How to stop browser from closing using Javascript?

Originally Posted by msubbareddy

Hi,

I also looking for same solution.
If you have found, could you please forward me that solution.
to my email: m_subbareddy@hotmail.com

I also need to do some checking when user close the browser.if the checking returns false, then the window should not be closed even user press 'X' to close; else then let the window closed.

So, forthat I want to implement in the following..
<script language='javascript'>
function onFeforeUnloadAction(){
var flag=window.confirm("You are closing the window. do you want to continue. Click 'Ok' to close or click 'Cancel' to stay back");

if(flag) {
alert("bye");
} else {
// Stop the closing browser
//....
}

}
window.onbeforeunload = function(){if((window.event.clientX<0) || (window.event.clientY<0)){ onBeforeUnloadAction();}
</script>


But, same can be handle by setting the event.returnvalue="mesg". But, how to get to know whether user clicked "Ok" or "Cancel" if we implement following way.

<script language='javascript'>
function onFeforeUnloadAction(){
var flag
var mesg ="You are closing the window. do you want to continue. Click 'Ok' to close or click 'Cancel' to stay back";
return mesg;
}
window.onbeforeunload = function(){if((window.event.clientX<0) || (window.event.clientY<0)){ return onBeforeUnloadAction();}
</script>


Thanks in advance,

~ SubbaReddy

Originally Posted by Mittineague

There is a good reason to confirm a window close. If I filled out a bunch of form inputs, I would appreciate a "last minute warning" before the info was lost. But, if this is done in an annoying way, keep in mind that javascript can't prevent a user from shutting down his computer. And you can bet they'll NEVER come back.

Originally Posted by KKarthikeyan

var needToConfirm = false;

function setDirtyFlag()
{
needToConfirm = true; //Call this function if some changes is made to the web page and requires an alert
// Of-course you could call this is Keypress event of a text box or so...
}

function releaseDirtyFlag()
{
needToConfirm = false; //Call this function if dosent requires an alert.
//this could be called when save button is clicked
}


window.onbeforeunload = confirmExit;
function confirmExit()
{
if (needToConfirm)
return "You have attempted to leave this page. If you have made any changes to the fields without clicking the Save button, your changes will be lost. Are you sure you want to exit this page?";
}

Originally Posted by Itsacon

My usual response:
The question is not how but why??
If a user wants to close his browser, that's his god-given right!

If you don't want him to close it, make it so there's something interesting in the window. (Naked women seem to do the trick for a lot of people)

Originally Posted by MuraliMohanRao

Hellow Itsacon,

Think in this scenario : Suppose 'X' user is login in to the application and the application wound not allow the same user to login by using another browser. for maintaining this we are updating one flag in the Database while login and logout. once the user close the browser means he can not logout by using the browser. so technically still the user is in logged in state, so application would not allow that user until logout but the user has closed the browser, he can not logged out because browser is not there
So while closing the browser application has to assist to the user by displaying the alert message.