Have you ever seen a page that warns you with a popup if you try to leave the page? I haven't looked into every possible way they do that, but I imagine they capture the event in Javascript and then act on it (see below). You might consider implementing something like that as a way to prevent users from leaving the page (closing the tab) or even refreshing the page. Just include in the message that they'll have to log in again if they proceed.
I found this code on stack overflow for use with jQuery:
$(window).bind('beforeunload', function(e) {
// Your code and validation
if (confirm) {
return "Are you sure?";
}
});
Here is an example without jQuery:
window.onbeforeunload = function (evt) {
var message = ‘Are you sure you want to leave?’;
if (typeof evt == ‘undefined’) {
evt = window.event;
}
if (evt) {
evt.returnValue = message;
}
return message;
}
