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Posts Tagged ‘close event’

Detect browser F5 / refresh and X / Close in javascript

Posted by Viral Sarvaiya on May 8, 2012

Below javascript is use to detect wether browser is refereshed or closed.

window.onunload = function (e) {
// Firefox || IE
e = e || window.event;
var y = e.pageY || e.clientY;

if (y < 0) {
else {



Posted in ASP.NET, Javascript, Silverlight | Tagged: , , , , , | 2 Comments »

Window Close Event of Browser

Posted by Viral Sarvaiya on April 12, 2011


recently i get a problem that what if some user accessing my website and close directly browser without logout from the system?

i get good solution with this but this is not 100% secure.

for that we have 2 events in javascript “onbeforeunload” or “onunload”

but onunload event is not working in firefox and some time in IE8 also, so onbeforeunload is suitable for both.

<title>Window Close Event of Browser</title>
<script language="javascript" type="text/javascript">
 function CloseBrowser() {
 alert("Browser is closing");

<body onbeforeunload="CloseBrowser();">



window.onbeforeunload = function() {
    return "Are you sure you want to leave this page bla bla bla?"; // you can make this dynamic, ofcourse...

As we have already discussed that there is no 100% fool proof way to detect the browser close event in a lot of cases, the above technique can fail. For example if the user kills the browser’s process from task manager, there could be many more cases. Yet in a lot of cases, this technique can be handy.

Best of luck and happy programming.

Thank you.

Posted in ASP.NET, Javascript | Tagged: , , , , , | Leave a Comment »

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