How to logout my application when I closed the window?

Question

In my chat application i am having the logout button and it works fine.

Now I need to logout the application when I closed the browser window also..How can I achieve

Answer 1

There is no exact way to do this with the clientside. There is no event that is fired when the page is exited. It should be done with the Session End event on the server.

You can try to use onbeforeunload or unload, but race conditions will prevent that from happening. AND they do not fire for browsers crashing, lost internet connection, etc.

Answer 2

Another approach is some sort of "keepalive": the browser page "pings" the server with a small ajax request every minute or so. If the server doesn't get the regular pings, the session is closed and can no longer be used.

As an optimization, the pings can be skipped if we have made another request to the server in the interim.

Advantages:

• still works with multiple windows open
• no problem with F5 / refresh
• can provides some usage statistics to the server

Disadvantages:

• when the window is closed, there is a delay before the user is logged out
• uses a little network bandwidth
• additional load on the server
• users might have concerns about the page constantly "phoning home"
• more difficult to implement

I've never actually done this in a web app, and not sure if I would; just putting it out there as an alternative. It seems like a good option for a chat app, where the server does need to know if you are still there.

Rather than polling / pinging, another possibility is to keep a "long running request" open while the page is open. A chat app needs some such socket to receive new messages and notifications. If the page is closed, the socket is closed too, and the server can notice that it has been closed. It then waits a brief time for the client to establish a new socket, and if it doesn't we assume the page is closed and delete the session. This would require some slightly unusual software on the server.

Answer 3

I got the Solution by,

window.onunload = function () {
    //logout code here...
}

Thanks for all who supported me...