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<!DOCTYPE html>
<html>
<head>
<title>backbone.js</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, target-densitydpi=160dpi, initial-scale=1.0; maximum-scale=1.0; user-scalable=0;">
<link rel="stylesheet" media="all" href="docco.css" />
</head>
<body>
<div id="container">
<div id="background"></div>
<ul class="sections">
<li id="title">
<div class="annotation">
<h1>backbone.js</h1>
</div>
</li>
<li id="section-1">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-1">¶</a>
</div>
<pre><code>Backbone.js <span class="hljs-number">1.1</span><span class="hljs-number">.2</span>
</code></pre>
</div>
</li>
<li id="section-2">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-2">¶</a>
</div>
<pre><code>(c) <span class="hljs-number">2010</span>-<span class="hljs-number">2014</span> Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
Backbone may be freely distributed under the MIT license.
For all details and documentation:
http:<span class="hljs-comment">//backbonejs.org</span>
</code></pre>
</div>
<div class="content"><div class='highlight'><pre>
(<span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(root, factory)</span> {</span></pre></div></div>
</li>
<li id="section-3">
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</div>
<p>Set up Backbone appropriately for the environment. Start with AMD.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> define === <span class="hljs-string">'function'</span> && define.amd) {
define([<span class="hljs-string">'underscore'</span>, <span class="hljs-string">'jquery'</span>, <span class="hljs-string">'exports'</span>], <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(_, $, exports)</span> {</span></pre></div></div>
</li>
<li id="section-4">
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</div>
<p>Export global even in AMD case in case this script is loaded with
others that may still expect a global Backbone.</p>
</div>
<div class="content"><div class='highlight'><pre> root.Backbone = factory(root, exports, _, $);
});</pre></div></div>
</li>
<li id="section-5">
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</div>
<p>Next for Node.js or CommonJS. jQuery may not be needed as a module.</p>
</div>
<div class="content"><div class='highlight'><pre> } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> exports !== <span class="hljs-string">'undefined'</span>) {
<span class="hljs-keyword">var</span> _ = <span class="hljs-built_in">require</span>(<span class="hljs-string">'underscore'</span>);
factory(root, exports, _);</pre></div></div>
</li>
<li id="section-6">
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</div>
<p>Finally, as a browser global.</p>
</div>
<div class="content"><div class='highlight'><pre> } <span class="hljs-keyword">else</span> {
root.Backbone = factory(root, {}, root._, (root.jQuery || root.Zepto || root.ender || root.$));
}
}(<span class="hljs-keyword">this</span>, <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(root, Backbone, _, $)</span> {</span></pre></div></div>
</li>
<li id="section-7">
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</div>
<h2 id="initial-setup">Initial Setup</h2>
</div>
</li>
<li id="section-8">
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</div>
</div>
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<p>Save the previous value of the <code>Backbone</code> variable, so that it can be
restored later on, if <code>noConflict</code> is used.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> previousBackbone = root.Backbone;</pre></div></div>
</li>
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</div>
<p>Create local references to array methods we’ll want to use later.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> array = [];
<span class="hljs-keyword">var</span> push = array.push;
<span class="hljs-keyword">var</span> slice = array.slice;
<span class="hljs-keyword">var</span> splice = array.splice;</pre></div></div>
</li>
<li id="section-11">
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<p>Current version of the library. Keep in sync with <code>package.json</code>.</p>
</div>
<div class="content"><div class='highlight'><pre> Backbone.VERSION = <span class="hljs-string">'1.1.2'</span>;</pre></div></div>
</li>
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<p>For Backbone’s purposes, jQuery, Zepto, Ender, or My Library (kidding) owns
the <code>$</code> variable.</p>
</div>
<div class="content"><div class='highlight'><pre> Backbone.$ = $;</pre></div></div>
</li>
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<p>Runs Backbone.js in <em>noConflict</em> mode, returning the <code>Backbone</code> variable
to its previous owner. Returns a reference to this Backbone object.</p>
</div>
<div class="content"><div class='highlight'><pre> Backbone.noConflict = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> {</span>
root.Backbone = previousBackbone;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
};</pre></div></div>
</li>
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<p>Turn on <code>emulateHTTP</code> to support legacy HTTP servers. Setting this option
will fake <code>"PATCH"</code>, <code>"PUT"</code> and <code>"DELETE"</code> requests via the <code>_method</code> parameter and
set a <code>X-Http-Method-Override</code> header.</p>
</div>
<div class="content"><div class='highlight'><pre> Backbone.emulateHTTP = <span class="hljs-literal">false</span>;</pre></div></div>
