title: Angular validation triggers for textbox has a value
body: <p>I'm trying to make a survey with AngularJS and there is a textbox at the beginning.</p>
  
  <pre><code>    &lt;input type="text" name="name" ng-model="name" 
  placeholder="Name" value="{{answers.name}}" required /&gt;
  </code></pre>
  
  <p>And there are next and previous buttons. </p>
  
  <p>When I click first next and then previous, this textbox still holds the value I entered.</p>
  
  <p>If I click next again, required is triggered although textbox is not empty. Here is the message I display.</p>
  
  <pre><code>&lt;p ng-hide="this.isValid" class="err"&gt;Please fill the form.&lt;/p&gt;
  </code></pre>
  
  <p>Do you have any ideas?</p>