AJAX- Destroying session on closing browser tab or body unload

**vineet** · 11-22-2008, 11:42 AM

hi all

i have my logout.php which destroys sessions and session ids on click of logout buton. I want to have same effect means i want to call this logout.php script when the user closes the "browser tab".

as these are the days of "browser tabs" so this is very important for me.

when the user closed the whole browser or logout then all session and session ids are destroyed automatically but these sessions are not destroying when the user closes the "browser tab".

I have tried ajax also but not able to get the result as i m not much in ajax. So it would be great if somebody helps me with calling my logout.php script on closing "browser tab".

This is ajax script

Code:

<script type="text/javascript">
function ajaxFunction()
{
var xmlHttp;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    try
      {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    catch (e)
      {
      alert("Your browser does not support AJAX!");
      return false;
      }
    }
  }
  xmlHttp.onreadystatechange=function()
    {
    if(xmlHttp.readyState==4)
      {
      document.myForm.time.value=xmlHttp.responseText;
      }
    }
  xmlHttp.open("GET","customer_logout.php",true);
  xmlHttp.send(null);
  }
</script>

This is my customer_logout.php script

Code:

<? require_once("config.php");
$unique_id = session_id(); 
session_regenerate_id();
$qry="delete from cart_table where unique_id='$unique_id'";
mysql_query($qry);
$_SESSION = array(); 
session_unset();
session_destroy();
header("Location:index.php"); 
?>

This is i calling ajax in html

Code:

<body onunload="ajaxFunction()">

vineet

**pankaj.ghadge** · 11-22-2008, 01:14 PM

May be this function will help you ................
But,
A browser tab is a window. There is no specific way to determine if it is a tab or an actual window that you are closing (using javascript).

Code:

<script language="JavaScript">
  window.onbeforeunload = confirmExit;
  function confirmExit()
  {
    return "You have attempted to leave this page.  If you have made any changes to the fields without clicking the Save button, your changes will be lost.  Are you sure you want to exit this page?";
  }
</script>

**vineet** · 11-22-2008, 01:46 PM

Originally Posted by pankaj.ghadge

May be this function will help you ................
But,
A browser tab is a window. There is no specific way to determine if it is a tab or an actual window that you are closing (using javascript).

Code:

<script language="JavaScript">
  window.onbeforeunload = confirmExit;
  function confirmExit()
  {
    return "You have attempted to leave this page.  If you have made any changes to the fields without clicking the Save button, your changes will be lost.  Are you sure you want to exit this page?";
  }
</script>

First thing is that The your code provided is asking for the confirmation everytime i refresh the page. confirmation should come only on body unload.

Second thing i would like to ask that i have
function ajaxFunction().
I want to call this function means this function should work only when the person presses ok on our confirm alert and if he presses cancel then this function should not work. also i dont want to call this ajax function on body unload, its causing problem. it should be called only if the person presses ok.

how can i call this function on ok. if you tell me this it would be great help.

vineet

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