在javascript中处理IE窗口关闭事件

Question

I need to handle when Internet Explorer (6, 8 and 9) window is closed, in order to ask his confirmation on it. I tried the unbeforeunload , but, as you might know, it's triggered also when any link is clicked, oa form is submited. Some can say to use event mouse coordinates, but there are several ways to break such a validation (Alt+F4 for ex.). There's also a way to set some variable to true when clicking links and check if in the event, but that does not work neither, as I got lots of various links on my pages, and the event is triggered multiple times in some cases.
Also I tried to solve the problem using frames, like: make 2 frames, put my pages to one frame, and to the other (with zero size) put a page with onbeforeunload handler. That would work just fine, but we work with a set of environment js, that we can't prevent to download, and those scripts remove any frames on the page, putting the entire page in the main window - fail…
Can anybody, please, suggest anything else?

Answer 1

If you are going to use onbeforeunload (and it sounds right), you should have a flag that is set so that the event only bothers asking if there is a reason to stay on the page.

var hasChanges = false;

window.onbeforeunload = function() {

    if (hasChanges) {

        return "You have changes that will be lost if you continue leaving the page";

    };

};

Then you just have to set the variable to true ( hasChanges = true ) if there is a reason to stay on the page...so if nothing has changed, clicking your other links will not trigger the dialog.