following is a contrived example, but it demonstrates defining a model
- with a custom method, setting an attribute, and firing an event keyed
- to changes in that specific attribute.
- After running this code once, <tt>sidebar</tt> will be
- available in your browser's console, so you can play around with it.
- </p>
- <pre class="runnable">
- var Sidebar = Backbone.Model.extend({
- promptColor: function() {
- var cssColor = prompt("Please enter a CSS color:");
- this.set({color: cssColor});
- }
- });
- window.sidebar = new Sidebar;
- sidebar.bind('change:color', function(model, color) {
- $('#sidebar').css({background: color});
- });
- sidebar.set({color: 'white'});
- sidebar.promptColor();
- </pre>
- <p id="Model-extend">
- <b class="header">extend</b><code>Backbone.Model.extend(properties, [classProperties])</code>
- <br />
- To create a <b>Model</b> class of your own, you extend <b>Backbone.Model</b>
- and provide instance <b>properties</b>, as well as optional
- <b>classProperties</b> to be attached directly to the constructor function.
- </p>
- <p>
- <b>extend</b> correctly sets up the prototype chain, so subclasses created
- with <b>extend</b> can be further extended and subclassed as far as you like.
- </p>
- <pre>
- var Note = Backbone.Model.extend({
- initialize: function() { ... },
- author: function() { ... },
- coordinates: function() { ... },
- allowedToEdit: function(account) {
- return true;
- }
- });
- var PrivateNote = Note.extend({
- allowedToEdit: function(account) {
- return account.owns(this);
- }
- });
- </pre>
- <p class="warning">
- Brief aside on <tt>super</tt>: JavaScript does not provide
- a simple way to call super — the function of the same name defined
- higher on the prototype chain. If you override a core function like
- <tt>set</tt>, or <tt>save</tt>, and you want to invoke the
- parent object's implementation, you'll have to explicitly call it, along these lines:
- </p>
- <pre>
- var Note = Backbone.Model.extend({
- set: function(attributes, options) {
- Backbone.Model.prototype.set.call(this, attributes, options);
- ...
- }
- });
- </pre>
- <p id="Model-constructor">
- <b class="header">constructor / initialize</b><code>new Model([attributes])</code>
- <br />
- When creating an instance of a model, you can pass in the initial values
- of the <b>attributes</b>, which will be <a href="#Model-set">set</a> on the
- model. If you define an <b>initialize</b> function, it will be invoked when
- the model is created.
- </p>
- <pre>
- new Book({
- title: "One Thousand and One Nights",
- author: "Scheherazade"
- });
- </pre>
- <p id="Model-get">
- <b class="header">get</b><code>model.get(attribute)</code>
- <br />
- Get the current value of an attribute from the model. For example:
- <tt>note.get("title")</tt>
- </p>
- <p id="Model-set">
- <b class="header">set</b><code>model.set(attributes, [options])</code>
- <br />
- Set a hash of attributes (one or many) on the model. If any of the attributes
- change the models state, a <tt>"change"</tt> event will be triggered, unless
- <tt>{silent: true}</tt> is passed as an option. Change events for specific
- attributes are also triggered, and you can bind to those as well, for example:
- <tt>change:title</tt>, and <tt>change:content</tt>.
- </p>
- <pre>
- note.set({title: "October 12", content: "Lorem Ipsum Dolor Sit Amet..."});
- </pre>
- <p>
- If the model has a <a href="#Model-validate">validate</a> method,
- it will be validated before the attributes are set, no changes will
- occur if the validation fails, and <b>set</b> will return <tt>false</tt>.
- Otherwise, <b>set</b> returns a reference to the model.
- You may also pass an <tt>error</tt>
- callback in the options, which will be invoked instead of triggering an
- <tt>"error"</tt> event, should validation fail.
- </p>
- <p id="Model-escape">
- <b class="header">escape</b><code>model.escape(attribute)</code>
- <br />
- Similar to <a href="#Model-get">get</a>, but returns the HTML-escaped version
- of a model's attribute. If you're interpolating data from the model into
- HTML, using <b>escape</b> to retrieve attributes will prevent
- <a href="http://en.wikipedia.org/wiki/Cross-site_scripting">XSS</a> attacks.
