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<!DOCTYPE html>
<html>
<head>
<title>view.coffee</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 id="jump_to">
<li>
<a class="large" href="javascript:void(0);">Jump To …</a>
<a class="small" href="javascript:void(0);">+</a>
<div id="jump_wrapper">
<div id="jump_page">
<a class="source" href="chaplin.html">
chaplin.coffee
</a>
<a class="source" href="application.html">
application.coffee
</a>
<a class="source" href="composer.html">
composer.coffee
</a>
<a class="source" href="controller.html">
controller.coffee
</a>
<a class="source" href="dispatcher.html">
dispatcher.coffee
</a>
<a class="source" href="composition.html">
composition.coffee
</a>
<a class="source" href="event_broker.html">
event_broker.coffee
</a>
<a class="source" href="history.html">
history.coffee
</a>
<a class="source" href="route.html">
route.coffee
</a>
<a class="source" href="router.html">
router.coffee
</a>
<a class="source" href="support.html">
support.coffee
</a>
<a class="source" href="sync_machine.html">
sync_machine.coffee
</a>
<a class="source" href="utils.html">
utils.coffee
</a>
<a class="source" href="mediator.html">
mediator.coffee
</a>
<a class="source" href="collection.html">
collection.coffee
</a>
<a class="source" href="model.html">
model.coffee
</a>
<a class="source" href="collection_view.html">
collection_view.coffee
</a>
<a class="source" href="layout.html">
layout.coffee
</a>
<a class="source" href="view.html">
view.coffee
</a>
</div>
</li>
</ul>
<ul class="sections">
<li id="title">
<div class="annotation">
<h1>view.coffee</h1>
</div>
</li>
<li id="section-1">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-1">¶</a>
</div>
</div>
<div class="content"><div class='highlight'><pre><span class="string">'use strict'</span>
_ = <span class="built_in">require</span> <span class="string">'underscore'</span>
Backbone = <span class="built_in">require</span> <span class="string">'backbone'</span>
mediator = <span class="built_in">require</span> <span class="string">'chaplin/mediator'</span>
EventBroker = <span class="built_in">require</span> <span class="string">'chaplin/lib/event_broker'</span>
utils = <span class="built_in">require</span> <span class="string">'chaplin/lib/utils'</span></pre></div></div>
</li>
<li id="section-2">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-2">¶</a>
</div>
<p>Shortcut to access the DOM manipulation library.</p>
</div>
<div class="content"><div class='highlight'><pre>$ = Backbone.$</pre></div></div>
</li>
<li id="section-3">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-3">¶</a>
</div>
<p>Function bind shortcut.</p>
</div>
<div class="content"><div class='highlight'><pre>bind = <span class="keyword">do</span><span class="function"> -></span>
<span class="keyword">if</span> <span class="attribute">Function</span>::bind
<span class="function"><span class="params">(item, ctx)</span> -></span> item.bind ctx
<span class="keyword">else</span> <span class="keyword">if</span> _.bind
_.bind
setHTML = <span class="keyword">do</span><span class="function"> -></span>
<span class="keyword">if</span> $
<span class="function"><span class="params">(elem, html)</span> -></span> elem.html html
<span class="keyword">else</span>
<span class="function"><span class="params">(elem, html)</span> -></span> elem.innerHTML = html
attach = <span class="keyword">do</span><span class="function"> -></span>
<span class="keyword">if</span> $
<span class="function"><span class="params">(view)</span> -></span>
actual = $(view.container)
<span class="keyword">if</span> <span class="keyword">typeof</span> view.containerMethod <span class="keyword">is</span> <span class="string">'function'</span>
view.containerMethod actual, view.el
<span class="keyword">else</span>
actual[view.containerMethod] view.el
<span class="keyword">else</span>
<span class="function"><span class="params">(view)</span> -></span>
actual = <span class="keyword">if</span> <span class="keyword">typeof</span> view.container <span class="keyword">is</span> <span class="string">'string'</span>
document.querySelector view.container
<span class="keyword">else</span>
view.container
<span class="keyword">if</span> <span class="keyword">typeof</span> view.containerMethod <span class="keyword">is</span> <span class="string">'function'</span>
view.containerMethod actual, view.el
<span class="keyword">else</span>
actual[view.containerMethod] view.el
module.<span class="built_in">exports</span> = <span class="class"><span class="keyword">class</span> <span class="title">View</span> <span class="keyword">extends</span> <span class="title">Backbone</span>.<span class="title">View</span></span></pre></div></div>
</li>
<li id="section-4">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-4">¶</a>
</div>
<p>Mixin an EventBroker.</p>
</div>
<div class="content"><div class='highlight'><pre> _.extend <span class="property">@prototype</span>, EventBroker</pre></div></div>
</li>
<li id="section-5">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-5">¶</a>
</div>
<h2 id="automatic-rendering">Automatic rendering</h2>
</div>
</li>
<li id="section-6">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-6">¶</a>
</div>
<p>Flag whether to render the view automatically on initialization.
