What events does ie browser trigger when closing tab?

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I have a question about what event will browser trigger when closing tab in the original Internet Explorer(IE). I'm making my own browser based on CHtmlView, it's multi-tabs. When I close tab which navigated to [Live800-Chat window] in IE, I will get a confirm dialog before close. But in my own browser, it closed immediately. What I do when close tab:
1. remove tab control.
2. destory CHtmlView instance of the tab related.
What should I do further more if I want to get the confirm dialog too?
(If I click close button in the page, I can get the confirm dialog correctly. I'm not familiar with java script, so I don't know what events it listened when closing tab.)

What I have tried:

I didn't find any effective method to take a try.

Posted 23-Feb-16 22:22pm

l-O_O-l

Updated 28-Feb-16 16:39pm

v2

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W∴ Balboos, *GHB* · Answer 1 · 2016-02-24T01:57:00

Solution 1

Try HERE for most of the available events.

In particular, <body onunload="myFunction()"> might be of interest.

Posted 24-Feb-16 1:57am

W∴ Balboos, GHB

Comments

l-O_O-l 25-Feb-16 2:07am

I'm sorry, but I'm not ask the events of javascript. What I asked is the events browser post when closing tabs. I'm doing VC++/MFC things.

l-O_O-l · Answer 2 · 2016-02-25T23:27:00

Well, I found that the confirm dialog actually is the result of handling of windows.onbeforeunload() in javascript, just like this:

window.onbeforeunload = function() { 
    return "Are you really want to exit?";
}

So my question now is what is the event for the callback windows.onbeforeunload()?
Can I trigger the event in my own browser? and how?
Does anyone can help?