log the alert box that pops up when leaving a page
Question
I want to log alert boxes that pop up when I leave a page(when onbeforeunload, onunload or any other event is triggered while leaving a page). So I have overwritten alert function to record alert function invocations. Then I set window.location to some other url to navigate away from the page. But the problem is that when window.location is executed, it destroys my custom alert function and I can not log it any more. Any suggestion on how to solve it? Edit The page that I want to log its alert box is a third party's page. In order to inspect it, a scrip code is injected to the header of the page like this:
<html> <head> <script> window.alert = function(str){console.log('alert is called: ' + str);}</script> </head> <body onbeforeunload=function(){alert(“you are leaving!”);}> Sample page </body> </html>
When I execute window.location=' http://google.com ' on this page, an alert box pops up, instead of calling that overwritten alert function.
1 answers
solution1
0 2015-07-18 17:44:50
This could save some efforts catching the leave page event:
window.onbeforeunload = function (e) {
var message = "Your confirmation message goes here.",
e = e || window.event;
// For IE and Firefox
if (e) {
e.returnValue = message;
}
// For Safari
return message;
};
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