As an alternative you might pass a <code>render</code> option to the constructor.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">autoRender</span>: <span class="literal">false</span></pre></div></div>
</li>
<li id="section-7">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-7">¶</a>
</div>
<p>Flag whether to attach the view automatically on render.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">autoAttach</span>: <span class="literal">true</span></pre></div></div>
</li>
<li id="section-8">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-8">¶</a>
</div>
<h2 id="automatic-inserting-into-dom">Automatic inserting into DOM</h2>
</div>
</li>
<li id="section-9">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-9">¶</a>
</div>
<p>View container element.
Set this property in a derived class to specify the container element.
Normally this is a selector string but it might also be an element or
jQuery object.
The view is automatically inserted into the container when it’s rendered.
As an alternative you might pass a <code>container</code> option to the constructor.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">container</span>: <span class="literal">null</span></pre></div></div>
</li>
<li id="section-10">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-10">¶</a>
</div>
<p>Method which is used for adding the view to the DOM
Like jQuery’s <code>html</code>, <code>prepend</code>, <code>append</code>, <code>after</code>, <code>before</code> etc.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">containerMethod</span>: <span class="keyword">if</span> $ <span class="keyword">then</span> <span class="string">'append'</span> <span class="keyword">else</span> <span class="string">'appendChild'</span></pre></div></div>
</li>
<li id="section-11">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-11">¶</a>
</div>
<h2 id="regions">Regions</h2>
</div>
</li>
<li id="section-12">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-12">¶</a>
</div>
<p>Region registration; regions are in essence named selectors that aim
to decouple the view from its parent.</p>
<p>This functions close to the declarative events hash; use as follows:
regions:
'region1': '.class'
'region2': '#id'</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">regions</span>: <span class="literal">null</span></pre></div></div>
</li>
<li id="section-13">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-13">¶</a>
</div>
<p>Region application is the reverse; you're specifying that this view
will be inserted into the DOM at the named region. Error thrown if
the region is unregistered at the time of initialization.
Set the region name on your derived class or pass it into the
constructor in controller action.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">region</span>: <span class="literal">null</span></pre></div></div>
</li>
<li id="section-14">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-14">¶</a>
</div>
<p>A view is <code>stale</code> when it has been previously composed by the last
route but has not yet been composed by the current route.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">stale</span>: <span class="literal">false</span></pre></div></div>
</li>
<li id="section-15">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-15">¶</a>
</div>
<p>Flag whether to wrap a view with the <code>tagName</code> element when
rendering into a region.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">noWrap</span>: <span class="literal">false</span></pre></div></div>
</li>
<li id="section-16">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-16">¶</a>
</div>
<p>Specifies if current element should be kept in DOM after disposal.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">keepElement</span>: <span class="literal">false</span></pre></div></div>
</li>
<li id="section-17">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-17">¶</a>
</div>
<h2 id="subviews">Subviews</h2>
</div>
</li>
<li id="section-18">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-18">¶</a>
</div>
<p>List of subviews.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">subviews</span>: <span class="literal">null</span>
<span class="attribute">subviewsByName</span>: <span class="literal">null</span></pre></div></div>
</li>
<li id="section-19">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-19">¶</a>
</div>
<h2 id="initialization">Initialization</h2>
</div>
</li>
<li id="section-20">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-20">¶</a>
</div>
<p>List of options that will be picked from constructor.
