function statusChangeCallback(response) {
    console.log('statusChangeCallback');
    console.log(response);

      if(response.status === 'connected') {
        fbAccessToken = response.authResponse;
        testAPI();
      }
      else if (response.status === 'not_authorized') {

        console.log('not authorised');
      }
      else {

        console.log('not logged in');
      }

  }

  function checkLoginState() {

      FB.getLoginStatus(function(response) {
        statusChangeCallback(response);
        //- var uid = response.authResponse.userID;
        //- var accessToken = response.authResponse.accessToken;
        //- console.log(uid, accessToken);
      });

  }

  window.fbAsyncInit = function() {
    FB.init({
      appId      : 'APPID',

      cookie     : true,  // enable cookies to allow the server to access
                          // the session
      xfbml      : true,  // parse social plugins on this page
      version    : 'v2.5' // use version 2.2
    });



  };

  // Load the SDK asynchronously
  (function(d, s, id) {
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) return;
    js = d.createElement(s); js.id = id;
    js.src = "//connect.facebook.net/en_US/sdk.js";
    fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));

  // Here we run a very simple test of the Graph API after login is
  // successful.  See statusChangeCallback() for when this call is made.
  function testAPI() {
    $('.login-using-fb').hide();
    $('.entr-mobile-nmbr ').show();
    $('.mobile-verification').slideDown(300);
      //- $thisParent.next().slideDown(300);

    $('.prsnl-submit-button, .loggedin-usr, .loggedin-usr-dtl').show();
    console.log('Welcome!  Fetching your information.... ');
    FB.api('/me', function(response) {
      console.log(response);
      console.log('Successful login for: ' + response.name);
    });
  }

fb:login-button(onlogin="checkLoginState();") Connect with Facebook