I am working on a page that I have nothing to type but a dropdown to select, but in IE11 when I try to move on to the next page, it will pop up the message. I would like to prevent this pop up from happening. So I just wonder what is the default behavior of that pop up in IE11(As it does not appear in either Chrome or Firefox) and how to prevent the pop up

I am working on a page that I have nothing to type but a dropdown to select, but in IE11 when I try to move on to the next page, it will pop up the message. I would like to prevent this pop up from happening. So I just wonder what is the default behavior of that pop up in IE11(As it does not appear in either Chrome or Firefox) and how to prevent the pop up

• javascript
• jquery
• internet-explorer-11

• 1 that "popup" sounds very much like the onbeforeunload popup. Are you sure you aren't using the onbeforeunload callback somewhere within your code? – Kevin B Commented Mar 20, 2014 at 14:38
• 1 ↑↑↑ Please check: alert(window.onbeforeunload); – A. Wolff Commented Mar 20, 2014 at 14:38

2 Answers 2

A more important question to ask is: "Why IE11 is popping up that alert?".

Are you leaving a secure page for an insecure one? I.e. make sure to call the secure booking API, or let the browser choose, by not explicitly specifying the protocol:

var url = '//api.booking_site.url/api_endpoint';

This will call either the secure or insecure version of the url depending if you're currently browsing a secure or insecure site.

If you just want to get rid of the pop-up, assuming the pop-up you mention is an alert box, you can overwrite alert:

window.alert = function() { return true; }

This looks like it's a result of the return value from onbeforeunload. Apparently, instead of returning null you should return nothing.

See also onBeforeUnload handler says null in IE