Easy to extend: <code>optionNames: View::optionNames.concat ['template']</code></p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">optionNames</span>: [
<span class="string">'autoAttach'</span>, <span class="string">'autoRender'</span>,
<span class="string">'container'</span>, <span class="string">'containerMethod'</span>,
<span class="string">'region'</span>, <span class="string">'regions'</span>
<span class="string">'noWrap'</span>
]
<span class="attribute">constructor</span>: <span class="function"><span class="params">(options)</span> -></span></pre></div></div>
</li>
<li id="section-21">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-21">¶</a>
</div>
<p>Copy some options to instance properties.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> options
<span class="keyword">for</span> optName, optValue <span class="keyword">of</span> options <span class="keyword">when</span> optName <span class="keyword">in</span> <span class="property">@optionNames</span>
<span class="keyword">this</span>[optName] = optValue</pre></div></div>
</li>
<li id="section-22">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-22">¶</a>
</div>
<p>Wrap <code>render</code> so <code>attach</code> is called afterwards.
Enclose the original function.</p>
</div>
<div class="content"><div class='highlight'><pre> render = <span class="property">@render</span></pre></div></div>
</li>
<li id="section-23">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-23">¶</a>
</div>
<p>Create the wrapper method.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@render</span> =<span class="function"> =></span></pre></div></div>
</li>
<li id="section-24">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-24">¶</a>
</div>
<p>Stop if the instance was already disposed.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">return</span> <span class="literal">false</span> <span class="keyword">if</span> <span class="property">@disposed</span></pre></div></div>
</li>
<li id="section-25">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-25">¶</a>
</div>
<p>Call the original method.</p>
</div>
<div class="content"><div class='highlight'><pre> render.apply <span class="keyword">this</span>, arguments</pre></div></div>
</li>
<li id="section-26">
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<p>Attach to DOM.</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@attach</span> arguments... <span class="keyword">if</span> <span class="property">@autoAttach</span></pre></div></div>
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<p>Return the view.</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">this</span></pre></div></div>
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<p>Initialize subviews collections.</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@subviews</span> = []
<span class="property">@subviewsByName</span> = {}
<span class="keyword">if</span> <span class="property">@noWrap</span>
<span class="keyword">if</span> <span class="property">@region</span>
region = mediator.execute <span class="string">'region:find'</span>, <span class="property">@region</span></pre></div></div>
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<p>Set the <code>this.el</code> to be the closest relevant container.</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> region?
<span class="property">@el</span> =
<span class="keyword">if</span> region.instance.container?
<span class="keyword">if</span> region.instance.region?
$(region.instance.container).find region.selector
<span class="keyword">else</span>
region.instance.container
<span class="keyword">else</span>
region.instance.$ region.selector
<span class="property">@el</span> = <span class="property">@container</span> <span class="keyword">if</span> <span class="property">@container</span></pre></div></div>
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<p>Call Backbone’s constructor.</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">super</span></pre></div></div>
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<p>Set up declarative bindings after <code>initialize</code> has been called
so initialize may set model/collection and create or bind methods.</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@delegateListeners</span>()</pre></div></div>
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<p>Listen for disposal of the model or collection.
If the model is disposed, automatically dispose the associated view.</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@listenTo</span> <span class="property">@model</span>, <span class="string">'dispose'</span>, <span class="property">@dispose</span> <span class="keyword">if</span> <span class="property">@model</span>
<span class="keyword">if</span> <span class="property">@collection</span>
<span class="property">@listenTo</span> <span class="property">@collection</span>, <span class="string">'dispose'</span>, <span class="function"><span class="params">(subject)</span> =></span>
<span class="property">@dispose</span>() <span class="keyword">if</span> <span class="keyword">not</span> subject <span class="keyword">or</span> subject <span class="keyword">is</span> <span class="property">@collection</span></pre></div></div>
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<p>Register all exposed regions.</p>
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<div class="content"><div class='highlight'><pre> mediator.execute <span class="string">'region:register'</span>, <span class="keyword">this</span> <span class="keyword">if</span> <span class="property">@regions</span>?</pre></div></div>
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<p>Render automatically if set by options or instance property.</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@render</span>() <span class="keyword">if</span> <span class="property">@autoRender</span></pre></div></div>
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<h2 id="user-input-event-handling">User input event handling</h2>
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<p>Event handling using event delegation
Register a handler for a specific event type
For the whole view:
delegate(eventName, handler)
e.g.
@delegate('click', @clicked)
For an element in the passing a selector:
delegate(eventName, selector, handler)
e.g.
