Use for on refresh event
window.onbeforeunload = function(e) {
return 'Dialog text here.';
};
https://developer.mozilla.org/en-US/docs/Web/API/window.onbeforeunload?redirectlocale=en-US&redirectslug=DOM%2Fwindow.onbeforeunload
And
$(window).unload(function() {
alert('Handler for .unload() called.');
});