- </p>
- <pre class="runnable">
- var hacker = new Backbone.Model({
- name: "<script>alert('xss')</script>"
- });
- alert(hacker.escape('name'));
- </pre>
- <p id="Model-has">
- <b class="header">has</b><code>model.has(attribute)</code>
- <br />
- Returns <tt>true</tt> if the attribute is set to a non-null or non-undefined
- value.
- </p>
- <pre>
- if (note.has("title")) {
- ...
- }
- </pre>
- <p id="Model-unset">
- <b class="header">unset</b><code>model.unset(attribute, [options])</code>
- <br />
- Remove an attribute by deleting it from the internal attributes hash.
- Fires a <tt>"change"</tt> event unless <tt>silent</tt> is passed as an option.
- </p>
- <p id="Model-clear">
- <b class="header">clear</b><code>model.clear([options])</code>
- <br />
- Removes all attributes from the model. Fires a <tt>"change"</tt> event unless
- <tt>silent</tt> is passed as an option.
- </p>
- <p id="Model-id">
- <b class="header">id</b><code>model.id</code>
- <br />
- A special property of models, the <b>id</b> is an arbitrary string
- (integer id or UUID). If you set the <b>id</b> in the
- attributes hash, it will be copied onto the model as a direct property.
- Models can be retrieved by id from collections, and the id is used to generate
- model URLs by default.
- </p>
- <p id="Model-idAttribute">
- <b class="header">idAttribute</b><code>model.idAttribute</code>
- <br />
- A model's unique identifier is stored under the <tt>id</tt> attribute.
- If you're directly communicating with a backend (CouchDB, MongoDB) that uses
- a different unique key, you may set a Model's <tt>idAttribute</tt> to
- transparently map from that key to <tt>id</tt>.
- <pre class="runnable">
- var Meal = Backbone.Model.extend({
- idAttribute: "_id"
- });
- var cake = new Meal({ _id: 1, name: "Cake" });
- alert("Cake id: " + cake.id);
- </pre>
- </p>
- <p id="Model-cid">
- <b class="header">cid</b><code>model.cid</code>
- <br />
- A special property of models, the <b>cid</b> or client id is a unique identifier
- automatically assigned to all models when they're first created. Client ids
- are handy when the model has not yet been saved to the server, and does not
- yet have its eventual true <b>id</b>, but already needs to be visible in the UI.
- Client ids take the form: <tt>c1, c2, c3 ...</tt>
- </p>
- <p id="Model-attributes">
- <b class="header">attributes</b><code>model.attributes</code>
- <br />
- The <b>attributes</b> property is the internal hash containing the model's
- state. Please use <a href="#Model-set">set</a> to update the attributes instead of modifying
- them directly. If you'd like to retrieve and munge a copy of the model's
- attributes, use <a href="#Model-toJSON">toJSON</a> instead.
- </p>
- <p id="Model-defaults">
- <b class="header">defaults</b><code>model.defaults or model.defaults()</code>
- <br />
- The <b>defaults</b> hash (or function) can be used to specify the default
- attributes for your model. When creating an instance of the model,
- any unspecified attributes will be set to their default value.
- </p>
- <pre class="runnable">
- var Meal = Backbone.Model.extend({
- defaults: {
- "appetizer": "caesar salad",
- "entree": "ravioli",
- "dessert": "cheesecake"
- }
- });
- alert("Dessert will be " + (new Meal).get('dessert'));
- </pre>
- <p class="warning">
- Remember that in JavaScript, objects are passed by reference, so if you
- include an object as a default value, it will be shared among all instances.
- </p>
- <p id="Model-toJSON">
- <b class="header">toJSON</b><code>model.toJSON()</code>
- <br />
- Return a copy of the model's <a href="#Model-attributes">attributes</a> for JSON stringification.
- This can be used for persistence, serialization, or for augmentation before
- being handed off to a view. The name of this method is a bit confusing, as
- it doesn't actually return a JSON string — but I'm afraid that it's
- the way that the <a href="https://developer.mozilla.org/en/JSON#toJSON()_method">JavaScript API for <b>JSON.stringify</b> works</a>.
