I have created a button on click of which a script include is called. I am using getXMLWait() for response to come from script include. It takes very much time to have the response from script include because of large processing in my script.
So for a while it looks like nothing is happening after clicking that button.
Is there any way i can show loading form or processing meanwhile on the screen?
i have used showLoadingDialog() method before calling my script include but it is not working..

My script is:

function XYZ() {

showLoadingDialog();

  var sub = new GlideAjax("XYZOrder");

  sub.addParam('sysparm_name', "Order");

  sub.getXMLWait();

  var yes = sub.getAnswer();

  hideLoadingDialog();

}

Please Help!!