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
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
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