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<p>Turn on <code>emulateJSON</code> to support legacy servers that can’t deal with direct
<code>application/json</code> requests … will encode the body as
<code>application/x-www-form-urlencoded</code> instead and will send the model in a
form param named <code>model</code>.</p>
</div>
<div class="content"><div class='highlight'><pre> Backbone.emulateJSON = <span class="hljs-literal">false</span>;</pre></div></div>
</li>
<li id="section-16">
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</div>
<h2 id="backbone-events">Backbone.Events</h2>
</div>
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<p>A module that can be mixed in to <em>any object</em> in order to provide it with
custom events. You may bind with <code>on</code> or remove with <code>off</code> callback
functions to an event; <code>trigger</code>-ing an event fires all callbacks in
succession.</p>
<pre><code><span class="hljs-keyword">var</span> object = {};
_.extend(object, Backbone.Events);
object.on(<span class="hljs-string">'expand'</span>, <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span>{</span> alert(<span class="hljs-string">'expanded'</span>); });
object.trigger(<span class="hljs-string">'expand'</span>);
</code></pre>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> Events = Backbone.Events = {</pre></div></div>
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<p>Bind an event to a <code>callback</code> function. Passing <code>"all"</code> will bind
the callback to all events fired.</p>
</div>
<div class="content"><div class='highlight'><pre> on: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(name, callback, context)</span> {</span>
<span class="hljs-keyword">if</span> (!eventsApi(<span class="hljs-keyword">this</span>, <span class="hljs-string">'on'</span>, name, [callback, context]) || !callback) <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
<span class="hljs-keyword">this</span>._events || (<span class="hljs-keyword">this</span>._events = {});
<span class="hljs-keyword">var</span> events = <span class="hljs-keyword">this</span>._events[name] || (<span class="hljs-keyword">this</span>._events[name] = []);
events.push({callback: callback, context: context, ctx: context || <span class="hljs-keyword">this</span>});
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
},</pre></div></div>
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<p>Bind an event to only be triggered a single time. After the first time
the callback is invoked, it will be removed.</p>
</div>
<div class="content"><div class='highlight'><pre> once: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(name, callback, context)</span> {</span>
<span class="hljs-keyword">if</span> (!eventsApi(<span class="hljs-keyword">this</span>, <span class="hljs-string">'once'</span>, name, [callback, context]) || !callback) <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
<span class="hljs-keyword">var</span> self = <span class="hljs-keyword">this</span>;
<span class="hljs-keyword">var</span> once = _.once(<span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> {</span>
self.off(name, once);
callback.apply(<span class="hljs-keyword">this</span>, <span class="hljs-built_in">arguments</span>);
});
once._callback = callback;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.on(name, once, context);
},</pre></div></div>
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<p>Remove one or many callbacks. If <code>context</code> is null, removes all
callbacks with that function. If <code>callback</code> is null, removes all
callbacks for the event. If <code>name</code> is null, removes all bound
callbacks for all events.</p>
</div>
<div class="content"><div class='highlight'><pre> off: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(name, callback, context)</span> {</span>
<span class="hljs-keyword">var</span> retain, ev, events, names, i, l, j, k;
<span class="hljs-keyword">if</span> (!<span class="hljs-keyword">this</span>._events || !eventsApi(<span class="hljs-keyword">this</span>, <span class="hljs-string">'off'</span>, name, [callback, context])) <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
<span class="hljs-keyword">if</span> (!name && !callback && !context) {
<span class="hljs-keyword">this</span>._events = <span class="hljs-keyword">void</span> <span class="hljs-number">0</span>;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
}
names = name ? [name] : _.keys(<span class="hljs-keyword">this</span>._events);
<span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>, l = names.length; i < l; i++) {
name = names[i];
<span class="hljs-keyword">if</span> (events = <span class="hljs-keyword">this</span>._events[name]) {
<span class="hljs-keyword">this</span>._events[name] = retain = [];
<span class="hljs-keyword">if</span> (callback || context) {
<span class="hljs-keyword">for</span> (j = <span class="hljs-number">0</span>, k = events.length; j < k; j++) {
ev = events[j];
<span class="hljs-keyword">if</span> ((callback && callback !== ev.callback && callback !== ev.callback._callback) ||
(context && context !== ev.context)) {
retain.push(ev);
}
}
}
<span class="hljs-keyword">if</span> (!retain.length) <span class="hljs-keyword">delete</span> <span class="hljs-keyword">this</span>._events[name];
}
}
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
},</pre></div></div>
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<p>Trigger one or many events, firing all bound callbacks. Callbacks are
passed the same arguments as <code>trigger</code> is, apart from the event name
