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External Data Access

External Data Access. With jQuery and AJAX. Doncho Minkov. Telerik Corporation. www.telerik.com. Technical Trainer. Table of Contents. RESTful Web Services XML, JSON, RSS Consuming Our REST with jQuery Consuming Twitter REST with jQuery Twitter @Anywhere Twitter @Anywhere Features

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External Data Access

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  1. External Data Access With jQuery and AJAX Doncho Minkov Telerik Corporation www.telerik.com Technical Trainer

  2. Table of Contents • RESTful Web Services • XML, JSON, RSS • Consuming Our REST with jQuery • Consuming Twitter REST with jQuery • Twitter @Anywhere • Twitter @Anywhere Features • Facebook API

  3. RESTful Web Services Lightweight Architecture for Web Services

  4. What is REST? "Representational state transfer (REST) is a style of software architecture for distributed hypermedia systems such as the World Wide Web." http://en.wikipedia.org/wiki/Representational_State_Transfer • Application state and functionality are resources • Every resource has an URI • All resources share a uniform interface • This natively maps to the HTTP protocol

  5. RESTful Services • One URI for a resource, multiple operations • Add a new document "RestTalk" in category "Code" • PUT http://mysite.com/docs/Code/RestTalk • Get the document / some page • GET http://mysite.com/docs/Code/RestTalk • GET http://mysite.com/docs/Code/RestTalk/pages/3 • Remove the document • DELETE http://mysite.com/docs/Code/RestTalk • Retrieve metadata • HEAD http://mysite.com/docs/Code/RestTalk

  6. XML, JSON, RSS Comparing the Common Service Data Formats

  7. XML • XML is markup-language for encoding documents in machine-readable form • Text-based format • Consists of tags, attributes and content • Provide data and meta-data in the same time <?xml version="1.0"?> <library> <book><title>HTML 5</title><author>Bay Ivan</author></book> <book><title>WPF 4</title><author>Microsoft</author></book> <book><title>WCF 4</title><author>Kaka Mara</author></book> <book><title>UML 2.0</title><author>Bay Ali</author></book> </library>

  8. JSON • JSON (JavaScript Object Notation) • Standard for representing simple data structures and associative arrays • Lightweight text-based open standard • Derived from the JavaScriptlanguage { "firstName": "John", "lastName": "Smith", "age": 25, "address": { "streetAddress": "33 Alex. Malinov Blvd.", "city": "Sofia", "postalCode": "10021" }, "phoneNumber": [{ "type": "home", "number": "212 555-1234"}, { "type": "fax", "number": "646 555-4567" }] }, { "firstName": "Bay", "lastName": "Ivan", "age": 79 }

  9. RSS • RSS (Really Simple Syndication) • Family of Web feed formats for publishing frequently updated works • E.g. blog entries, news headlines, videos, etc. • Based on XML, with standardized XSD schema • RSS documents (feeds) are list of items • Each containing title, author, publish date, summarized text, and metadata • Atom protocol aimed to enhance / replace RSS

  10. RSS – Example <?xml version="1.0" encoding="utf-8" ?> <rss version="2.0"> <channel> <title>W3Schools Home Page</title> <link>http://www.w3schools.com</link> <description>Free web building tutorials</description> <item> <title>RSS Tutorial</title> <link>http://www.w3schools.com/rss</link> <description>New RSS tutorial on W3Schools</description> </item> <item> <title>XML Tutorial</title> <link>http://www.w3schools.com/xml</link> <description>New XML tutorial on W3Schools</description> </item> </channel> </rss>

  11. Consuming REST with jQuery How To Make It Work?

  12. Consuming REST With jQuery • Can be done with three methods • $.ajax(…) • $.get(…) • $.post(…) • $.get(…) and $.post(…) use $.ajax(…) under the hood • These methods load data from the server • Using rest service • Return JSON, Atom, RSS

  13. Example of $.ajax(…) The path of the REST Service (should be on the same server) $.ajax({ url: "RestService.svc/students/all", type: "GET", timeout: 5000, dataType: "json", success: function (students) { $('#loadStudentsButton').html("students loaded"); // do something with the students data // visualize them, etc… } error: function (err) { $('#loadStudentsButton').html("error: " + err.status); } }); Request type ('GET' or 'POST') The type of data to expect(JSON,XML) In case the request is successful In case the request is unsuccessful • Example of jQuery.ajax(…) get request

