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HTML5 on Mobile

  1. 1. HTML5 on Mobile Adam Lu Frontend Engineer
  2. 2. Previous Slides • HTML5 on Mobile – For Designer mobilefor-designer • HTML5 on Mobile – For Developer mobilefor-developer
  3. 3. Today’s Topic • Why we’re focusing on mobile web • Why we’re using HTML5 on mobile • What is HTML5 • What we can use HTML5 to do on mobile(Large Coverage) • What we should care about for mobile web development • Miscellaneous
  4. 4. Why we’re focusing on mobile web
  5. 5. Mobile is Growing • In January 2012, 8.49 percent of website hits/pageviews come from a handheld mobile device (StatCounter) • Mobile will be bigger than desktop internet in 5 years (Morgan Stanley) • 2.1 billion mobile devices will have HTML5 browsers by 2016 up from 109 million in 2010 (ABI Research)
  6. 6. Mobile is Growing Source: Nielsen (January 2012)
  7. 7. Mobile Users prefer browsers over apps (source: Adobe)
  8. 8. Web App vs Native App Web App Native App Comparation Just enter the URL Must be deployed or Installation/updates downloaded Access to web analytics. Apple Store, Android Monetization Rate,SaaS based revenue Market, Rating Progressive Enhancement Follow the standards End User Experience GeoLocation, Offline camera, gyroscope, Access to hardware sensors Storage, Canvas Graphics, microphone, compass, Audio, Video, accelerometer, GPS Camera(Android3.1+) HTML5, CSS3, Javascript, UI Object-C, Java, C++, J2EE, Developer Experience Library .NET, Cocoa Touch Web Workers, Graphic Run directly on the metal, Performance acceleration, WebGL GPU Acceleration, Multi- Threading
  9. 9. Why we’re using HTML5 on mobile
  10. 10. HTML5 is Great for Mobile • Do not need download to use Web App • One Code base, all popular devices • Tons of great HTML5 features are already supported on modern browsers
  11. 11. What is HTML5
  12. 12. Rough Timeline of Web Technologies • 1991 HTML • 1994 HTML 2 • 1996 CSS 1 + JavaScript • 1997 HTML 4 • 1998 CSS 2 • 2000 XHTML 1 • 2002 Tableless Web Design • 2005 AJAX • 2009 HTML 5
  13. 13. HTML5Logo
  14. 14. The Technology Forms, Communication, Canvas, Geolocation, W eb Applications, Audio, WebGL, Microdata, Video, Workers, Files, Elements, Storage, Local Devices, User interaction, Parsing rules, …
  15. 15. What we can use HTML5 to do on mobile
  16. 16.
  17. 17. HTML5 has been widely used on pc web development • • • • …… * We will not talk more about HTML5 on PC Web.
