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<!DOCTYPE html>
<html>
<head>
<title>collection_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">
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<ul class="sections">
<li id="title">
<div class="annotation">
<h1>collection_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>
View = <span class="built_in">require</span> <span class="string">'chaplin/views/view'</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.$
<span class="function"><span class="title">filterChildren</span> = <span class="params">(nodeList, selector)</span> -></span>
<span class="keyword">return</span> nodeList <span class="keyword">unless</span> selector
<span class="keyword">for</span> node <span class="keyword">in</span> nodeList <span class="keyword">when</span> Backbone.utils.matchesSelector node, selector
node
toggleElement = <span class="keyword">do</span><span class="function"> -></span>
<span class="keyword">if</span> $
<span class="function"><span class="params">(elem, visible)</span> -></span> elem.toggle visible
<span class="keyword">else</span>
<span class="function"><span class="params">(elem, visible)</span> -></span>
elem.style.display = (<span class="keyword">if</span> visible <span class="keyword">then</span> <span class="string">''</span> <span class="keyword">else</span> <span class="string">'none'</span>)
addClass = <span class="keyword">do</span><span class="function"> -></span>
<span class="keyword">if</span> $
<span class="function"><span class="params">(elem, cls)</span> -></span> elem.addClass cls
<span class="keyword">else</span>
<span class="function"><span class="params">(elem, cls)</span> -></span> elem.classList.add cls
startAnimation = <span class="keyword">do</span><span class="function"> -></span>
<span class="keyword">if</span> $
<span class="function"><span class="params">(elem, useCssAnimation, cls)</span> -></span>
<span class="keyword">if</span> useCssAnimation
addClass elem, cls
<span class="keyword">else</span>
elem.css <span class="string">'opacity'</span>, <span class="number">0</span>
<span class="keyword">else</span>
<span class="function"><span class="params">(elem, useCssAnimation, cls)</span> -></span>
<span class="keyword">if</span> useCssAnimation
addClass elem, cls
<span class="keyword">else</span>
elem.style.opacity = <span class="number">0</span>
endAnimation = <span class="keyword">do</span><span class="function"> -></span>
<span class="keyword">if</span> $
<span class="function"><span class="params">(elem, duration)</span> -></span> elem.animate {<span class="attribute">opacity</span>: <span class="number">1</span>}, duration
<span class="keyword">else</span>
<span class="function"><span class="params">(elem, duration)</span> -></span>
elem.style.transition = <span class="string">"opacity <span class="subst">#{(duration / <span class="number">1000</span>)}</span>s"</span>
elem.opacity = <span class="number">1</span>
insertView = <span class="keyword">do</span><span class="function"> -></span>
<span class="keyword">if</span> $
<span class="function"><span class="params">(list, viewEl, position, length, itemSelector)</span> -></span>
insertInMiddle = (<span class="number">0</span> < position < length)
<span class="function"><span class="title">isEnd</span> = <span class="params">(length)</span> -></span> length <span class="keyword">is</span> <span class="number">0</span> <span class="keyword">or</span> position <span class="keyword">is</span> length
<span class="keyword">if</span> insertInMiddle <span class="keyword">or</span> itemSelector</pre></div></div>
</li>
<li id="section-3">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-3">¶</a>
</div>
<p>Get the children which originate from item views.</p>
</div>
<div class="content"><div class='highlight'><pre> children = list.children itemSelector
childrenLength = children.length</pre></div></div>
</li>
<li id="section-4">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-4">¶</a>
</div>
<p>Check if it needs to be inserted.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">unless</span> children[position] <span class="keyword">is</span> viewEl
<span class="keyword">if</span> isEnd childrenLength</pre></div></div>
</li>
<li id="section-5">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-5">¶</a>
</div>
<p>Insert at the end.</p>
</div>
<div class="content"><div class='highlight'><pre> list.append viewEl
<span class="keyword">else</span></pre></div></div>
</li>
<li id="section-6">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-6">¶</a>
</div>
<p>Insert at the right position.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> position <span class="keyword">is</span> <span class="number">0</span>
children.eq(position).before viewEl
<span class="keyword">else</span>
children.eq(position - <span class="number">1</span>).after viewEl
<span class="keyword">else</span>
method = <span class="keyword">if</span> isEnd length <span class="keyword">then</span> <span class="string">'append'</span> <span class="keyword">else</span> <span class="string">'prepend'</span>
list[method] viewEl
<span class="keyword">else</span>
<span class="function"><span class="params">(list, viewEl, position, length, itemSelector)</span> -></span>
insertInMiddle = (<span class="number">0</span> < position < length)
<span class="function"><span class="title">isEnd</span> = <span class="params">(length)</span> -></span> length <span class="keyword">is</span> <span class="number">0</span> <span class="keyword">or</span> position <span class="keyword">is</span> length
<span class="keyword">if</span> insertInMiddle <span class="keyword">or</span> itemSelector</pre></div></div>
</li>
<li id="section-7">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-7">¶</a>
</div>
<p>Get the children which originate from item views.</p>
</div>
<div class="content"><div class='highlight'><pre> children = filterChildren list.children, itemSelector
childrenLength = children.length</pre></div></div>
</li>
<li id="section-8">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-8">¶</a>
</div>
<p>Check if it needs to be inserted.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">unless</span> children[position] <span class="keyword">is</span> viewEl
