Question

I’m using the Facebook API in order to check if the user who visits my page is logged into Facebook or not. I tried everything, couldn’t came up with a solution. I would like to especially state that sandbox mode is off. And my code is right below;

<div id="fb-root"></div>
    <script>

    function fbLoginStatus(response) {
        console.log("Status: "+response.session);
         if(response.session) {
            //user is logged in, display profile div
            alert("Logged in");
         } else {
            //user is not logged in, display guest div
            alert("Not logged in");
         }
     }
      window.fbAsyncInit = function() {
        FB.init({
          appId      : '111111111111111',  // Channel File
          status     : true, // check login status
          cookie     : true, // enable cookies to allow the server to access the session
          xfbml      : true  // parse XFBML
        });
        FB.getLoginStatus(function(response){
            console.log("Hey");
            if(response.session){
                console.log("You are logged in");
            }
            else{
                console.log("You are not logged in");
            }
        });
        // Additional initialization code here
      };
      // Load the SDK Asynchronously
      (function(d){
         var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
         if (d.getElementById(id)) {return;}

         js = d.createElement('script'); js.id = id; js.async = true;
             js.src = "http://connect.facebook.net/en_US/all.js";
          ref.parentNode.insertBefore(js, ref);
        }(document));

    </script>

Answer 1

FB.getLoginStatus is the function that is used to detect if user is logged into FB or not. In the callback of function you are checking response.session but as per my understanding this session is not a valid attribute of returning JSON object. You should use response.status. So code will become like below.

   FB.getLoginStatus(function(response) {
  if (response.status === 'connected') {
    alert("LOG IN");
  } else if (response.status === 'not_authorized') {
    // the user is logged in to Facebook, 
    // but has not authenticated your app
  } else {
    // the user isn't logged in to Facebook.
  }
 });

Hope this Helps

Kaushik