How to cancel a file upload using an iframe

I have seen this code from an answer for a previous stackoverflow question:

if (iframeObj.contentWindow.document.execCommand)
    { // IE browsers
        iframeObj.contentWindow.document.execCommand('Stop');
    }
else
    { // other browsers
        iframeObj.contentWindow.stop();
    }

The question can be viewed here But basically the question he asked was that is it possible for a hidden iframe to stop a file from uploading.

Now what I have is a “Cancel” button where when I upload a file, if I want to cancel the upload, then if I click on the “Cancel” button, I want the uploading of the file to stop.

But my question is that with the iframe I have and the “Cancel” button function I have, how is it implemented so that the code above can be used to cancel a file upload in my code?

Below is the form code which consists of the form and the iframe:

  var $  fileImage = $  ("<form action='imageupload.php' method='post' enctype='multipart/form-data' target='upload_target' onsubmit='return stopImageUpload(this);' class='imageuploadform' >" +
    "Image File: <input name='fileImage' type='file' class='fileImage' /></label><br/><br/><label class='imagelbl'>" +
    "<input type='submit' name='submitImageBtn' class='sbtnimage' value='Upload' /></label>" +
    "</p><p class='imagef1_cancel' align='center'><label>" +
    "<input type='button' name='imageCancel' class='imageCancel' value='Cancel' /></label>" +
    "<iframe class='upload_target' name='upload_target' src='#' style='width:0;height:0;border:0px;solid;#fff;'></iframe></form>");

Below is the startImageUpload function where it starts uploading an image, the cancel button click handler function is displayed in this function:

function startImageUpload(imageuploadform){

              $  (".imageCancel").click(function() {
              $  ('.upload_target').get(0).contentwindow
          return stopImageUpload();

    });

      return true;
}

newest questions tagged jquery – Stack Overflow