jrobinsonc
10/28/2013 - 2:43 PM

The easiest way to get connected on facebook.

The easiest way to get connected on facebook.

fb_login.js
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 /**
 * FB Login
 *
 * @author JoseRobinson.com
 * @link GitHup: https://gist.github.com/jrobinsonc/7197898
 * @version 201310291828
 */
 var FB_login = (function (required_permissions, success_callback, fail_callback) {

    function login () {

        FB.login(function(response) {

            if (response.status === 'connected') {
                check_permissions(function() {
                    fail_callback();
                });
            } else {
                fail_callback();
            }

        }, {
            scope: required_permissions
        });
    }

    function check_permissions (check_callback) {

        FB.getLoginStatus(function(response) {

            if (response.status === 'connected') {
                
                FB.api('/' + response.authResponse.userID + '/permissions', function(user_permissions) {

                    var required_permissions_array = required_permissions.split(',');

                    for (var key in required_permissions_array) {
                        if ((required_permissions_array[key] in user_permissions.data[0]) === false || user_permissions.data[0][required_permissions_array[key]] !== 1) {

                            check_callback();
                            return;
                        }
                    }

                    FB.api('/' + response.authResponse.userID, function(response) {
                        success_callback(response);
                    });
                });

            } else {
                check_callback();
            }
        });
    }

    check_permissions(function(){
        login();
    });
});
README.md
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  • Rendered
  • Source

FB Login

Documentation

For use this script you have to complete the followign 2 steps: (1) Create a Facebook app and (2) Add the Facebook SDK for JavaScript, that are described in the followin guide: Getting Started with Facebook Login for Web.

Then, you must include the fb_login.js file and call the function FB_login() with the following 3 params:

  1. permissions: The permisssions that you want to get from the user's facebook account.
  2. callback_success: The function to execute if the permissions are granted by the user. This function receive one param, the user's info.
  3. callback_fail: The function to execute if the permissions are not granted.

Usage

Example usage:


// Get the basic info, email, birthday and get permissions to publish on the user's wall.
FB_login('basic_info,user_birthday,email,publish_actions', function(user) {

    // Publish on the user's wall.
    FB.api(
       'me/links',
       'post',
        { 
            link: 'http://joserobinson.com/'
        },
        function(response) {}
    );
    

}, function() {
    alert("You must accept the request.");
});

Credits

Jose Robinson
www.joserobinson.com

And...

If you get and error or if there are something missing please do a comment.