angularjs - How do I prompt a modal when the user leaves my website in Javascript/Angular? -

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is there way in angular or javascript detect user leaving website (can closing browser or entering page) , prompt modal? in modal want ask user why leaving.

also, oke have this? website black listed due "annoying: feature?

with angular use 

$scope.$on("$locationchangestart",function(){      //do stuff here });

to detect when user leaves page.

if use alert('your message');, browser problably give user option block alerts site.


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