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re: Sure you want to leave?—browser beforeunload event VIEW POST

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re: Good observation, although I actually mentioned this in the article: Showing a prompt isn't guaranteed. Just like playing audio on the web, brows...
 

Thanks for your reply.

Little trick.
So, is it impossible to show warning message if there is no user interaction?

There's no harm in trying (a browser might decide that the page is allowed to—perhaps if your user has visited you a lot before) but it's unlikely to work. As per my post, maybe consider using sendBeacon if there's some information you want to exfiltrate from the page before it closes...

Even calling alert() is often disallowed in background pages (or at least delayed until the page gets focus again).

Let us assume.

I have passed complex page which has decades tests.
After passing this page, I get into the test result page.

If I click back button without any interaction in browser, then it goes to test page without confirmation, and I lost test result and should pass complex test again.

I hope it can be resolved.
Any Idea?

Yes, that will go "back", but there are lots of other ways to store state (like your test results) that don't rely on the user keeping a page open.

e.g., indexdb, local storage, building a SPA where 'back' is handled by your code, etc ...

Understand.

Thanks for your kindly help.
Hoping your good post. :)

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