JQuery Tutorial 32 - How to enable button after file selection

Code:
<html lang="en">
<head>
 <title>JQueryexamplecode.blogspot.com</title>
   <script src="js/jquery.js" type="text/javascript"></script>
</head>
<body>
 <input id="fileUPload" type="file" />
 <button id="btnUpload">Upload</button>
 
 <script>
  $('#btnUpload').attr('disabled',true);
  
  $('input[type="file"]').change(function(){
   $('#btnUpload').attr('disabled',false);
  })
 </script>
</body>                                                                                  
</html>
Output:



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