Jquery Exit Popup meanwhile trigger a function

Question

My goal is to trigger a pop up function meanwhile the user is going out from my website.

So I want to show a exit popup and in the background show my pop up at the same time.

I already have found different code on internet but no one works well.

Code :

<script type="text/javascript">
  function PopUp() { return 'Do you wnat to leave my site?'; }
  function UnPopIt() { /* no data */ }

  $(document).ready(function() {
  window.onbeforeunload = PopUp;
  });
</script>

Is it possible to trigger a function like a pop up in the background ? I am trying this code but it doesn't work :

function PopUp()
{
    alert ('Do you wnat to leave my site?'); triggerpopup();
}

Answer 1

1,not very understand your needs,but i can't add a comment right now.
2,suppose you want a selfdefined pop(not another alert),then this goes well

function PopUp() { 
  triggerpopup();
  return 'Do you?';
}

function triggerpopup() { 
  console.info('called with default pop') 
}

$(document).ready(function() {
  window.onbeforeunload = PopUp;    
});