(unless you’re listening on <code>"all"</code>, which will cause your callback to
receive the true name of the event as the first argument).</p>
</div>
<div class="content"><div class='highlight'><pre> trigger: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(name)</span> {</span>
<span class="hljs-keyword">if</span> (!<span class="hljs-keyword">this</span>._events) <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
<span class="hljs-keyword">var</span> args = slice.call(<span class="hljs-built_in">arguments</span>, <span class="hljs-number">1</span>);
<span class="hljs-keyword">if</span> (!eventsApi(<span class="hljs-keyword">this</span>, <span class="hljs-string">'trigger'</span>, name, args)) <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
<span class="hljs-keyword">var</span> events = <span class="hljs-keyword">this</span>._events[name];
<span class="hljs-keyword">var</span> allEvents = <span class="hljs-keyword">this</span>._events.all;
<span class="hljs-keyword">if</span> (events) triggerEvents(events, args);
<span class="hljs-keyword">if</span> (allEvents) triggerEvents(allEvents, <span class="hljs-built_in">arguments</span>);
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
},</pre></div></div>
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<p>Tell this object to stop listening to either specific events … or
to every object it’s currently listening to.</p>
</div>
<div class="content"><div class='highlight'><pre> stopListening: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(obj, name, callback)</span> {</span>
<span class="hljs-keyword">var</span> listeningTo = <span class="hljs-keyword">this</span>._listeningTo;
<span class="hljs-keyword">if</span> (!listeningTo) <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
<span class="hljs-keyword">var</span> remove = !name && !callback;
<span class="hljs-keyword">if</span> (!callback && <span class="hljs-keyword">typeof</span> name === <span class="hljs-string">'object'</span>) callback = <span class="hljs-keyword">this</span>;
<span class="hljs-keyword">if</span> (obj) (listeningTo = {})[obj._listenId] = obj;
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> id <span class="hljs-keyword">in</span> listeningTo) {
obj = listeningTo[id];
obj.off(name, callback, <span class="hljs-keyword">this</span>);
<span class="hljs-keyword">if</span> (remove || _.isEmpty(obj._events)) <span class="hljs-keyword">delete</span> <span class="hljs-keyword">this</span>._listeningTo[id];
}
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
}
};</pre></div></div>
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<p>Regular expression used to split event strings.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> eventSplitter = <span class="hljs-regexp">/\s+/</span>;</pre></div></div>
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<p>Implement fancy features of the Events API such as multiple event
names <code>"change blur"</code> and jQuery-style event maps <code>{change: action}</code>
in terms of the existing API.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> eventsApi = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(obj, action, name, rest)</span> {</span>
<span class="hljs-keyword">if</span> (!name) <span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;</pre></div></div>
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<p>Handle event maps.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> name === <span class="hljs-string">'object'</span>) {
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> key <span class="hljs-keyword">in</span> name) {
obj[action].apply(obj, [key, name[key]].concat(rest));
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}</pre></div></div>
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<p>Handle space separated event names.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (eventSplitter.test(name)) {
<span class="hljs-keyword">var</span> names = name.split(eventSplitter);
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>, l = names.length; i < l; i++) {
obj[action].apply(obj, [names[i]].concat(rest));
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
};</pre></div></div>
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<p>A difficult-to-believe, but optimized internal dispatch function for
triggering events. Tries to keep the usual cases speedy (most internal
Backbone events have 3 arguments).</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> triggerEvents = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(events, args)</span> {</span>
<span class="hljs-keyword">var</span> ev, i = -<span class="hljs-number">1</span>, l = events.length, a1 = args[<span class="hljs-number">0</span>], a2 = args[<span class="hljs-number">1</span>], a3 = args[<span class="hljs-number">2</span>];
<span class="hljs-keyword">switch</span> (args.length) {
<span class="hljs-keyword">case</span> <span class="hljs-number">0</span>: <span class="hljs-keyword">while</span> (++i < l) (ev = events[i]).callback.call(ev.ctx); <span class="hljs-keyword">return</span>;
<span class="hljs-keyword">case</span> <span class="hljs-number">1</span>: <span class="hljs-keyword">while</span> (++i < l) (ev = events[i]).callback.call(ev.ctx, a1); <span class="hljs-keyword">return</span>;
<span class="hljs-keyword">case</span> <span class="hljs-number">2</span>: <span class="hljs-keyword">while</span> (++i < l) (ev = events[i]).callback.call(ev.ctx, a1, a2); <span class="hljs-keyword">return</span>;
