JavaScript-Load-Image afte Crop Add to jQuery-File-Upload

JavaScript demo of image uploading Can I add the result from cropping to file upload? jQuery File Upload

 file.canvas = $j('#result canvas');
 file.type = 'blob';

 $('#fileupload').fileupload('add', {files: file});

      

        
        
        
      

    

Does not work

$('#fileupload').fileupload('add', {files: $j('#result a').attr('href')});

      

        
        
        
      

    

Does not work