  19. 19. HTML Markup <!DOCTYPE html> Semantic HTML: <html> <section> <head> <article> <meta charset="utf-8" /> <nav> <meta name="viewport" <aside> content="width=device-width, initial- <header> scale=1, maximum-scale=1, user-scalable=no"> <progress> <link rel="apple-touch-icon" <time> href="images/favicon.png" /> … </head> Basic Setting: <body> Set Viewport </body> Turn off user-scaling </html> Set favicon …
  20. 20. Advanced Forms in Mobile <input type="number" pattern="[0-9]*" /> <input type="email” required /> <input type="url" /> <input type="tel" /> <input type="time" /> <input type="date" /> <input type="month" /> <input type="week" /> <input type="datetime" /> <input type="datetime-local" /> <input type="color" /> rc.1/docs/forms/textinputs/
  21. 21. Microdata, ARIA attributes <div <ul id="tree1" itemscopeitemtype="http://example. role="tree" org/band"> tabindex="0" <p>My name is <span aria-labelledby="label_1"> itemprop="name">Neil</span>.</p> <li role="treeitem" tabindex="-1" aria- <p>My band is called <span expanded="true">Fruits</li> itemprop="band">Four Parts <li role="group"> Water</span>.</p> <ul> <p>I am <span <lirole="treeitem" tabindex="- itemprop="nationality">British</span 1">Oranges</li> >.</p> <li role="treeitem" tabindex="- </div> 1">Pineapples</li> ... </ul> </li> </ul>
  23. 23. Offline Web Application Cache • Method of defining web page files to be cached using a cache manifest file, allowing them to work offline on subsequent visits to the page <html window.applicationCache.addEventListen manifest="/cache.manifest”> er('updateready', function(e) { CACHE MANIFEST if (window.applicationCache.status == # version 1.0.0 window.applicationCache.UPDATEREADY{ NETWORK: * window.applicationCache.swapCach(); CACHE: window.location.reload(); /js/* /image/* }}, false); FALLBACK:
  24. 24. Local Storage, Session Storage • Web storage and DOM storage (document object model) are web application software methods and protocols used for storing data in a web browser. varfoo = localStorage.getItem(“bar”); localStorage.setItem(“bar”, “foo”); localStorage.clear(); sessionStorage.setItem(‘a’, ‘1’); sessionStorage.removeItem(‘a’); window.addEventListener(“storage”, ha ndle_storage, false);
  26. 26. Geolocation • Method of informing a website of the user's geographical location navigator.geolocation.getCurrentPosition(succe ss, failure, options); PERMISSION_DE NIED (1) POSITION_UNAV AILABLE (2) TIMEOUT (3) UNKNOWN_ERR OR (0)
  27. 27. Javascript Events window.addEventListener("touchstart", function(e){ //e.touches; }, false); window.addEventListener("orientationchange", function(e){ //window.orientation(0 is portrait, 90 and -90 are landscape) }, false); window.addEventListener("deviceorientation", function(e){ //e.alpha //e.beta //e.gamma }, false); window.addEventListener("devicemotion", function(e){ //e.acceleration.x/y/z //e.accelerationIncludingGravity.x/y/z }, false);
  28. 28. Device Support window.devicePixelRatio HTML Media Capture: <input type="file" accept="image/*" navigator.connection(Android2.2+) capture="camera" /> //navigator.connection object <device type="media"></device> { "type": "3", <video autoplay></video> "UNKNOWN": "0", navigator.getUserMedia({video: "ETHERNET": "1", true, audio: true}, function(stream) { "WIFI": "2", var video = "CELL_2G": "3", document.querySelector('video'); "CELL_3G": "4" video.src = stream; } }, errorCallback);
  30. 30. Web Sockets • W3C/IETF Standard • Real-time, low latency, true full-duplex communication channel • Build on top of HTTP, sharing ports with existing HTTP content, use ws: and wss: schemes • Only small overhead for text messages, reducing bandwidth conn = new WebSocket('ws://'); conn.onopen= function (envent) {conn.send(‘hello’);}; conn.onmessage= function (event) {}; conn.onclose= function (event) {};
  31. 31. Server-Sent Events • Open an HTTP connection for receiving push notifications from a server in the form of DOM events. • Standardize sending a continuous stream of data from server to browser • The API is designed such that it can be extended to work with other push notification schemes such as Push SMS. Client: Server: var source = new EventSource("url"); res.writeHead(200, {"Content‐Type": source.onmessage = function(event) { "text/event‐stream"}); alert(; res.write(“data: ” + JSON.stringify(stuff) } +”n”);res.flush();
