title: ng-model and value combination not working for input text box
body: <p>I'm having two input text box.
  I need to combine the values entered in two text boxes and display it in the third.
  I'm able to display it if I use only the <code>value</code> in the third text box.</p>
  
  <p>Box 1:</p>
  
  <pre><code> &lt;input type="text" ng-model="entity.name"&gt;
  </code></pre>
  
  <p>Box 2:</p>
  
  <pre><code> &lt;input type="text" ng-model="entity.code"&gt;
  </code></pre>
  
  <p>Box 3:Box1+Box 2</p>
  
  <pre><code>  &lt;input type="text" value="{{entity.name+ ' + ' + entity.code}}"&gt;
  </code></pre>
  
  <p>However if I use a model name in the third box, the logic doesn't seem to be working:</p>
  
  <pre><code> &lt;input type="text" value="{{entity.name+ ' + ' + entity.code}}" 
          ng-model="entity.fullCode"&gt;
  </code></pre>
  
  <p>Can anyone suggest a fix ??</p>