Introduction to Facebook Javascript SDK

APIIntroduction to Facebook Javascript APISocial Network and Applications, 2011LittleQ, The department of Computer Science, NCCU f Introduction to Facebook JS API

Objectives• Learn the concepts of Facebook API• Learn how to use Facebook API with Javascript f Introduction to Facebook JS API

Core Topics• Facebook Developers website• Graph API• Facebook Javascript SDK• Resources f Introduction to Facebook JS API

Facebook Developers• Provide you online documentations• Forum for discussion• Management of your applications f Introduction to Facebook JS API

Where is it? f Introduction to Facebook JS API

Social Plugins• Like Button, Send Button, Login Button• Comments• Registration• Activity Feed, Live Stream f Introduction to Facebook JS API

Graph API Response Data Aggregate Information Access Token Request DataApplication Graph API Facebook Database • Facebook’s core • Social graph • Connections f Introduction to Facebook JS API

Graph Model• Composed of objects and connections• Identify entities and relationships by id• Data will be stored with smallest spaces and keep being updated f Introduction to Facebook JS API

Object Modelinformation from graph API without access token f Introduction to Facebook JS API

Graph Model information from graph API with access token f Introduction to Facebook JS API

Connection Model• All of the object in the Facebook social graph are connected to each other via connections• Objects are just like entities while connections are like relationship• For example, users, pages and groups are objects and likes, friends and feeds are connections f Introduction to Facebook JS API

Connection Model f Introduction to Facebook JS API

Access to Graph• HTTP(S) Graph API• SDKs ‣ Javascript SDK ‣ iOS SDK ‣ Android SDK ‣ PHP SDK ‣ Python SDK f Introduction to Facebook JS API

HTTP(S) Graph API• RESTful HTTP request & response• Response data-type: JSON• Access URL: graph.facebook.com f Introduction to Facebook JS API

HTTP(S) Graph APIhttp://graph.facebook.com/<id-‐or-‐username>• Request information of an object with id or username• id-or-username can be “me” with the access token f Introduction to Facebook JS API

HTTP(S) Graph API http://graph.facebook.com/littleq0903Result: { "id": "1681390745", "name": "u8607u82d1u9716", //翻譯：蘇苑霖 "first_name": "u82d1u9716", //翻譯：苑霖 "last_name": "u8607", //翻譯：蘇 "link": "https://www.facebook.com/littleq0903", "username": "littleq0903", "gender": "male", "locale": "en_US" } f Introduction to Facebook JS API

HTTP(S) Graph API• Access token should be transferred as a HTTP GET variablehttp://graph.facebook.com/littleq0903?access_token=...• More information: developers.facebook.com/docs/ reference/api/ f Introduction to Facebook JS API

Access Token• A long string to denote the authentication of users, which request facebook information with your application• The information behind the access token ‣ user id ‣ app id ‣ expired time ‣ secret f Introduction to Facebook JS API

Javascript SDK• Let you access all features of the Graph API or dialogs via Javascript• Authentication• Rendering the XFBML versions of Social Plugins• Most functions in the FB Javascript SDK require an app id f Introduction to Facebook JS API

Load the Script• You must specify a <div> element with id “fb-root” in your web pages <div id=”fb-‐root”></div>• The location of the script http://connect.facebook.net/ /all.js en_US zh_TW f Introduction to Facebook JS API

Initialization FB.init({ appId : YOUR APP ID, status : true, // check login status cookie : true, // enable cookies xfbml : true // parse XFBML });• Do this after the “fb-root” div element has been built f Introduction to Facebook JS API

Components• Core Methods• Event Handling• XFBML Methods• Data Access Utilities• Canvas Methods f Introduction to Facebook JS API

Core Methods• FB.api(): Access the Graph API• FB.getLoginStatus()• FB.getSession()• FB.init(): Method of initialization• FB.login(): Login method• FB.logout(): Logout method• FB.ui(): Method to call dialogs f Introduction to Facebook JS API

FB.api()• make a API call to the Graph API• depending on the connect status and the permissions Call if success. function SuccessCall(res){ alert(res.name); } FB.api(/me, SuccessCall); f Introduction to Facebook JS API

FB.ui()FB.ui( { method: feed, name: Facebook Dialogs, link: https://developers.facebook.com/docs/reference/dialogs/, picture: http://fbrell.com/f8.jpg, caption: Reference Documentation, description: Dialogs provide a simple, consistent interface for applications to interface with users., message: Facebook Dialogs are easy! } ); • Triggering iframe dialogs or popups with Facebook f Introduction to Facebook JS API

More Topics• Event Handling• XFBML• FQL• Other SDKs for Facebook Graph API f Introduction to Facebook JS API

Tools• Javascript Console• Debug version of Facebook JS SDK• Test users• URL Linter f Introduction to Facebook JS API

Examples• js_ex1.html - Social Plugins• js_ex2.html - FB.api()• js_ex3.html - FB.api()• js_ex4.html - FB.ui() & Dialogs• Download URL: http://goo.gl/3YnnK f Introduction to Facebook JS API

Temporary HTTP Server • python -‐m SimpleHTTPServer • http://127.0.0.1:8000/ • Facebook app allow only one domain access at a time f Introduction to Facebook JS API

Resources[1] Facebook Developers[2] jQuery - http://jquery.com[3] Javascript tutorial - http://www.study-area.org/coobila/category_Javascript_u6559_u5B78.html[4] Google - http://www.google.com f Introduction to Facebook JS API

Q&A TimeThanks for your listening f Introduction to Facebook JS API

Introduction to Facebook Javascript SDK

by Colin Su on May 07, 2011

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