gistfile1.txt

<form ng-message-include="form-messages">
  <input class="form-control" type="text" name="first_name" id="input_first_name" ng-model="data.first_name" required />
  <div class="error-messages" ng-if="interacted(my_form.first_name)" ng-message="my_form.first_name.$error">
    <div ng-message-on="required">You did not enter your first name</div>
  </div>

  <input class="form-control" type="text" name="last_name" id="input_last_name" ng-model="data.last_name" required />
  <div class="error-messages" ng-if="interacted(my_form.last_name)" ng-message="my_form.last_name.$error">
    <div ng-message-on="required">You did not enter your last name</div>
  </div>
</form>