How to properly log out of facebook

Question

This is a repeated question and I have followed both the suggestions provided in these StackOverflow links:

• How to log-out users using FaceBook connect in php and zend
• Trouble logging out of a FaceBook connect site and destroying sessions

The issue is - the code works 90% of the time. Thats the weird part. Out of the 100 times I've logged in and out - I've experienced this problem 5-6 times and 2 of my beta test users have reported the same issue.

So when it works- if u click the logout link - u get the facebook popup saying - you being logged out - when it does'nt work - absolutely nothing happens - the page does not refresh - it just sits on that page doing nothing.

This is the javascript code that gets called on clicking logout

function logout()
{
   FB.Connect.get_status().waitUntilReady(function(status) {
   switch(status) {
      case FB.ConnectState.connected:
        FB.Connect.logoutAndRedirect("http://www.example.com/login/logout");
        break;
      case FB.ConnectState.userNotLoggedIn:
        window.location = "http://www.example.com/login/logout";
        break;
}
});
return false;          
}

This is the php code:

$this->_auth->clearIdentity();
$face = Zend_Registry::get('facebook');
$fb = new Facebook($face['appapikey'], $face['appsecret']);
//$fb->clear_cookie_state();
$fb->expire_session();

Anyone experienced such sporadic issues. Thanks

Answer 1

It looks and sounds as though the waitUntilReady function never becomes "ready" and thereby prevents the rest of the code from executing. Perhaps try the following and let us know if it solves the problem:

function logout()
{
   var status = FB.Connect.get_status();
   switch(status) {
      case FB.ConnectState.connected:
        FB.Connect.logoutAndRedirect("http://www.example.com/login/logout");
        break;
      case FB.ConnectState.userNotLoggedIn:
        window.location = "http://www.example.com/login/logout";
        break;
   }
   return false;
}