title: AngularJS: is it possible to invalidate a specific form input field from the controller?
body: <p>I have a text input field for address, whenever the address is entered and search button next to the input field is clicked, I geocode the address and replace the input text with the result from the geocoder. I also set a scope variable 'addressOk'.</p>
  
  <p>is it possible to invalidate this specific form input field according to <code>$scope.addressOk</code> or do I have to write a directive for this address geocoding input that invalidates the form when needed ?</p>