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How to trigger the 'Leave Page' 'Changes will be lost' message on new Widget

PavelP
Mega Sage
Hello,
I have a tricky question - I have a requirement to show the "Leave Page" message, when the user tries to click from updated custom widget without saving, via breadcrumbs or the back button.
PavelP_1-1702630692956.png

 

We know it's possible because it works on the standard Cat Item widget, but there is only the following mention of the "Leave page" message - no mention of how is it triggered.

 


<now-message key="Changes you made will be lost." value="${Changes you made will be lost.}" />
<now-message key="Leave page?" value="${Leave page?}" />


I'd assume it was something in Client Script, but I'm really not sure what to look for. Any hints on what could be the trigger, so we can recreate it?

Thanks
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