Disable leave when form auto submit

jQuery(window).bind('beforeunload', function(){
  return "Do you really want to quit the Quiz?";

This method appears prompt but not disable leave on submit time. I want to disable leave on submit time. In my script i use auto submit not from click.
Divya PunjabiAsked:
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You can use this simple script, I use it and this is very easy to set.

or this one which is a fork with more options and the project is more active

By the way, this is no longer possible to display custom message for 'beforeunload', this will display the browser hard-coded message.

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I proposed a script that does exactly what the user need.
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