Unbind window.onbeforeunload() cancel

Question

i'm binding a function to an event with

window.onbeforeunload = function() {
 somefunction()
}

which is working on unload as planned, but if they cancel the onbeforeunload the function is still attached, is it possible to check if the user cancels onbeforeunload

possible duplicate of [window.onbeforeunload handling ok and cancel options](http://stackoverflow.com/questions/5579326/window-onbeforeunload-handling-ok-and-cancel-options) — showdev, Nov 18 '13 at 20:26

score 31 · Accepted Answer · edited May 05 '16 at 18:14

31

Actually, I found it was quite easy: I just set

window.onbeforeunload = null;

for each click before it was run, allowing the event handler to be run afterwards.

edited May 05 '16 at 18:14

wizzwizz4

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answered Nov 18 '13 at 20:32

James Kirkby

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I'm trying to find a way to suppress the Leave/Stay prompt conditionally, but haven't figured this out yet. If the form is dirty, then I'd like to prompt the user otherwise skip that. Any suggestions? – PongGod Apr 15 '21 at 19:40
return undefined should work to supress the prompt. more info: https://stackoverflow.com/questions/7317273/warn-user-before-leaving-web-page-with-unsaved-changes – Topman May 17 '22 at 06:09

woss · Answer 2 · 2015-04-14T15:42:23.330

3

or you can just return null

window.onbeforeunload = function() {
  return null;
};

I am using following snippet for that: window.onbeforeunload gist

edited Apr 14 '15 at 15:42

answered Apr 14 '15 at 15:34

woss

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This doesn't work for me. I still get the Leave/Stay prompt popping up. – PongGod Apr 15 '21 at 18:27
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@PongGod: return undefined should work. more info: https://stackoverflow.com/questions/7317273/warn-user-before-leaving-web-page-with-unsaved-changes – Topman May 17 '22 at 06:00

score 0 · Answer 3 · edited May 23 '17 at 12:09

0

also I just add more suggestion with following answer. https://stackoverflow.com/a/20057278/3710376

It can run a function and ignore any popup confirmation.

window.onbeforeunload = function() {
 somefunction()
 window.onbeforeunload = false;
}

edited May 23 '17 at 12:09

Community

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answered Jun 24 '14 at 02:42

user3710376

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Unbind window.onbeforeunload() cancel

3 Answers3