confirm msg on onUnload?

Nithya Venkatachalam · Aug 30, 2004

Hi,

Is there anyway to display a confirm msg onUnload of a page?

I mean to say if iam calling onUnload=javascript:check();

and in check(){

if(confirm("check?"))
{
unload the page;
}
else
{
Dont unload , just come back to the previous state( i have some
values in text fields to be retained)
}
}

I want to call this function on Unload.
Suggest me a way.

Martin Honnen · Aug 30, 2004

Nithya said:
Is there anyway to display a confirm msg onUnload of a page?

I mean to say if iam calling onUnload=javascript:check();

and in check(){

if(confirm("check?"))
{
unload the page;
}
else
{
Dont unload , just come back to the previous state( i have some
values in text fields to be retained)
}
}

I want to call this function on Unload.

You should set
event.returnValue = 'Check?'
e.g.
<body onunload="event.returnValue = 'Check?';">
that is all that is allowed, then your message will appear in the same
confirmation dialog the default confirmation message is in.

Michael Winter · Aug 30, 2004

On 30 Aug 2004 06:22:00 -0700, Nithya Venkatachalam <[email protected]>
wrote:

I'm assuming this is for the Web. If you're actually writing something for
a more restricted environment where you know precisely what browsers will
be used, say so. The advice might change.

Is there anyway to display a confirm msg onUnload of a page?

The practical answer is no. Whilst you *might* be able to display a
message or perform some action, you certainly can't prevent the browser
from closing[1]. The only reliable approach is to ensure you cater for a
user leaving abnormally (setting automatic session timeouts on the server,
etc.).

Moreover, any script approach can be disabled or skipped by a user.

I mean to say if iam calling onUnload=javascript:check();

<body ... onunload="check()">

[snip]

Mike

[1] Granted, IE allows cancellation using onbeforeunload, but not everyone
uses IE.

Martin Honnen · Aug 30, 2004

Martin said:
You should set
event.returnValue = 'Check?'
e.g.
<body onunload="event.returnValue = 'Check?';">

That should be
<body onbeforeunload="event.returnValue = 'Check?';">

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confirm msg on onUnload?

Nithya Venkatachalam

Martin Honnen

Michael Winter

Martin Honnen

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