Classic asp application - We need to track when user directly closes the page instead of logging out. This is needed to clear session values.

Hello Experts,

In our classic asp application which serves hotel industry, when a user logs out the application, we will clear the sessions so that other system users will not able to login with the URL without logging in with the credentials.

But when the user directly closes the pop-up window or the browser tab or when the page is reloaded/refreshed we are not able to track it to clear the session. Need help on this, please.

This is the code we use:



When we use window.onbeforeunload function

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
     
         $("li a").click(function () {
            window.onbeforeunload = null;
        });
             $("a").click(function () {
            window.onbeforeunload = null;
        });
        $("a").not('#lnkLogOut').click(function () {
            window.onbeforeunload = null;
        });
        $(".btn").click(function () {
            window.onbeforeunload = null;
        });
    });
    function getxmlobject() 
    { var x = null; 
        try { x = new xmlhttprequest(); }
        catch (e) { try { x = new activexobject("msxml2.xmlhttp"); }
            catch (e) { x = new activexobject("microsoft.xmlhttp"); } } return x; 
    }

    window.onbeforeunload = function (e) {
        debugger;
        
        if (show_close_alert) {
     
            var xmlLoginvalues = GetXmlObject();

            if (xmlLoginvalues == null) { alert("Can't get Account code"); }
            var url = "../User/AjaxFunctions.asp?Mode=ClearSession";
            alert(url);
            xmlLoginvalues.open("GET", url, false);
            xmlLoginvalues.send(null);
            var LoginCredentials = xmlLoginvalues.responseText;
             window.location.href = "../logout.asp";
           // return false;
        }
        else
            window.location.href = TargetFile;

    }
   
    function unhook() {
        show_close_alert = false;
    }
    
</script>


Logout.asp page

<%@ Language=VBScript %>
<!--#include file="xxxx.asp" -->
<!--#include file="xxxx.asp" -->
<%
Call OpenConnection() 
pid = Session("PID")
WId   = Session("UID")    
ud     = Session("UName")
If Session("ViaMaster") <> "Yes" Then Call SaveLogDetails(ConnObj,Wid,session.SessionID,pud,uid,0,"PXX")

Session("ViaMaster") =""

  Response.Buffer = True
  Response.Expires = 0
  Response.CacheControl = "no-cache"
  Response.ExpiresAbsolute = now() -2

OnlineSystem = Session("OnlineSystem")
%>

<%
'### Clearing the session variables ###
session.Abandon()


strSQL2 = "delete from DATABASE2..Config where SessionID='"&Session("myGuid")&"'"
ConnObj.Execute(strSQL2)
Call CloseConnection() 
If Session("Distributor")="xxxs" then
    Response.Redirect "loginpage/XXXLogin.html"
else
   
    Response.Redirect "login.asp"
end if' redirecting  to login.asp
%>

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Thanks,
Gracesoft