- </p>
- <pre class="runnable">
- var artist = new Backbone.Model({
- firstName: "Wassily",
- lastName: "Kandinsky"
- });
- artist.set({birthday: "December 16, 1866"});
- alert(JSON.stringify(artist));
- </pre>
- <p id="Model-fetch">
- <b class="header">fetch</b><code>model.fetch([options])</code>
- <br />
- Resets the model's state from the server. Useful if the model has never
- been populated with data, or if you'd like to ensure that you have the
- latest server state. A <tt>"change"</tt> event will be triggered if the
- server's state differs from the current attributes. Accepts
- <tt>success</tt> and <tt>error</tt> callbacks in the options hash, which
- are passed <tt>(model, response)</tt> as arguments.
- </p>
- <pre>
- // Poll every 10 seconds to keep the channel model up-to-date.
- setInterval(function() {
- channel.fetch();
- }, 10000);
- </pre>
- <p id="Model-save">
- <b class="header">save</b><code>model.save([attributes], [options])</code>
- <br />
- Save a model to your database (or alternative persistence layer),
- by delegating to <a href="#Sync">Backbone.sync</a>. The <b>attributes</b>
- hash (as in <a href="#Model-set">set</a>) should contain the attributes
- you'd like to change -- keys that aren't mentioned won't be altered.
- If the model has a <a href="#Model-validate">validate</a>
- method, and validation fails, the model will not be saved. If the model
- <a href="#Model-isNew">isNew</a>, the save will be a <tt>"create"</tt>
- (HTTP <tt>POST</tt>), if the model already
- exists on the server, the save will be an <tt>"update"</tt> (HTTP <tt>PUT</tt>).
- </p>
- <p>
- In the following example, notice how our overridden version
- of <tt>Backbone.sync</tt> receives a <tt>"create"</tt> request
- the first time the model is saved and an <tt>"update"</tt>
- request the second time.
- </p>
- <pre class="runnable">
- Backbone.sync = function(method, model) {
- alert(method + ": " + JSON.stringify(model));
- model.id = 1;
- };
- var book = new Backbone.Model({
- title: "The Rough Riders",
- author: "Theodore Roosevelt"
- });
- book.save();
- book.save({author: "Teddy"});
- </pre>
- <p>
- <b>save</b> accepts <tt>success</tt> and <tt>error</tt> callbacks in the
- options hash, which are passed <tt>(model, response)</tt> as arguments.
- The <tt>error</tt> callback will also be invoked if the model has a
- <tt>validate</tt> method, and validation fails. If a server-side
- validation fails, return a non-<tt>200</tt> HTTP response code, along with
- an error response in text or JSON.
- </p>
- <pre>
- book.save({author: "F.D.R."}, {error: function(){ ... }});
- </pre>
- <p id="Model-destroy">
- <b class="header">destroy</b><code>model.destroy([options])</code>
- <br />
- Destroys the model on the server by delegating an HTTP <tt>DELETE</tt>
- request to <a href="#Sync">Backbone.sync</a>. Accepts
- <tt>success</tt> and <tt>error</tt> callbacks in the options hash.
- Triggers a <tt>"destroy"</tt> event on the model, which will bubble up
- through any collections that contain it.
- </p>
- <pre>
- book.destroy({success: function(model, response) {
- ...
- }});
- </pre>
- <p id="Model-validate">
- <b class="header">validate</b><code>model.validate(attributes)</code>
- <br />
- This method is left undefined, and you're encouraged to override it with
- your custom validation logic, if you have any that can be performed
- in JavaScript. <b>validate</b> is called before <tt>set</tt> and
- <tt>save</tt>, and is passed the attributes that are about to be updated.
- If the model and attributes are valid, don't return anything from <b>validate</b>;
- if the attributes are invalid, return an error of your choosing. It
- can be as simple as a string error message to be displayed, or a complete
- error object that describes the error programmatically. <tt>set</tt> and
- <tt>save</tt> will not continue if <b>validate</b> returns an error.
- Failed validations trigger an <tt>"error"</tt> event.