@delegate('click', 'button.confirm', @confirm)</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">delegate</span>: <span class="function"><span class="params">(eventName, second, third)</span> -></span>
<span class="keyword">if</span> Backbone.utils
<span class="keyword">return</span> Backbone.utils.delegate(<span class="keyword">this</span>, eventName, second, third)
<span class="keyword">if</span> <span class="keyword">typeof</span> eventName <span class="keyword">isnt</span> <span class="string">'string'</span>
<span class="keyword">throw</span> <span class="keyword">new</span> TypeError <span class="string">'View#delegate: first argument must be a string'</span>
<span class="keyword">if</span> arguments.length <span class="keyword">is</span> <span class="number">2</span>
handler = second
<span class="keyword">else</span> <span class="keyword">if</span> arguments.length <span class="keyword">is</span> <span class="number">3</span>
selector = second
<span class="keyword">if</span> <span class="keyword">typeof</span> selector <span class="keyword">isnt</span> <span class="string">'string'</span>
<span class="keyword">throw</span> <span class="keyword">new</span> TypeError <span class="string">'View#delegate: '</span> +
<span class="string">'second argument must be a string'</span>
handler = third
<span class="keyword">else</span>
<span class="keyword">throw</span> <span class="keyword">new</span> TypeError <span class="string">'View#delegate: '</span> +
<span class="string">'only two or three arguments are allowed'</span>
<span class="keyword">if</span> <span class="keyword">typeof</span> handler <span class="keyword">isnt</span> <span class="string">'function'</span>
<span class="keyword">throw</span> <span class="keyword">new</span> TypeError <span class="string">'View#delegate: '</span> +
<span class="string">'handler argument must be function'</span></pre></div></div>
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<p>Add an event namespace, bind handler it to view.</p>
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<div class="content"><div class='highlight'><pre> list = (<span class="string">"<span class="subst">#{event}</span>.delegate<span class="subst">#{<span class="property">@cid</span>}</span>"</span> <span class="keyword">for</span> event <span class="keyword">in</span> eventName.split <span class="string">' '</span>)
events = list.join(<span class="string">' '</span>)
bound = bind handler, <span class="keyword">this</span>
<span class="property">@$el</span>.<span class="literal">on</span> events, (selector <span class="keyword">or</span> <span class="literal">null</span>), bound</pre></div></div>
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<p>Return the bound handler.</p>
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<div class="content"><div class='highlight'><pre> bound</pre></div></div>
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<p>Copy of original Backbone method without <code>undelegateEvents</code> call.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">_delegateEvents</span>: <span class="function"><span class="params">(events)</span> -></span>
<span class="keyword">if</span> Backbone.<span class="attribute">View</span>::delegateEvents.length <span class="keyword">is</span> <span class="number">2</span>
<span class="keyword">return</span> Backbone.<span class="attribute">View</span>::delegateEvents.call <span class="keyword">this</span>, events, <span class="literal">true</span>
<span class="keyword">for</span> key, value <span class="keyword">of</span> events
handler = <span class="keyword">if</span> <span class="keyword">typeof</span> value <span class="keyword">is</span> <span class="string">'function'</span> <span class="keyword">then</span> value <span class="keyword">else</span> <span class="keyword">this</span>[value]
<span class="keyword">throw</span> <span class="keyword">new</span> Error <span class="string">"Method '<span class="subst">#{value}</span>' does not exist"</span> <span class="keyword">unless</span> handler
match = key.match <span class="regexp">/^(\S+)\s*(.*)$/</span>
eventName = <span class="string">"<span class="subst">#{match[<span class="number">1</span>]}</span>.delegateEvents<span class="subst">#{<span class="property">@cid</span>}</span>"</span>
selector = match[<span class="number">2</span>]
bound = bind handler, <span class="keyword">this</span>
<span class="property">@$el</span>.<span class="literal">on</span> eventName, (selector <span class="keyword">or</span> <span class="literal">null</span>), bound
<span class="keyword">return</span></pre></div></div>
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<p>Override Backbones method to combine the events
of the parent view if it exists.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">delegateEvents</span>: <span class="function"><span class="params">(events, keepOld)</span> -></span>
<span class="property">@undelegateEvents</span>() <span class="keyword">unless</span> keepOld
<span class="keyword">return</span> <span class="property">@_delegateEvents</span> events <span class="keyword">if</span> events</pre></div></div>
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<p>Call _delegateEvents for all superclasses’ <code>events</code>.</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">for</span> classEvents <span class="keyword">in</span> utils.getAllPropertyVersions <span class="keyword">this</span>, <span class="string">'events'</span>
