// Facebook Setup

window.fbAsyncInit = function() {

  FB.init({

    appId      : 'app_id_here',

    xfbml      : true,

    version    : 'v2.0'

  });

};

​

// Facebook JavaScript

(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'));

​

// jQuery Functions

$(document).ready( function() {

​

  // on click function for Facebook login button

  $('.fb-login button').on( 'click', function( e ) {

​

    // remove previously checked values

    // this is only required if you are using radio buttons or checkboxes

    $('[name="Field105"]').removeAttr('checked');

​

    // Trigger login to Facebook, asks for 'email' permissions

    FB.login(function(){

      // on login, get the user's details

      FB.api('/me', 'get', {}, function (response ) {

        // debug

        console.log(response);

​

        // add the user's details to the form

        // form names must match your HTML code

        $('[name="Field1"]').val( response.first_name );

        $('[name="Field2"]').val( response.last_name );

        $('[name="Field3"]').val( response.email );

​

        // check the correct gender box

        if ( response.gender == 'male' ) {

          $('#Field105_1').attr('checked', 'checked').trigger('click');

        } else if ( response.gender == 'female' ) {

          $('#Field105_2').attr('checked', 'checked').trigger('click');

        } else {

          $('#Field105_0').attr('checked', 'checked').trigger('click');

        }

​

        // submit the form

        $('#form1').submit();

​

      });

    }, {scope: 'email'});

​

  });

});