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    <p>What exactly are you tring to acheive?</p> <p>If you want to know when the tab in which your webpage is loaded is closed, then <a href="https://developer.mozilla.org/en/DOM/window.onunload" rel="nofollow noreferrer">window.onunload</a> should help you.</p> <p>If you want to know when another webpage is closed, you cannot do this.</p> <p><strong>UPDATE:</strong><br> You said that you want to know when the user closes the browser or tab. This is not possible.</p> <p>But for your purpose (getting feedback), I think all you need is to differentiate whether the user is navigating to a link in your page, or whether the user is typing another URL(or by clicking a favorite).</p> <p>I think for your requirement, whether the user closes the browser, or whether he types another URL, is the same - the user is navigating away from your site, and at that time you say you want to collect feedback.</p> <p>This can be done in javascript.</p> <blockquote> <p>For all the clicks in your page that might lead to a page refresh (hyperlinks, buttons,...), set a flag.<br> In <code>window.onunload</code>, check whether this flag is set.<br> - If it is set, then the user has clicked a link in your page, do nothing.<br> - If the flag is not set then the user is navigating away, time to collect feedback.</p> </blockquote> <p>Let me know if this would work.</p> <p>PS: Note that popups/any distractions during window.unload can be very annoying. I understand that this probably is the requirements given to you. But if possible, try other mechanisms to collect (voluntary) feedback from the user.</p>
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    1. COI only need to know whether the user is closing the page or just navigating. In window.onunload and window.onbeforeunload, the events trigger for all navigation and also close event. I particularly need to find the browser or window close event.
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    2. COI dont think it is possible to see whether the user is closing the window or not. But for your purpose, I think it is sufficient to see whether the user is navigating via some link in your page, or whether the user has typed another URL (or clicked on a bookmark) to navigate away from your page. Have updated the answer with a possible solution.
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    3. COThat was supposed to be 'voluntary' feedback, btw.
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