- </p>
- <pre class="runnable">
- var Chapter = Backbone.Model.extend({
- validate: function(attrs) {
- if (attrs.end < attrs.start) {
- return "can't end before it starts";
- }
- }
- });
- var one = new Chapter({
- title : "Chapter One: The Beginning"
- });
- one.bind("error", function(model, error) {
- alert(model.get("title") + " " + error);
- });
- one.set({
- start: 15,
- end: 10
- });
- </pre>
- <p>
- <tt>"error"</tt> events are useful for providing coarse-grained error
- messages at the model or collection level, but if you have a specific view
- that can better handle the error, you may override and suppress the event
- by passing an <tt>error</tt> callback directly:
- </p>
- <pre>
- account.set({access: "unlimited"}, {
- error: function(model, error) {
- alert(error);
- }
- });
- </pre>
- <p id="Model-url">
- <b class="header">url</b><code>model.url()</code>
- <br />
- Returns the relative URL where the model's resource would be located on
- the server. If your models are located somewhere else, override this method
- with the correct logic. Generates URLs of the form: <tt>"/[collection.url]/[id]"</tt>,
- falling back to <tt>"/[urlRoot]/id"</tt> if the model is not part of a collection.
- </p>
- <p>
- Delegates to <a href="#Collection-url">Collection#url</a> to generate the
- URL, so make sure that you have it defined, or a <a href="#Model-urlRoot">urlRoot</a>
- property, if all models of this class share a common root URL.
- A model with an id of <tt>101</tt>, stored in a
- <a href="#Collection">Backbone.Collection</a> with a <tt>url</tt> of <tt>"/documents/7/notes"</tt>,
- would have this URL: <tt>"/documents/7/notes/101"</tt>
- </p>
- <p id="Model-urlRoot">
- <b class="header">urlRoot</b><code>model.urlRoot</code>
- <br />
- Specify a <tt>urlRoot</tt> if you're using a model outside of a collection,
- to enable the default <a href="#Model-url">url</a> function to generate
- URLs based on the model id. <tt>"/[urlRoot]/id"</tt>
- </p>
- <pre class="runnable">
- var Book = Backbone.Model.extend({urlRoot : '/books'});
- var solaris = new Book({id: "1083-lem-solaris"});
- alert(solaris.url());
- </pre>
- <p id="Model-parse">
- <b class="header">parse</b><code>model.parse(response)</code>
- <br />
- <b>parse</b> is called whenever a model's data is returned by the
- server, in <a href="#Model-fetch">fetch</a>, and <a href="#Model-save">save</a>.
- The function is passed the raw <tt>response</tt> object, and should return
- the attributes hash to be <a href="#Model-set">set</a> on the model. The
- default implementation is a no-op, simply passing through the JSON response.
- Override this if you need to work with a preexisting API, or better namespace
- your responses.
- </p>
- <p>
- If you're working with a Rails backend, you'll notice that Rails' default
- <tt>to_json</tt> implementation includes a model's attributes under a
- namespace. To disable this behavior for seamless Backbone integration, set:
- </p>
- <pre>
- ActiveRecord::Base.include_root_in_json = false
- </pre>
- <p id="Model-clone">
- <b class="header">clone</b><code>model.clone()</code>
- <br />
- Returns a new instance of the model with identical attributes.
- </p>
- <p id="Model-isNew">
- <b class="header">isNew</b><code>model.isNew()</code>
- <br />
- Has this model been saved to the server yet? If the model does not yet have
- an <tt>id</tt>, it is considered to be new.
- </p>
- <p id="Model-change">
- <b class="header">change</b><code>model.change()</code>
- <br />
- Manually trigger the <tt>"change"</tt> event.
- If you've been passing <tt>{silent: true}</tt> to the <a href="#Model-set">set</a> function in order to
- aggregate rapid changes to a model, you'll want to call <tt>model.change()</tt>
- when you're all finished.
- </p>
- <p id="Model-hasChanged">
- <b class="header">hasChanged</b><code>model.hasChanged([attribute])</code>
- <br />
- Has the model changed since the last <tt>"change"</tt> event? If an <b>attribute</b>
- is passed, returns <tt>true</tt> if that specific attribute has changed.
