angular.Array.count.html

<h1>angular.Array.count</h1>
<div class="angular-array-count"><h2>Description</h2>
<div class="description"><p>Determines the number of elements in an array. Optionally it will count only those elements
for which the <code>condition</code> evaluates to <code>true</code>.</p>

<p>Note: this function is used to augment the <code>Array</code> type in angular expressions. See
<a href="#!angular.Array"><code>angular.Array</code></a> for more info.</p></div>
<h2>Usage</h2>
<div class="usage"><div ng:non-bindable=""><pre class="brush: js; html-script: true;">angular.Array.count(array[, condition]);</pre>
</div>
<h3>Parameters</h3>
<ul class="parameters"><li><code ng:non-bindable="">array – {Array} – </code>
<p>The array to count elements in.</p></li>
<li><code ng:non-bindable="">condition<i>(optional)</i> – {(function()|string)} – </code>
<p>A function to be evaluated or angular expression to be
compiled and evaluated. The element that is currently being iterated over, is exposed to
the <code>condition</code> as <code>this</code>.</p></li>
</ul>
<h3>Returns</h3>
<div class="returns"><code ng:non-bindable="">{number}</code>
– <p>Number of elements in the array (for which the condition evaluates to true).</p></div>
</div>
<h2>Example</h2>
<div class="example"><doc:example>
<pre class="doc-source">
  &lt;pre ng:init="items = [{name:'knife', points:1},
                         {name:'fork', points:3},
                         {name:'spoon', points:1}]"&gt;&lt;/pre&gt;
  &lt;ul&gt;
    &lt;li ng:repeat="item in items"&gt;
       {{item.name}}: points=
       &lt;input type="text" name="item.points"/&gt; &lt;!-- id="item{{$index}} --&gt;
    &lt;/li&gt;
  &lt;/ul&gt;
  &lt;p&gt;Number of items which have one point: &lt;em&gt;{{ items.$count('points==1') }}&lt;/em&gt;&lt;/p&gt;
  &lt;p&gt;Number of items which have more than one point: &lt;em&gt;{{items.$count('points&amp;gt;1')}}&lt;/em&gt;&lt;/p&gt;
</pre>
<pre class="doc-scenario">
  it('should calculate counts', function() {
    expect(binding('items.$count(\'points==1\')')).toEqual(2);
    expect(binding('items.$count(\'points&gt;1\')')).toEqual(1);
  });

  it('should recalculate when updated', function() {
    using('.doc-example-live li:first-child').input('item.points').enter('23');
    expect(binding('items.$count(\'points==1\')')).toEqual(1);
    expect(binding('items.$count(\'points&gt;1\')')).toEqual(2);
  });
</pre>
</doc:example></div>
</div>