title: Angularjs ng-model is undefined
body: <p>In HTML I have this line of code:</p>
  
  <pre><code> &lt;input type="text" class="training-comment" placeholder="Enter comment" ng-model="content" data-ui-keypress="{13:'keypressCallback($event)'}"&gt;
  </code></pre>
  
  <p>And in controller this:</p>
  
  <pre><code>$scope.keypressCallback = function ($event) {
      console.log("comment is", $scope.content);
      $event.preventDefault();
  };
  </code></pre>
  
  <p>And when I enter some text in input and press enter in console I see that $scope.content is undefined.</p>
  
  <p>Why is this ?</p>