Is there a way to detect if browser has been closed in a asp.net web mvc 5.0 project?

Question

I am using tempdata for a variable and current have it set in the home controller and in my first last controller I have it removing that key by doing if(TempData.ContainsKey()) TempData.Remove(). I placed that there assuming the user will go from point A to point D where D is the last controller. But I noticed if I close the application throughout any point of the application that the tempdata that was assigned i.e. tempdata["username"] = username will contain the previous value that was entered from the original start of the program and then will be updated after user enters a value to update the key for tempdata. In a asp.net web mvc 5.0 project is there a way to check to see if a browser has been closed so that way I could remove the logic that is inside of the last controller that removes the key into the logic of checking if browser has been closed?

Answer 1

You can detect the tab/browser being closed from javascript using the beforeunload event. Credited Source

window.addEventListener('beforeunload', function (e) {
    // User is closing the tab/browser
    // You can cancel this event by using e.preventDefault();
    // and for older browsers by using  e.returnValue = '';
});

From there you can send a message back to your application using AJAX to handle the temp data removal.

Below using JQuery

$.ajax({
    method: "POST",
    url: "AbandonSession",
    data: { someVar: "some val" }
})
.done(function( msg ) {
    alert( "Session abandoned: " + msg );
});