<span class="keyword">if</span> isEnd childrenLength</pre></div></div>
</li>
<li id="section-9">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-9">¶</a>
</div>
<p>Insert at the end.</p>
</div>
<div class="content"><div class='highlight'><pre> list.appendChild viewEl
<span class="keyword">else</span> <span class="keyword">if</span> position <span class="keyword">is</span> <span class="number">0</span></pre></div></div>
</li>
<li id="section-10">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-10">¶</a>
</div>
<p>Insert at the right position.</p>
</div>
<div class="content"><div class='highlight'><pre> list.insertBefore viewEl, children[position]
<span class="keyword">else</span>
last = children[position - <span class="number">1</span>]
<span class="keyword">if</span> list.lastChild <span class="keyword">is</span> last
list.appendChild viewEl
<span class="keyword">else</span>
list.insertBefore viewEl, last.nextElementSibling
<span class="keyword">else</span> <span class="keyword">if</span> isEnd length
list.appendChild viewEl
<span class="keyword">else</span>
list.insertBefore viewEl, list.firstChild</pre></div></div>
</li>
<li id="section-11">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-11">¶</a>
</div>
<p>General class for rendering Collections.
Derive this class and declare at least <code>itemView</code> or override
<code>initItemView</code>. <code>initItemView</code> gets an item model and should instantiate
and return a corresponding item view.</p>
</div>
<div class="content"><div class='highlight'><pre>module.<span class="built_in">exports</span> = <span class="class"><span class="keyword">class</span> <span class="title">CollectionView</span> <span class="keyword">extends</span> <span class="title">View</span></span></pre></div></div>
</li>
<li id="section-12">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-12">¶</a>
</div>
<h1 id="configuration-options">Configuration options</h1>
</div>
</li>
<li id="section-13">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-13">¶</a>
</div>
<p>These options may be overwritten in derived classes.</p>
<p>A class of item in collection.
This property has to be overridden by a derived class.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">itemView</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>
<h2 id="automatic-rendering">Automatic rendering</h2>
</div>
</li>
<li id="section-15">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-15">¶</a>
</div>
<p>Per default, render the view itself and all items on creation.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">autoRender</span>: <span class="literal">true</span>
<span class="attribute">renderItems</span>: <span class="literal">true</span></pre></div></div>
</li>
<li id="section-16">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-16">¶</a>
</div>
<h2 id="animation">Animation</h2>
</div>
</li>
<li id="section-17">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-17">¶</a>
</div>
<p>When new items are added, their views are faded in.
Animation duration in milliseconds (set to 0 to disable fade in)</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">animationDuration</span>: <span class="number">500</span></pre></div></div>
</li>
<li id="section-18">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-18">¶</a>
</div>
<p>By default, fading in is done by javascript function which can be
slow on mobile devices. CSS animations are faster,
but require user’s manual definitions.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">useCssAnimation</span>: <span class="literal">false</span></pre></div></div>
</li>
<li id="section-19">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-19">¶</a>
</div>
<p>CSS classes that will be used when hiding / showing child views.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">animationStartClass</span>: <span class="string">'animated-item-view'</span>
<span class="attribute">animationEndClass</span>: <span class="string">'animated-item-view-end'</span></pre></div></div>
</li>
<li id="section-20">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-20">¶</a>
</div>
<h2 id="selectors-and-elements">Selectors and elements</h2>
</div>
</li>
<li id="section-21">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-21">¶</a>
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<p>A collection view may have a template and use one of its child elements
as the container of the item views. If you specify <code>listSelector</code>, the
item views will be appended to this element. If empty, $el is used.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">listSelector</span>: <span class="literal">null</span></pre></div></div>
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<p>The actual element which is fetched using <code>listSelector</code></p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">$list</span>: <span class="literal">null</span></pre></div></div>
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<p>Selector for a fallback element which is shown if the collection is empty.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">fallbackSelector</span>: <span class="literal">null</span></pre></div></div>
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<p>The actual element which is fetched using <code>fallbackSelector</code></p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">$fallback</span>: <span class="literal">null</span></pre></div></div>
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<p>Selector for a loading indicator element which is shown
while the collection is syncing.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">loadingSelector</span>: <span class="literal">null</span></pre></div></div>
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<p>The actual element which is fetched using <code>loadingSelector</code></p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">$loading</span>: <span class="literal">null</span></pre></div></div>
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<p>Selector which identifies child elements belonging to collection
If empty, all children of $list are considered.
