title: AngularJS - Email error message on Textbox Blur
body: <p>I have implemented AngularJs email validation as below :-</p>
  
  <pre><code>&lt;div class="control-group" ng-class="{'has-success': contactform.contactemail.$valid &amp;&amp; submitted,'has-error': contactform.contactemail.$invalid &amp;&amp; submitted }"&gt;
       Email
      &lt;input type="email" class="form-control" id="contactemail" name="contactemail" ng-model="user.contactinformation[0].email" /&gt;
      &lt;p class="help-block" ng-show="contactform.contactemail.$error.email"&gt;Not valid email!&lt;/p&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>But as the user start typing his email in the Textbox, Error Msg gets displayed instantly which doesn't look good.</p>
  
  <p>How to show error msg at time of user leaving the textbox?</p>