<span class="keyword">if</span> <span class="keyword">typeof</span> classEvents <span class="keyword">is</span> <span class="string">'function'</span>
<span class="keyword">throw</span> <span class="keyword">new</span> TypeError <span class="string">'View#delegateEvents: functions are not supported'</span>
<span class="property">@_delegateEvents</span> classEvents
<span class="keyword">return</span></pre></div></div>
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<p>Remove all handlers registered with @delegate.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">undelegate</span>: <span class="function"><span class="params">(eventName, second, third)</span> -></span>
<span class="keyword">if</span> Backbone.utils
<span class="keyword">return</span> Backbone.utils.undelegate(<span class="keyword">this</span>, eventName, second, third)
<span class="keyword">if</span> eventName
<span class="keyword">if</span> <span class="keyword">typeof</span> eventName <span class="keyword">isnt</span> <span class="string">'string'</span>
<span class="keyword">throw</span> <span class="keyword">new</span> TypeError <span class="string">'View#undelegate: first argument must be a string'</span>
<span class="keyword">if</span> arguments.length <span class="keyword">is</span> <span class="number">2</span>
<span class="keyword">if</span> <span class="keyword">typeof</span> second <span class="keyword">is</span> <span class="string">'string'</span>
selector = second
<span class="keyword">else</span>
handler = second
<span class="keyword">else</span> <span class="keyword">if</span> arguments.length <span class="keyword">is</span> <span class="number">3</span>
selector = second
<span class="keyword">if</span> <span class="keyword">typeof</span> selector <span class="keyword">isnt</span> <span class="string">'string'</span>
<span class="keyword">throw</span> <span class="keyword">new</span> TypeError <span class="string">'View#undelegate: '</span> +
<span class="string">'second argument must be a string'</span>
handler = third
list = (<span class="string">"<span class="subst">#{event}</span>.delegate<span class="subst">#{<span class="property">@cid</span>}</span>"</span> <span class="keyword">for</span> event <span class="keyword">in</span> eventName.split <span class="string">' '</span>)
events = list.join(<span class="string">' '</span>)
<span class="property">@$el</span>.<span class="literal">off</span> events, (selector <span class="keyword">or</span> <span class="literal">null</span>)
<span class="keyword">else</span>
<span class="property">@$el</span>.<span class="literal">off</span> <span class="string">".delegate<span class="subst">#{<span class="property">@cid</span>}</span>"</span></pre></div></div>
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<p>Handle declarative event bindings from <code>listen</code></p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">delegateListeners</span>:<span class="function"> -></span>
<span class="keyword">return</span> <span class="keyword">unless</span> <span class="property">@listen</span></pre></div></div>
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<p>Walk all <code>listen</code> hashes in the prototype chain.</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">for</span> version <span class="keyword">in</span> utils.getAllPropertyVersions <span class="keyword">this</span>, <span class="string">'listen'</span>
<span class="keyword">for</span> key, method <span class="keyword">of</span> version</pre></div></div>
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<p>Get the method, ensure it is a function.</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> <span class="keyword">typeof</span> method <span class="keyword">isnt</span> <span class="string">'function'</span>
method = <span class="keyword">this</span>[method]
<span class="keyword">if</span> <span class="keyword">typeof</span> method <span class="keyword">isnt</span> <span class="string">'function'</span>
<span class="keyword">throw</span> <span class="keyword">new</span> Error <span class="string">'View#delegateListeners: '</span> +
<span class="string">"<span class="subst">#{method}</span> must be function"</span></pre></div></div>
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<p>Split event name and target.</p>
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<div class="content"><div class='highlight'><pre> [eventName, target] = key.split <span class="string">' '</span>
<span class="property">@delegateListener</span> eventName, target, method
<span class="keyword">return</span>
<span class="attribute">delegateListener</span>: <span class="function"><span class="params">(eventName, target, callback)</span> -></span>
<span class="keyword">if</span> target <span class="keyword">in</span> [<span class="string">'model'</span>, <span class="string">'collection'</span>]
prop = <span class="keyword">this</span>[target]
<span class="property">@listenTo</span> prop, eventName, callback <span class="keyword">if</span> prop
<span class="keyword">else</span> <span class="keyword">if</span> target <span class="keyword">is</span> <span class="string">'mediator'</span>
<span class="property">@subscribeEvent</span> eventName, callback
<span class="keyword">else</span> <span class="keyword">if</span> <span class="keyword">not</span> target
<span class="property">@on</span> eventName, callback, <span class="keyword">this</span>
<span class="keyword">return</span></pre></div></div>
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<h2 id="region-management">Region management</h2>
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