It's not a perfect solution, but you can use window.onbeforeunload
(javascript) to check for some condition. The user still has the option
of leaving, but at least they are notified that something is not right.
In one app I work on, some "notifications" are collected as the
administrator makes scheduling changes. We want to send all of the
notifications at one time, so we let the admin continue to work and
click a button when ready. In the event that the notifications have not
been sent when the page unloads, a message pops up to let the admin know
they haven't finished the process. My JavaScript looks like:
function notifications_check(evt)
{
if (pending_notifications)
{
var message = "There are pending notifications. By leaving this
page before sending them, " +
"you risk losing them completely. Are you sure you want to leave?"
if (typeof evt == 'undefined')
{
evt = window.event;
}
if (evt)
{
evt.returnValue = message;
}
return message;
}
}
window.onbeforeunload = notifications_check;
Peace.
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