title: Add class dynamically to values based on symbols
body: <p>I wanted to add class dynamically if the integer is positive or negative..
  I tried by calling a function from the HTML but that dosen't seem to be a right way.
  Below is my plunker..</p>
  
  <p><a href="https://plnkr.co/edit/Wqyb80w6z2b9NP9Qjibt?p=preview" rel="nofollow">Add class from html</a></p>
  
  <pre><code>&lt;div ng-repeat="i in test"&gt;
      &lt;span class="test"&gt;  {{getValue(i)}} &lt;/span&gt; 
  &lt;/div&gt;
  </code></pre>
  
  <p>I would like to know if there is any way wherin the signs(+/-) can be identified from the HTML and resolve them in the HTML itself..</p>