Capture event when browser is closing

Derek · Jun 28, 2004

Hello:

I want to capture the event when a browser is closing, to give to the user
the posibility of close or no this browser. When the browser is closing,
this show a confirm window with two buttons: Accept and Cancel.

When press the Accept button, the browser is closing, and when press the
Cancel button, the browser isn´t closing.

I have tried with the event onunload, but this closes first the browser, and
then shows the confirm window.

Can somebody help me?. Thanks.

Martin Honnen · Jun 28, 2004

Derek wrote:

I want to capture the event when a browser is closing, to give to the user
the posibility of close or no this browser. When the browser is closing,
this show a confirm window with two buttons: Accept and Cancel.

When press the Accept button, the browser is closing, and when press the
Cancel button, the browser isn´t closing.

I have tried with the event onunload, but this closes first the browser, and
then shows the confirm window.

IE and recent Mozilla versions implement
<body onbeforeunload="event.returnValue = 'Are you sure you want to
leave?'; return event.returnValue;">

DU · Jun 29, 2004

Derek said:
Hello:

I want to capture the event when a browser is closing, to give to the user
the posibility of close or no this browser. When the browser is closing,
this show a confirm window with two buttons: Accept and Cancel.

When press the Accept button, the browser is closing, and when press the
Cancel button, the browser isn´t closing.

I have tried with the event onunload, but this closes first the browser, and
then shows the confirm window.

Can somebody help me?. Thanks.

Put this in the <head> part of your html file:

<script type="text/javascript">
function init()
{
if(window.addEventListener)
{
window.addEventListener("beforeunload", unloadMess, false);
}
else if(window.onbeforeunload)
{
window.onbeforeunload = unloadMess;
};
}

function unloadMess()
{
var User_Message = "[Your user message here]"
return User_Message;
}
</script>
....
</head>
<body onload="init();" ...>

Note that both Mozilla and MSIE have a default question with Ok and
cancel buttons. You can not modify that part of the modal window.

DU

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Capture event when browser is closing

Derek

Martin Honnen

DU

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