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11. External Data Access - With jQuery and AJAX
 

11. External Data Access - With jQuery and AJAX

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Cross-Platform Mobile Development @ Telerik Academy...

Cross-Platform Mobile Development @ Telerik Academy
Telerik Software Academy: http://mobiledevcourse.telerik.com
The website and all video materials are in Bulgarian
Content:
RESTful Web Services
XML, JSON, RSS
Consuming REST with jQuery
Consuming Twitter REST with jQuery
Twitter @Anywhere
Twitter @Anywhere Features
Facebook API

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    11. External Data Access - With jQuery and AJAX 11. External Data Access - With jQuery and AJAX Presentation Transcript

    • External Data Access With jQuery and AJAXDoncho MinkovTechnical Trainerhttp://minkov.it/Telerik Software Academyhttp://academy.telerik.com
    • Table of Contents RESTful Web Services XML, JSON, RSS Consuming REST with jQuery Consuming Twitter REST with jQuery Twitter @Anywhere Twitter @Anywhere Features Facebook API
    • RESTful Web ServicesLightweight Architecture for Web Services
    • 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
    • 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 5
    • XML, JSON, RSSComparing the Common Service Data Formats
    • 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> 7
    • JSON JSON (JavaScript Object Notation)  Standard for representing simple data structures and associative arrays  Lightweight text-based open standard  Derived from the JavaScript language { "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 } 8
    • 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 9
    • 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> 10
    • Consuming REST with jQuery How To Make It Work?
    • 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
    • Example of $.ajax(…) The path of the REST Service (should be on the same server)$.ajax({ url: "RestService.svc/students/all", type: "GET", Request type (GET or POST) timeout: 5000, dataType: "json", The type of data to expect(JSON,XML) success: function (students) { $(#loadStudentsButton).html("students loaded"); // do something with the students data // visualize them, etc… In case the request is successful } error: function (err) { $(#loadStudentsButton).html("error: " + err.status); }}); In case the request is unsuccessful Example of jQuery.ajax(…) get request
    • Example of $.ajax(…)$.ajax({ url: "RestService.svc/students/new", The type of data to type: "POST", sent to the server (JSON, XML) timeout: 5000, contentType: "application/json", data: JSON.stringify(student), We have a student object (in JSON) and should make it readable for the server success: function () { $(#createStudentButton).html("student created"); //reload the students }, error: function (err) { $(#createStudentButton).html("error: " + err.status); }}); Example of jQuery.ajax(…) post request
    • Consuming Our REST with jQuery Live Demo
    • Consuming Twitter REST with jQuery Lets Make Our Own Twitter?
    • 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
    • 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
    • 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 users timeline by using  The screen_name or user_id parameter  The other users timeline will only be visible if they are not protected  If the authenticating users follow request was
    • 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
    • TweetsLive Demo
    • Twitter @Anywhere How To Make It Easy?
    • 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  Follow Buttons, Hovercards, linkify Twitter usernames  Build integrations with "Connect to Twitter"
    • How to Use @Anywhere? With a registered App at dev.twitter.com  You get a AppId In the head part of the app include <script src="http://platform.twitter.com/ anywhere.js?id=YOUR_APP_ID&v=1"></script> With anywhere.js included  A twttr object and an anywhere function  Used to make the magic with anywhere
    • @Anywhere Example Live Demos
    • Search Widgetnew TWTR.Widget({ version: 2, type: search, search: , interval: 300, title: Its 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();
    • Tweets List Widgetnew TWTR.Widget({ version: 2, type: profile, search: , interval: 300, title: Its 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();
    • Twitter Widgets Live Demo
    • Twitter @Anywhere Features Login/Logout, Tweet, etc.
    • Login – Logout Login: twttr.anywhere(function (T) { T("#login").connectButton({ authComplete: function(user) { //something to do after authentication }, }); }); Logout function logOut() { twttr.anywhere.signOut(); }
    • Login/Logout Live Demo
    • Features Tweet Box twttr.anywhere(function (T) { T("#tbox").tweetBox(); }); Follow Button twttr.anywhere(function (T) { T(#follow-donchominkov).followButton("donchominkov"); });
    • Twitter @Anywhere Live Demo
    • Facebook APILets Play a Little with Facebook
    • 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
    • Facebook API Live Demo
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    • Free Trainings @ Telerik Academy Cross-Platform Mobile Development http://mobiledevcourse.telerik.com Telerik Software Academy  academy.telerik.com Telerik Academy @ Facebook  facebook.com/TelerikAcademy Telerik Software Academy Forums  forums.academy.telerik.com