- </p>
- <p class="warning">
- Note that this method, and the following change-related ones,
- are only useful during the course of a <tt>"change"</tt> event.
- </p>
- <pre>
- book.bind("change", function() {
- if (book.hasChanged("title")) {
- ...
- }
- });
- </pre>
- <p id="Model-changedAttributes">
- <b class="header">changedAttributes</b><code>model.changedAttributes([attributes])</code>
- <br />
- Retrieve a hash of only the model's attributes that have changed. Optionally,
- an external <b>attributes</b> hash can be passed in, returning
- the attributes in that hash which differ from the model. This can be used
- to figure out which portions of a view should be updated, or what calls
- need to be made to sync the changes to the server.
- </p>
- <p id="Model-previous">
- <b class="header">previous</b><code>model.previous(attribute)</code>
- <br />
- During a <tt>"change"</tt> event, this method can be used to get the
- previous value of a changed attribute.
- </p>
- <pre class="runnable">
- var bill = new Backbone.Model({
- name: "Bill Smith"
- });
- bill.bind("change:name", function(model, name) {
- alert("Changed name from " + bill.previous("name") + " to " + name);
- });
- bill.set({name : "Bill Jones"});
- </pre>
- <p id="Model-previousAttributes">
- <b class="header">previousAttributes</b><code>model.previousAttributes()</code>
- <br />
- Return a copy of the model's previous attributes. Useful for getting a
- diff between versions of a model, or getting back to a valid state after
- an error occurs.
- </p>
- <h2 id="Collection">Backbone.Collection</h2>
- <p>
- Collections are ordered sets of models. You can bind <tt>"change"</tt> events
- to be notified when any model in the collection has been modified,
- listen for <tt>"add"</tt> and <tt>"remove"</tt> events, <tt>fetch</tt>
- the collection from the server, and use a full suite of
- <a href="#Collection-Underscore-Methods">Underscore.js methods</a>.
- </p>
- <p>
- Any event that is triggered on a model in a collection will also be
- triggered on the collection directly, for convenience.
- This allows you to listen for changes to specific attributes in any
- model in a collection, for example:
- <tt>Documents.bind("change:selected", ...)</tt>
- </p>
- <p id="Collection-extend">
- <b class="header">extend</b><code>Backbone.Collection.extend(properties, [classProperties])</code>
- <br />
- To create a <b>Collection</b> class of your own, extend <b>Backbone.Collection</b>,
- providing instance <b>properties</b>, as well as optional <b>classProperties</b> to be attached
- directly to the collection's constructor function.
- </p>
- <p id="Collection-model">
- <b class="header">model</b><code>collection.model</code>
- <br />
- Override this property to specify the model class that the collection
- contains. If defined, you can pass raw attributes objects (and arrays) to
- <a href="#Collection-add">add</a>, <a href="#Collection-create">create</a>,
- and <a href="#Collection-reset">reset</a>, and the attributes will be
- converted into a model of the proper type.
- </p>
- <pre>
- var Library = Backbone.Collection.extend({
- model: Book
- });
- </pre>
- <p id="Collection-constructor">
- <b class="header">constructor / initialize</b><code>new Collection([models], [options])</code>
- <br />
- When creating a Collection, you may choose to pass in the initial array of <b>models</b>.
- The collection's <a href="#Collection-comparator">comparator</a> function
- may be included as an option. If you define an <b>initialize</b> function, it will be
- invoked when the collection is created.
- </p>
- <pre>
- var tabs = new TabSet([tab1, tab2, tab3]);
- </pre>
- <p id="Collection-models">
- <b class="header">models</b><code>collection.models</code>
- <br />
- Raw access to the JavaScript array of models inside of the collection. Usually you'll
- want to use <tt>get</tt>, <tt>at</tt>, or the <b>Underscore methods</b>
- to access model objects, but occasionally a direct reference to the array
- is desired.
