title: angular bootstrap typeahead + something like ng-enter
body: <p>I've got an input field with a typeahead (which is working correctly).
  Now what I want (and what's not working) is to execute another call when the user writes something into the typeahead text-field and then presses the enter key and there is -no- typeahead catching. (In this case I want to display an error message).</p>
  
  <p>How can this be achieved ? (The following code is my example, though the line with 'ng-enter' doesn't work like this.</p>
  
  <pre><code>&lt;input
     type="text"
     ng-model="vm.activeOrder"
     ng-enter="console.log('show error message maybe')"
     typeahead-on-select="vm.selectOrderInTypeAhead($item, $model, $label)"
     typeahead="order as order.order_number for order in vm.get OrdersForTypeAhead($viewValue)"
    class="form-control"&gt;
  </code></pre>