angular.directive.ng:watch.html

<h1>angular.directive.ng:watch</h1>
<fieldset class="workInProgress">
  <legend>Work In Progress</legend>
  This page is currently being revised. It might be incomplete or contain inaccuracies.
  
</fieldset>
<h2>Description</h2>
<p>The <code>ng:watch</code> allows you watch a variable and then execute 
an evaluation on variable change.</p>
<h2>Usage</h2>
<h3>In HTML Template Binding</h3>
<tt>
  <pre>
&lt;ANY ng:watch="expression"&gt;
  ...
&lt;/ANY&gt;
  </pre>
</tt>
<h3>Parameters</h3>
<ul>
    <li><tt>expression</tt> –
      <tt>&#123;expression&#125;</tt>
      <tt></tt>
      – to eval.</li>
  </ul>
<h2>Example</h2>
<p>Notice that the counter is incremented 
every time you change the text.</p>
<doc:example>
  <doc:source>
&lt;div ng:init="counter=0" ng:watch="name: counter = counter+1"&gt;
  &lt;input type="text" name="name" value="hello"&gt;&lt;br/&gt;
  Change counter: {{counter}} Name: {{name}}
&lt;/div&gt;
  </doc:source>
  <doc:scenario>   it('should check ng:watch', function(){
     expect(using('.doc-example-live').binding('counter')).toBe('2');
     using('.doc-example-live').input('name').enter('abc');
     expect(using('.doc-example-live').binding('counter')).toBe('3');
   });</doc:scenario>
</doc:example>