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Custom Messages in BeforeUnload Popups: A Browser Compatibility Saga
Question:
Can you display a custom message in the beforeunload popup, and how do you achieve it?
Answer:
Tl;dr: Custom messages are no longer supported in most modern browsers.
History and Compatibility:
In the past, custom messages could be displayed using methods like confirm, alert, or event.returnValue. However, these methods have been disabled for security reasons.
Current State:
Currently, most major browsers, including Chrome, Opera, Firefox, and Safari, do not allow custom messages in the beforeunload popup.
Workaround for Older Browsers:
If you still need to support older browsers, you can use the following methods:
$(window).bind("beforeunload",function(event) { return "You have some unsaved changes"; });
window.onbeforeunload = function() { return "Leaving this page will reset the wizard"; };
Important Note:
Confirm or alert cannot be used within the beforeunload event handler.
Caveats:
Browser Support and Removal History:
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