jquery - Create alert message on closing popup window (Javascript) -


i have created code open youtube video in popup few seconds. working in code. need give alert user if he/she going close popup window. problem popup window not related parent window, how can close it?

here code using 

    $(document).ready(function() {      var mywindow;     $("#idview").click(function() {         var vidurl = 'www.youtube.com';         counter();         mywindow = window.open(vidurl, "popupwindow", "width=600, height=400, scrollbars=yes");      });      function counter() {         var n = $('.c').attr('id');         var c = n;         $('.c').text(c);         setinterval(function() {             c++;             if (c <= 41) {                 $('.c').text(c);             }             if (c == 41) {                 $('.c').text(n);             }         }, 1000);     }        setinterval(function() {         mywindow.close();     }, 45000);      window.onbeforeunload = closingcode;      function closingcode() {         alert('hitme');         return null;     }   });

i want fire function before closing popup window.

if want fire function before closing popup window. call right before closing window.

setinterval(function() {   your_callback_function();   mywindow.close(); }, 45000);

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