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[javascript] Capture the close event of popup window in JavaScript

I need to perform some action before a popup window(using window.open ) closes.

Something like will be good:

var new_window = window.open('some url')
new_window.onBeforeUnload = function(){ my code}

How can I achieve that?

This question is related to javascript dom-events

The answer is

Source: Stackoverflow.com

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