Not null, because of Zepto bug <a href="https://github.com/madrobby/zepto/pull/768">https://github.com/madrobby/zepto/pull/768</a>.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">itemSelector</span>: <span class="literal">undefined</span></pre></div></div>
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<h2 id="filtering">Filtering</h2>
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<p>The filter function, if any.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">filterer</span>: <span class="literal">null</span></pre></div></div>
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<p>A function that will be executed after each filter.
Hides excluded items by default.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">filterCallback</span>: <span class="function"><span class="params">(view, included)</span> -></span>
view.$el.stop(<span class="literal">true</span>, <span class="literal">true</span>) <span class="keyword">if</span> $
toggleElement (<span class="keyword">if</span> $ <span class="keyword">then</span> view.$el <span class="keyword">else</span> view.el), included</pre></div></div>
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<h2 id="view-lists">View lists</h2>
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<p>Track a list of the visible views.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">visibleItems</span>: <span class="literal">null</span></pre></div></div>
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<h2 id="constructor">Constructor</h2>
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<div class="content"><div class='highlight'><pre> <span class="attribute">optionNames</span>: <span class="attribute">View</span>::optionNames.concat [<span class="string">'renderItems'</span>, <span class="string">'itemView'</span>]
<span class="attribute">constructor</span>: <span class="function"><span class="params">(options)</span> -></span></pre></div></div>
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<p>Initialize list for visible items.</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@visibleItems</span> = []
<span class="keyword">super</span></pre></div></div>
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<h2 id="initialization">Initialization</h2>
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<div class="content"><div class='highlight'><pre> <span class="attribute">initialize</span>: <span class="function"><span class="params">(options = {})</span> -></span></pre></div></div>
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<p>Don't call super; the base view's initialize is a no-op.</p>
<p>Start observing the collection.</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@addCollectionListeners</span>()</pre></div></div>
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<p>Apply a filter if one provided.</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@filter</span> options.filterer <span class="keyword">if</span> options.filterer?</pre></div></div>
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<p>Binding of collection listeners.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">addCollectionListeners</span>:<span class="function"> -></span>
<span class="property">@listenTo</span> <span class="property">@collection</span>, <span class="string">'add'</span>, <span class="property">@itemAdded</span>
<span class="property">@listenTo</span> <span class="property">@collection</span>, <span class="string">'remove'</span>, <span class="property">@itemRemoved</span>
<span class="property">@listenTo</span> <span class="property">@collection</span>, <span class="string">'reset sort'</span>, <span class="property">@itemsReset</span></pre></div></div>
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<h2 id="rendering">Rendering</h2>
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<p>Override View#getTemplateData, don’t serialize collection items here.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">getTemplateData</span>:<span class="function"> -></span>
templateData = {<span class="attribute">length</span>: <span class="property">@collection</span>.length}</pre></div></div>
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<p>If the collection is a SyncMachine, add a <code>synced</code> flag.</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> <span class="keyword">typeof</span> <span class="property">@collection</span>.isSynced <span class="keyword">is</span> <span class="string">'function'</span>
templateData.synced = <span class="property">@collection</span>.isSynced()
templateData</pre></div></div>
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<p>In contrast to normal views, a template is not mandatory
for CollectionViews. Provide an empty <code>getTemplateFunction</code>.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">getTemplateFunction</span>:<span class="function"> -></span></pre></div></div>
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<p>Main render method (should be called only once)</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">render</span>:<span class="function"> -></span>
<span class="keyword">super</span></pre></div></div>
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<p>Set the $list property with the actual list container.</p>
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<div class="content"><div class='highlight'><pre> listSelector = _.result <span class="keyword">this</span>, <span class="string">'listSelector'</span>
<span class="keyword">if</span> $
<span class="property">@$list</span> = <span class="keyword">if</span> listSelector <span class="keyword">then</span> <span class="property">@$</span>(listSelector) <span class="keyword">else</span> <span class="property">@$el</span>
<span class="keyword">else</span>
<span class="property">@list</span> = <span class="keyword">if</span> listSelector <span class="keyword">then</span> <span class="property">@find</span>(<span class="property">@listSelector</span>) <span class="keyword">else</span> <span class="property">@el</span>
<span class="property">@initFallback</span>()
<span class="property">@initLoadingIndicator</span>()</pre></div></div>
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<p>Render all items.</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@renderAllItems</span>() <span class="keyword">if</span> <span class="property">@renderItems</span></pre></div></div>
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<h2 id="adding-removing">Adding / Removing</h2>
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<p>When an item is added, create a new view and insert it.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">itemAdded</span>: <span class="function"><span class="params">(item, collection, options)</span> =></span>
<span class="property">@insertView</span> item, <span class="property">@renderItem</span>(item), options.at</pre></div></div>
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<p>When an item is removed, remove the corresponding view from DOM and caches.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">itemRemoved</span>: <span class="function"><span class="params">(item)</span> =></span>
<span class="property">@removeViewForItem</span> item</pre></div></div>
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<p>When all items are resetted, render all anew.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">itemsReset</span>:<span class="function"> =></span>
<span class="property">@renderAllItems</span>()</pre></div></div>
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