javascript - how to bind an close event to window.open() -


i have following function open url in window pop up:

function windowpopup(url, width, height) {   // center    var left = (screen.width / 2) - (width / 2),       top = (screen.height / 2) - (height / 2);    handle=window.open(     url,     "",     "menubar=no,toolbar=no,resizable=yes,scrollbars=yes,width=" +      width + ",height=" + height + ",top=" + top + ",left=" + left   ); }

i want able detect when window closed execute code. how can use handle in function bind unload or close?

i want know once window has been closed after shares twitter:

windowpopup("https://twitter.com/intent/tweet/?text=check%20out%20this%20website!&url=https%3a%2f%2fgoogle.com%2f", 500, 300);

update

i updated lar's suggestion:

function windowpopup(url, width, height) {   // center    var left = (screen.width / 2) - (width / 2),       top = (screen.height / 2) - (height / 2);      handle=window.open(     url,     "",     "menubar=no,toolbar=no,resizable=yes,scrollbars=yes,width=" +      width + ",height=" + height + ",top=" + top + ",left=" + left   );    handle.onbeforeunload = function() {     alert('bye!');   }  }

while worked pop windows didn't work when closed twitter window...

you’re looking beforeunload event:

handle.onbeforeunload = function() {   console.log('bye!'); }

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