title: How can controller talk to a directive in AngularJS?
body: <ul>
  <li>I have a app that displays 4 flash cards, 3 of them are populated by one directive</li>
  <li>for 1 last card, I would like the value to depend on a controller</li>
  <li><p>Based on the view(and corresponding controller), controller can fill in the value of the 4th card.</p></li>
  <li><p>For demo purposes, please see <a href="http://plnkr.co/edit/OCKgO0pbFm1x5HxXpccs?p=preview" rel="nofollow">here</a></p></li>
  </ul>
  
  <p><strong>Question</strong><br>
  - How can I update the value in the 4th card from some controller?<br>
  - Is it even a good idea to push values from some controller to directive?<br>
  - What could be the best possible solution?  </p>
  
  <p>I am Angular newbie and getting my head around it</p>