onUnload method on plugin WordPress

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I’m creating a plugin for WordPress. But
I can’t enter the method onUnload.

I tried to include it in the body tag, but doesn’t work.

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Is there a way to use this method?

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2 comments

  2. Solution by OP.

    <script type=”text/javascript”>

window.onbeforeunload = askUser;

function askUser(){
  return “The changes you made will be lost if you navigate away from this page”;
}

</script>