OnBeforeUnload error in IE 11

Question

Hi All,

I discovered that when I use the onbeforeunload javascript method, no custom error message can be displayed in IE11.
Is that a feasible method of archiving this section?
Secondly, is there a way to trigger ajax when the user presses leave during the onbeforeunload javascript method's pop-up?

Answer 1

Please refer to the following paragraph, hope this help:

In older browsers, the return value of the event is displayed in this dialog. Starting with Firefox 44, Chrome 51, Opera 38, and Safari 9.1, a generic string not under the control of the webpage will be shown instead of the returned string.

Link: https://www.w3schools.com/jsref/event_onbeforeunload.asp