  14. Example of $.ajax(…) $.ajax({ url: "RestService.svc/students/new", type: "POST", timeout: 5000, contentType: "application/json", data: JSON.stringify(student), success: function () { $('#createStudentButton').html("student created"); //reload the students }, error: function (err) { $('#createStudentButton').html("error: " + err.status); } }); The type of data to sent to the server (JSON, XML) We have a student object (in JSON) and should make it readable for the server • Example of jQuery.ajax(…) post request

  15. Consuming Our REST with jQuery Live Demo

  16. Consuming Twitter REST with jQuery Lets Make Our Own Twitter?

  17. Twitter Rest API • First lets get familiar with the Twitter REST API • We are given a set of methods to • Get a number of tweets for a given user • Post a tweet using jQuery • Search tweets • Etc… • First need to register a twitter app

  18. Twitter Rest API (2) • Registering a Twitter App • Go to http://dev.twitter.com • Register a App • When your app is registered you get: • Consumer key • The key your app authorizes with • Consumer secret • Used for user authentication

  19. Methods of Twitter REST API • GET statuses/user_timeline • Returns the 20 most recent statuses posted by the authenticating user • It is also possible to request another user's timeline by using • The screen_nameor user_idparameter • The other users timeline will only be visible if they are not protected • If the authenticating user's follow request was

  20. Example of $.ajax(…) $.ajax({ url : https://twitter.com/statuses/user_timeline/"+ user+".json?callback=?" dataType: "json", timeout:5000, success : function(data) { //Visualize Tweets }, error : function() { //Visualize Errors }, }); • Getting Tweets from Twitter with jQuery

  21. Tweets Live Demo

  22. Twitter @Anywhere How To Make It Easy?

  23. Example of $.ajax(…) • What is Twitter @Anywhere? • An easy-to-deploy solution • Bringing the Twitter communication platform • Promotes a more engaged user base • Can be used to add • FollowButtons, Hovercards, linkifyTwitterusernames • Build integrations with "Connect to Twitter"

  24. How to Use @Anywhere? • With a registered App at dev.twitter.com • You get a AppId • In the head part of the app include • With anywhere.js included • A twttrobject and an anywherefunction • Used to make the magic with anywhere <script src="http://platform.twitter.com/anywhere.js?id=YOUR_APP_ID&v=1"></script>

  25. @Anywhere Example Live Demos

  26. Search Widget new TWTR.Widget({ version: 2, type: 'search', search: , interval: 300, title: 'It\'s a double rainbow', subject: 'Across the sky', width: 250, height: 300, theme: { shell: {background:'#70fd90',color: '#000000'}, tweets: {background: '#c6fec7', color: '#444444', links: '#1985b5'} }, features: { scrollbar: true, loop: true, live: true, behavior: 'default' } }).render().start();

  27. Tweets List Widget new TWTR.Widget({ version: 2, type: 'profile', search: , interval: 300, title: 'It\'s a double rainbow', subject: 'Across the sky', width: 250, height: 300, theme: { shell: {background:'#70fd90',color: '#000000'}, tweets: {background: '#c6fec7', color: '#444444', links: '#1985b5'} }, features: { scrollbar: true, loop: true, live: true, behavior: 'default' } }).render().start();

  28. Twitter Widgets Live Demo

  29. Twitter @Anywhere Features Login/Logout, Tweet, etc.

  30. Login – Logout twttr.anywhere(function (T) { T("#login").connectButton({ authComplete: function(user) { //something to do after authentication }, }); }); • Login: • Logout function logOut() { twttr.anywhere.signOut(); }

  31. Login/Logout Live Demo

  32. Features • Tweet Box twttr.anywhere(function (T) { T("#tbox").tweetBox(); }); • Follow Button twttr.anywhere(function (T) { T('#follow-donchominkov').followButton("donchominkov"); });

  33. Twitter @Anywhere Live Demo

  34. Facebook API Lets Play a Little with Facebook

  35. Facebook JavaScript SDK • Facebook provides a SDK for JavaScript • To use the functionality of Facebook • Should register an app • Through phone number • With credit card • Absolutely free • Made for precautions

  36. Facebook API Live Demo

  37. External Data Access

  38. Homework • Parse and add a html from an external source (like Google, Facebook, twitter, MySpace…) • Make a web app that has a textbox that can hold a text no longer than 140 symbols and a button. When the user clicks the button, the text should be tweeted in twitter and send as a feed to Facebook. • Implement a functionality for login/logout to both Twitter and Facebook.

  39. Homework (2) • Research the Rest API of one of the following: • Last.FM, MySpace, Google, Bing, Google +,Flickr, etc • Make a few demos to demonstrate the functionality.

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