<span class="hljs-keyword">case</span> <span class="hljs-number">3</span>: <span class="hljs-keyword">while</span> (++i < l) (ev = events[i]).callback.call(ev.ctx, a1, a2, a3); <span class="hljs-keyword">return</span>;
<span class="hljs-keyword">default</span>: <span class="hljs-keyword">while</span> (++i < l) (ev = events[i]).callback.apply(ev.ctx, args); <span class="hljs-keyword">return</span>;
}
};
<span class="hljs-keyword">var</span> listenMethods = {listenTo: <span class="hljs-string">'on'</span>, listenToOnce: <span class="hljs-string">'once'</span>};</pre></div></div>
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<p>Inversion-of-control versions of <code>on</code> and <code>once</code>. Tell <em>this</em> object to
listen to an event in another object … keeping track of what it’s
listening to.</p>
</div>
<div class="content"><div class='highlight'><pre> _.each(listenMethods, <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(implementation, method)</span> {</span>
Events[method] = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(obj, name, callback)</span> {</span>
<span class="hljs-keyword">var</span> listeningTo = <span class="hljs-keyword">this</span>._listeningTo || (<span class="hljs-keyword">this</span>._listeningTo = {});
<span class="hljs-keyword">var</span> id = obj._listenId || (obj._listenId = _.uniqueId(<span class="hljs-string">'l'</span>));
listeningTo[id] = obj;
<span class="hljs-keyword">if</span> (!callback && <span class="hljs-keyword">typeof</span> name === <span class="hljs-string">'object'</span>) callback = <span class="hljs-keyword">this</span>;
obj[implementation](name, callback, <span class="hljs-keyword">this</span>);
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
};
});</pre></div></div>
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<p>Aliases for backwards compatibility.</p>
</div>
<div class="content"><div class='highlight'><pre> Events.bind = Events.on;
Events.unbind = Events.off;</pre></div></div>
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<p>Allow the <code>Backbone</code> object to serve as a global event bus, for folks who
want global “pubsub” in a convenient place.</p>
</div>
<div class="content"><div class='highlight'><pre> _.extend(Backbone, Events);</pre></div></div>
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<h2 id="backbone-model">Backbone.Model</h2>
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<p>Backbone <strong>Models</strong> are the basic data object in the framework —
frequently representing a row in a table in a database on your server.
A discrete chunk of data and a bunch of useful, related methods for
performing computations and transformations on that data.</p>
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<p>Create a new model with the specified attributes. A client id (<code>cid</code>)
is automatically generated and assigned for you.</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> Model = Backbone.Model = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(attributes, options)</span> {</span>
<span class="hljs-keyword">var</span> attrs = attributes || {};
options || (options = {});
<span class="hljs-keyword">this</span>.cid = _.uniqueId(<span class="hljs-string">'c'</span>);
<span class="hljs-keyword">this</span>.attributes = {};
<span class="hljs-keyword">if</span> (options.collection) <span class="hljs-keyword">this</span>.collection = options.collection;
<span class="hljs-keyword">if</span> (options.parse) attrs = <span class="hljs-keyword">this</span>.parse(attrs, options) || {};
attrs = _.defaults({}, attrs, _.result(<span class="hljs-keyword">this</span>, <span class="hljs-string">'defaults'</span>));
<span class="hljs-keyword">this</span>.set(attrs, options);
<span class="hljs-keyword">this</span>.changed = {};
<span class="hljs-keyword">this</span>.initialize.apply(<span class="hljs-keyword">this</span>, <span class="hljs-built_in">arguments</span>);
};</pre></div></div>
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<p>Attach all inheritable methods to the Model prototype.</p>
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<div class="content"><div class='highlight'><pre> _.extend(Model.prototype, Events, {</pre></div></div>
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<p>A hash of attributes whose current and previous value differ.</p>
</div>
<div class="content"><div class='highlight'><pre> changed: <span class="hljs-literal">null</span>,</pre></div></div>
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<p>The value returned during the last failed validation.</p>
</div>
<div class="content"><div class='highlight'><pre> validationError: <span class="hljs-literal">null</span>,</pre></div></div>
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<p>The default name for the JSON <code>id</code> attribute is <code>"id"</code>. MongoDB and
CouchDB users may want to set this to <code>"_id"</code>.</p>
</div>
<div class="content"><div class='highlight'><pre> idAttribute: <span class="hljs-string">'id'</span>,</pre></div></div>
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<p>Initialize is an empty function by default. Override it with your own
initialization logic.</p>
</div>
<div class="content"><div class='highlight'><pre> initialize: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span>{</span>},</pre></div></div>
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<p>Return a copy of the model’s <code>attributes</code> object.</p>
</div>
<div class="content"><div class='highlight'><pre> toJSON: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(options)</span> {</span>
