Browser close confirmation

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Is any solution for this case that users on a Mendix-based portal forget to confirm their action and just close the browser. Any widget that does something like < body onbeforeunload="alert('Do want want to move away from this page?');">
asked
1 answers
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That would be an annoying feature (especially if using an alert ;))

But well you can add the suggested code to your index.html I guess.

answered