ansaurus

Question

Answer 1

+3 A:

This is not possible due to the nature of http connections and the web in general. Simply have a timeout (eg. 10 minutes) after which a user gets logged out automatically.

Femaref 2010-06-08 10:44:06

Moreover, JavaScript can be turned off (eventually during page visits) and nothing will be executed on the client side.

Marcel Korpel 2010-06-08 11:29:02

Answer 2

+1 A:

Javascript has an onunload function, so you could do:

<body onUnload="doFunction()">

However this, and other methods are going to be unreliable (I'm not sure in which specific instances it is fired) as it would be a security concern allowing websites to have access to perform many functions on browser onunload.

The best solution would be to have cookies/sessions automatically time out, and also to educate users to logout if the system is sensitive.

Tom Gullen 2010-06-08 10:47:49

You would have to test for each browser the behaviour of the onunload function, and when it is fired you can submit an ajax request, or have a popup window which auto closes once it has performed its required logout script. I think the best way would be a popup, as the onunload function probably wont wait for the ajax request to complete before closing the window.

Tom Gullen 2010-06-08 10:58:12

@Tom Thanks for suggestion, could you please give some codes for the same?

Rick 2010-06-08 11:05:14

Definitely can't open a popup (as in a browser window, I think `alert()` works), pretty sure you can't AJAX either - maybe dumb POST works?

Simon Buchan 2010-06-08 11:11:12

I've seen plenty of websites do popunders/popups when onunload is called, a while back I wrote an auto logout script which popped up a small window that ran some logout code, but again this solution would suffer functionality from popup blockers.@Gaurav, here's some exit popup scripts I found doing a google searchhttp://www.nowsell.com/pop-ups/exit-popup-scripts.html

Tom Gullen 2010-06-08 11:16:02

Wether browserside solution is used, they can fail. So you always need something like a session timeout.

Femaref 2010-06-08 11:17:49

on(before)unload doesn't fire in Opera, as this is very non-standard.

Marcel Korpel 2010-06-08 11:27:54

As I have mentioned in the solution, there are a lot of stages this can fail at, including but not limited to: - Different behaviours of onunload in different browsers - Browsers not supporting onunload - Popup blockers on browser

Tom Gullen 2010-06-08 11:38:31

I'm new to stack overflow, but why does my question not have any ratings when the answer above has 3 ratings even though it is incorrect? (Saying it is not possible is wrong, it is possible but with a lot of limitations).

Tom Gullen 2010-06-08 11:44:44

Perhaps because this solution is not fail-safe, as you said. You simply cannot rely on it if logging off is somehow necessary.

Marcel Korpel 2010-06-08 13:01:53

@Tom I called the method 'onUnload' from Master Page But the problem is it calls every time whenever page unloading, it calls eerytime whenever user move to another page or click on any link which redirect to another page.I will rate your answers, actually the same is not working.

Rick 2010-06-08 16:10:50

Answer 3

A:

If you are using jQuery you could work with

$(window).unload( function () {
  $.ajax({ **your params** });
} );

But I have to agree with Tom Gullen here - your sessions should timeout eventually.

Christina Mayers 2010-06-08 11:17:35

Seriously, why bring jQuery into this? `window.onunload = function(){};` works just fine.

Sean Kinsey 2010-06-08 11:38:02

I didn't say he should _add_ jQuery just for this unload - if he is using it already though, why not? It wont be any slower in any way.

Christina Mayers 2010-06-08 11:57:42

In fact, it will, but only very minimal (I doubt a visitor will notice it): those `$` functions of jQuery have to be parsed using JavaScript (which is not *very* fast). The native function is as short as possible.

Marcel Korpel 2010-06-08 13:04:15

ansaurus

tags:

views:

answers:

Call a method on browser closing

related questions