<span class="hljs-keyword">return</span> _.clone(<span class="hljs-keyword">this</span>.attributes);
},</pre></div></div>
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<p>Proxy <code>Backbone.sync</code> by default — but override this if you need
custom syncing semantics for <em>this</em> particular model.</p>
</div>
<div class="content"><div class='highlight'><pre> sync: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> {</span>
<span class="hljs-keyword">return</span> Backbone.sync.apply(<span class="hljs-keyword">this</span>, <span class="hljs-built_in">arguments</span>);
},</pre></div></div>
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<p>Get the value of an attribute.</p>
</div>
<div class="content"><div class='highlight'><pre> get: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(attr)</span> {</span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.attributes[attr];
},</pre></div></div>
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<p>Get the HTML-escaped value of an attribute.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-built_in">escape</span>: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(attr)</span> {</span>
<span class="hljs-keyword">return</span> _.escape(<span class="hljs-keyword">this</span>.get(attr));
},</pre></div></div>
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<p>Returns <code>true</code> if the attribute contains a value that is not null
or undefined.</p>
</div>
<div class="content"><div class='highlight'><pre> has: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(attr)</span> {</span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.get(attr) != <span class="hljs-literal">null</span>;
},</pre></div></div>
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<p>Set a hash of model attributes on the object, firing <code>"change"</code>. This is
the core primitive operation of a model, updating the data and notifying
anyone who needs to know about the change in state. The heart of the beast.</p>
</div>
<div class="content"><div class='highlight'><pre> set: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(key, val, options)</span> {</span>
<span class="hljs-keyword">var</span> attr, attrs, unset, changes, silent, changing, prev, current;
<span class="hljs-keyword">if</span> (key == <span class="hljs-literal">null</span>) <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;</pre></div></div>
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<p>Handle both <code>"key", value</code> and <code>{key: value}</code> -style arguments.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> key === <span class="hljs-string">'object'</span>) {
attrs = key;
options = val;
} <span class="hljs-keyword">else</span> {
(attrs = {})[key] = val;
}
options || (options = {});</pre></div></div>
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<p>Run validation.</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (!<span class="hljs-keyword">this</span>._validate(attrs, options)) <span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;</pre></div></div>
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<p>Extract attributes and options.</p>
</div>
<div class="content"><div class='highlight'><pre> unset = options.unset;
silent = options.silent;
changes = [];
changing = <span class="hljs-keyword">this</span>._changing;
<span class="hljs-keyword">this</span>._changing = <span class="hljs-literal">true</span>;
<span class="hljs-keyword">if</span> (!changing) {
<span class="hljs-keyword">this</span>._previousAttributes = _.clone(<span class="hljs-keyword">this</span>.attributes);
<span class="hljs-keyword">this</span>.changed = {};
}
current = <span class="hljs-keyword">this</span>.attributes, prev = <span class="hljs-keyword">this</span>._previousAttributes;</pre></div></div>
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<p>Check for changes of <code>id</code>.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (<span class="hljs-keyword">this</span>.idAttribute <span class="hljs-keyword">in</span> attrs) <span class="hljs-keyword">this</span>.id = attrs[<span class="hljs-keyword">this</span>.idAttribute];</pre></div></div>
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<p>For each <code>set</code> attribute, update or delete the current value.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">for</span> (attr <span class="hljs-keyword">in</span> attrs) {
val = attrs[attr];
<span class="hljs-keyword">if</span> (!_.isEqual(current[attr], val)) changes.push(attr);
<span class="hljs-keyword">if</span> (!_.isEqual(prev[attr], val)) {
<span class="hljs-keyword">this</span>.changed[attr] = val;
} <span class="hljs-keyword">else</span> {
<span class="hljs-keyword">delete</span> <span class="hljs-keyword">this</span>.changed[attr];
}
unset ? <span class="hljs-keyword">delete</span> current[attr] : current[attr] = val;
}</pre></div></div>
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<p>Trigger all relevant attribute changes.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (!silent) {
<span class="hljs-keyword">if</span> (changes.length) <span class="hljs-keyword">this</span>._pending = options;
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>, l = changes.length; i < l; i++) {
<span class="hljs-keyword">this</span>.trigger(<span class="hljs-string">'change:'</span> + changes[i], <span class="hljs-keyword">this</span>, current[changes[i]], options);
}
}</pre></div></div>
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