- </p>
- <p id="Collection-toJSON">
- <b class="header">toJSON</b><code>collection.toJSON()</code>
- <br />
- Return an array containing the attributes hash of each model in the
- collection. This can be used to serialize and persist the
- collection as a whole. The name of this method is a bit confusing, because
- it conforms to
- <a href="https://developer.mozilla.org/en/JSON#toJSON()_method">JavaScript's JSON API</a>.
- </p>
- <pre class="runnable">
- var collection = new Backbone.Collection([
- {name: "Tim", age: 5},
- {name: "Ida", age: 26},
- {name: "Rob", age: 55}
- ]);
- alert(JSON.stringify(collection));
- </pre>
- <p id="Collection-Underscore-Methods">
- <b class="header">Underscore Methods (26)</b>
- <br />
- Backbone proxies to <b>Underscore.js</b> to provide 26 iteration functions
- on <b>Backbone.Collection</b>. They aren't all documented here, but
- you can take a look at the Underscore documentation for the full details…
- </p>
- <ul>
- <li><a href="http://documentcloud.github.com/underscore/#each">forEach (each)</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#map">map</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#reduce">reduce (foldl, inject)</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#reduceRight">reduceRight (foldr)</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#detect">find (detect)</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#select">filter (select)</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#reject">reject</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#all">every (all)</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#any">some (any)</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#include">include</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#invoke">invoke</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#max">max</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#min">min</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#sortBy">sortBy</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#groupBy">groupBy</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#sortedIndex">sortedIndex</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#toArray">toArray</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#size">size</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#first">first</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#rest">rest</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#last">last</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#without">without</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#indexOf">indexOf</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#lastIndexOf">lastIndexOf</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#isEmpty">isEmpty</a></li>
- <li><a href="http://documentcloud.github.com/underscore/#chain">chain</a></li>
- </ul>
- <pre>
- Books.each(function(book) {
- book.publish();
- });
- var titles = Books.map(function(book) {
- return book.get("title");
- });
- var publishedBooks = Books.filter(function(book) {
- return book.get("published") === true;
- });
- var alphabetical = Books.sortBy(function(book) {
- return book.author.get("name").toLowerCase();
- });
- </pre>
- <p id="Collection-add">
- <b class="header">add</b><code>collection.add(models, [options])</code>
- <br />
- Add a model (or an array of models) to the collection. Fires an <tt>"add"</tt>
- event, which you can pass <tt>{silent: true}</tt> to suppress. If a
- <a href="#Collection-model">model</a> property is defined, you may also pass
- raw attributes objects, and have them be vivified as instances of the model.
- Pass <tt>{at: index}</tt> to splice the model into the collection at the
- specified <tt>index</tt>.
- </p>
- <pre class="runnable">
- var ships = new Backbone.Collection;
- ships.bind("add", function(ship) {
- alert("Ahoy " + ship.get("name") + "!");
- });
- ships.add([
- {name: "Flying Dutchman"},
- {name: "Black Pearl"}
- ]);
- </pre>
- <p id="Collection-remove">
- <b class="header">remove</b><code>collection.remove(models, [options])</code>
- <br />
- Remove a model (or an array of models) from the collection. Fires a
- <tt>"remove"</tt> event, which you can use <tt>silent</tt>
- to suppress.
- </p>
- <p id="Collection-get">
- <b class="header">get</b><code>collection.get(id)</code>
- <br />
- Get a model from a collection, specified by <b>id</b>.
- </p>
- <pre>
- var book = Library.get(110);
- </pre>
- <p id="Collection-getByCid">
- <b class="header">getByCid</b><code>collection.getByCid(cid)</code>
- <br />
- Get a model from a collection, specified by client id. The client id
- is the <tt>.cid</tt> property of the model, automatically assigned whenever
- a model is created. Useful for models which have not yet been saved to
- the server, and do not yet have true ids.
- </p>
- <p id="Collection-at">
- <b class="header">at</b><code>collection.at(index)</code>
- <br />
- Get a model from a collection, specified by index. Useful if your collection
- is sorted, and if your collection isn't sorted, <b>at</b> will still
- retrieve models in insertion order.
- </p>
- <p id="Collection-length">
- <b class="header">length</b><code>collection.length</code>
- <br />
- Like an array, a Collection maintains a <tt>length</tt> property, counting
- the number of models it contains.
