title: angular.js on-keyup doesn't work
body: <p>I would like to make a javascript alert/call a function onkeyup.</p>
  
  <p>But it doesn't work. see <a href="http://plnkr.co/edit/ELsKA8VaUx87X9msYWEE?p=preview" rel="nofollow">Plunker</a></p>
  
  <p>Simply:</p>
  
  <pre><code>&lt;input ng-keyup="alert('hi')"&gt;
  </code></pre>
  
  <p>What's wrong?</p>