title: AngularJS copy value to another input on fly
body: <p>I need to bind 1 model to 2 inputs.
  First input should be visible and i use it to set value to model</p>
  
  <pre><code>&lt;input type="text" ng-model="ttl" class="form-control input-sm"/&gt;
  </code></pre>
  
  <p>Second input hidden and i use it for form. I need to keep here actual value of model</p>
  
  <pre><code>&lt;input type="text" name="ttl" value="{{ttl}}" class="form-control input-sm"/&gt;
  </code></pre>
  
  <p>The problem is hidden input always empty.... How to fix it? Thanks.</p>