- </p>
- <p id="Collection-comparator">
- <b class="header">comparator</b><code>collection.comparator</code>
- <br />
- By default there is no <b>comparator</b> function on a collection.
- If you define a comparator, it will be used to maintain
- the collection in sorted order. This means that as models are added,
- they are inserted at the correct index in <tt>collection.models</tt>.
- Comparator functions take a model and return a numeric or string value
- by which the model should be ordered relative to others.
- </p>
- <p>
- Note how even though all of the chapters in this example are added backwards,
- they come out in the proper order:
- </p>
- <pre class="runnable">
- var Chapter = Backbone.Model;
- var chapters = new Backbone.Collection;
- chapters.comparator = function(chapter) {
- return chapter.get("page");
- };
- chapters.add(new Chapter({page: 9, title: "The End"}));
- chapters.add(new Chapter({page: 5, title: "The Middle"}));
- chapters.add(new Chapter({page: 1, title: "The Beginning"}));
- alert(chapters.pluck('title'));
- </pre>
- <p class="warning">
- Brief aside: This comparator function is different than JavaScript's regular
- "sort", which must return <tt>0</tt>, <tt>1</tt>, or <tt>-1</tt>,
- and is more similar to a <tt>sortBy</tt> — a much nicer API.
- </p>
- <p class="warning">
- Collections with comparator functions will not automatically re-sort if you
- later change model attributes, so you may wish to call <tt>sort</tt> after
- changing model attributes that would affect the order.
- </p>
- <p id="Collection-sort">
- <b class="header">sort</b><code>collection.sort([options])</code>
- <br />
- Force a collection to re-sort itself. You don't need to call this under
- normal circumstances, as a collection with a <a href="#Collection-comparator">comparator</a> function
- will maintain itself in proper sort order at all times. Calling <b>sort</b>
- triggers the collection's <tt>"reset"</tt> event, unless silenced by passing
- <tt>{silent: true}</tt>
- </p>
- <p id="Collection-pluck">
- <b class="header">pluck</b><code>collection.pluck(attribute)</code>
- <br />
- Pluck an attribute from each model in the collection. Equivalent to calling
- <tt>map</tt>, and returning a single attribute from the iterator.
- </p>
- <pre class="runnable">
- var stooges = new Backbone.Collection([
- new Backbone.Model({name: "Curly"}),
- new Backbone.Model({name: "Larry"}),
- new Backbone.Model({name: "Moe"})
- ]);
- var names = stooges.pluck("name");
- alert(JSON.stringify(names));
- </pre>
- <p id="Collection-url">
- <b class="header">url</b><code>collection.url or collection.url()</code>
- <br />
- Set the <b>url</b> property (or function) on a collection to reference
- its location on the server. Models within the collection will use <b>url</b>
- to construct URLs of their own.
- </p>
- <pre>
- var Notes = Backbone.Collection.extend({
- url: '/notes'
- });
- // Or, something more sophisticated:
- var Notes = Backbone.Collection.extend({
- url: function() {
- return this.document.url() + '/notes';
- }
- });
- </pre>
- <p id="Collection-parse">
- <b class="header">parse</b><code>collection.parse(response)</code>
- <br />
- <b>parse</b> is called by Backbone whenever a collection's models are
- returned by the server, in <a href="#Collection-fetch">fetch</a>.
- The function is passed the raw <tt>response</tt> object, and should return
- the array of model attributes to be <a href="#Collection-add">added</a>
- to the collection. The default implementation is a no-op, simply passing
- through the JSON response. Override this if you need to work with a
- preexisting API, or better namespace your responses.
- </p>
- <pre>
- var Tweets = Backbone.Collection.extend({
- // The Twitter Search API returns tweets under "results".
- parse: function(response) {
- return response.results;
- }
- });
- </pre>
- <p id="Collection-fetch">
- <b class="header">fetch</b><code>collection.fetch([options])</code>
- <br />
- Fetch the default set of models for this collection from the server,
- resetting the collection when they arrive. The <b>options</b> hash takes
- <tt>success</tt> and <tt>error</tt>
- callbacks which will be passed <tt>(collec…
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