Created
November 15, 2021 11:35
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JS to confirma page close/leave
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| window.onbeforeunload= (e)=> {e.returnValue="This page is asking you to confirm that you want to leave - data you have entered may not be saved."} |
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Modern browsers ignore the string (text will be translated in local language).
String is taken from recent FireFox.
returnValue is more supported than preventDefault