How can I make a JavaScript alert before a page closes?

Posted by Nuha on Stack Overflow See other posts from Stack Overflow or by Nuha
Published on 2010-04-14T05:19:58Z Indexed on 2010/04/14 5:32 UTC
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JavaScript

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close

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alert

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html

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page

I want to write JavaScript code that would, when I close the current HTML page, display an alert message like "Are you sure?"

I want to take the value of the button from the alert message, whatever the user pressed. How can I do this?

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