title: fileupload function not triggered in knockout
body: <p>hi  im working on knockout and im facing some issue . I have a Knockout form and in that i have a file upload option i want to trigger the even by clicking the upload button </p>
  
  <p><a href="http://jsfiddle.net/sornalingam/MSgdh/3/" rel="nofollow">http://jsfiddle.net/sornalingam/MSgdh/3/</a></p>
  
  <p>above is my fiddle link </p>
  
  <pre><code>        $('input[type=file]').change(function () {
  
              file = this.files[0];
              name = file.name;
  
              alert(name);
  
          });
  </code></pre>
  
  <p>but in the above code it is not triggered . </p>
  
  <p>can anyone help me </p>