title: angular - access the element from ng-disabled
body: <p>I want to pass <code>this</code> (the element) - a <code>button</code> to my <code>controller</code> by <code>ng-disable</code>.
  here is my <code>HTML</code>:</p>
  
  <p></p>
  
  <pre><code>&lt;button type ="button" class = "btn btn-default" ng-click= "open()" ng-disabled = "checkRowId(this)"&gt;
  &lt;/button&gt;
  </code></pre>
  
  <p>And my <code>controller</code> :</p>
  
  <pre><code>$scope.checkRowId = function(btn){
     console.log(btn); //undefined
  }
  </code></pre>
  
  <p>The log shoes <code>undefined</code>, is there a way to pass a <code>element</code> like a <code>button</code> via <code>ng-disabled</code>?</p>