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    <p>you've probably also seen something like this:</p> <pre><code>&lt;div ng-class="{true: 'complete'}[item.Id != 0]"&gt;&lt;/div&gt; </code></pre> <p>Very rad syntax.</p> <p><strong><em>EDIT:</em></strong> What happens here, is that the "<code>complete</code>" <code>class</code> is added to the element <code>if(item.Id != 0)</code>. Alternatively, we could write: <code>&lt;div ng-class="{false: 'cookieless'}[monsterEatsCookies('Elmo')]</code>. As its decided by the monsterEatsCookies function, Elmo does not eat cookies so since this function returns <code>false</code> the html element gains a class called <code>cookieless</code>.</p> <p>A simple example: <code>&lt;div ng-class="{false: 'DoubleNegative'}[1 == 0]</code>. <code>1 !== 0</code> which is "<code>false</code>" -- the "<code>DoubleNegative</code>" class is added to the element.</p> <pre><code>&lt;div ng-class="{ true: 'complete' } [item.Id != 0]"&gt;&lt;/div&gt; </code></pre> <p>`</p> <pre><code> | | | | | | | | | |result| |className | | | | | | | | | | function | | | condition | </code></pre> <p><em>Addendum</em></p> <p>Also, I just realized that you can use a variety of different keys to map to your condition. For example:</p> <p><code>ng-class="{ true: 'highlight', undefined: 'mute' }[ item.hasValue ]"</code></p> <p>The <code>mute</code> class will be applied if item has no "<code>hasValue</code>" property. Furthermore, you can apply a class for any given type or value:</p> <p><code>{'Jonathan Chapman': 'embolden', '[object Object]': 'hide'}[ item.toString() ]</code></p> <p>In the following collection, this would embolden a person's name while hiding items that are objects:</p> <pre><code>[ 'Jonathan Chapman', { aka: 'Johnny Applyseed' }, 'Brad Pitt', { details: 'Fights Zombies' } ] </code></pre> <p>With this, you could watch for specific values in any $scope property. I suppose this could come in very handy at times.</p> <p>Cheers</p>
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    1. POWhat angularjs expression syntax is this in ng-class
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    1. COIt would be rad if you'd explain what that syntax does, and why, for me and other future readers.
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    2. COThanks XMLilley, I'll put it in the edits :)
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    3. COSo, the bracketed expression following the object/map is a conditional? Is that syntax actually documented anywhere? Thanks!
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