  32. 32. XMLHttpRequest Level 2 • XMLHttpRequest(XHR) Level2 significantly enhances XMLHttpRequest Fetch Data: Send Data: varxhr = new XMLHttpRequest(); function uploadFiles(url, files) {'GET', '/path/to/image.png', true); varformData = new FormData(); xhr.responseType = 'blob'; for (vari = 0, file; file = files[i]; ++i) { xhr.onload = function(e) { formData.append(, file);} if (this.status == 200) { varxhr = new XMLHttpRequest(); var blob = this.response;'POST', url, true); varimg = document.createElement('img'); xhr.send(formData); } img.src = document.querySelector('input[type="file" window.URL.createObjectURL(blob); ]').addEventListener('change', function(e) { document.body.appendChild(img); uploadFiles('/server', this.files); } }, false); }; xhr.send();
  33. 33. Cross-document messaging • Enables secure cross-origin communication across iframes, tabs and windows • Uses Origin security window.addEventListner("message", message Handler, true); function messageHandler(e){ if(e.origin== ''){ processMessage(; } //ignore message if origin not recognized }
  34. 34. Cross-Origin Resource Sharing • Defines a mechanism to enable client-side cross- origin requests. Specifications that enable an API to make cross-origin requests to resources can use the algorithms defined by this specification. If such an API is used on resources, a resource on http://hello- world.examplecan opt in using the mechanism described by this specification (e.g., specifying Access-Control-Allow-Origin: as response header), which would allow that resource to be fetched cross-origin from
  35. 35. MULTIMEDIA
  36. 36. Video <video id=“video” poster=”poster.jpg" src=”source.mp4" width="2" height="1" x-webkit- airplay="allow” autoplay controls></video> AddType video/ogg .ogv AddType video/mp4 .mp4 AddType video/webm .webm document.getElementById(‘video’) .play();
  37. 37. Audio <audio id=“audio” controls preload="auto" autobuffer> <source src="elvis.mp3" /> <source src="elvis.ogg" /> </audio> var audio = document.getElementById(‘audio’);; audio.pause(); audio.volume+=0.1; audio.currentTime = 122; More: WEB AUDIO API
  39. 39. Canvas • 2D drawing platform within the browser • Use nothing more than JavaScript and HTML – no plugins • Extensible through a JavaScript API <canvas id="a" width="300" height="225"></canvas> vara_canvas = document.getElementById("a"); vara_context = a_canvas.getContext("2d"); a_context.lineWidth = 5; a_context.strokeStyle = ‘rgba(244, 34, 23, .8)’; a_context.fillRect(50, 25, 150, 100); a_context.stroke();
  40. 40. WebGL • Javascript Binding for OpenGL ES 2.0 on Browser • Run as a specific context for the HTML <canvas> element, which gives you access to hardware-accelerated 3D rendering in JavaScript. • Allow developers to put real-time interactive 3D graphics in the browser. a lightweight 3D engine
  41. 41. SVG • Method of displaying basic Vector Graphics features using the embed or object elements * SVG isn’t part of HTML5
  43. 43. Web Workers • Scripts running in background • Heavy Weight Scripts var worker = new Worker('doWork.js'); doWorker.js worker.addEventListener('message', functi on(e) { self.addEventListner(‘message’, functio console.log('Worker said: ',; n(e){ }, false); self.postMessage(’ Worker worker.postMessage('Hello World'); // says: Hello’); Send data to our worker worker.onerror= function(e){} }, worker.terminate(); false);
  44. 44. History API • The DOM window object provides access to the browser's history through the history object. It exposes useful methods and properties that let you move back and forth through the user's history window.history.pushState(data, title, url);//Add one history state into browser history and update the URL in the browser window. window.history.replaceState(state, title, url);//Modify the current history entry instead of creating a new one. window.onpopstate = function(e){e.state;};//A popstate event is dispatched to the window every time the active history entry changes.
  45. 45. CSS3 STYLING
  46. 46. CSS3 New Features • Border Radius • Shadows • Gradient • Color • Background • Border Image • Font • Transform • Transition • Animation DEMO:
  47. 47. CSS on Mobile -webkit-text-size-adjust: none; -webkit-user-select: none; -webkit-touch-callout; -webkit-tap-highlight-color: transparent; position: fixed; audio, canvas, video { display: inline- block;} article, aside, details, figcaption, figure, f ooter, header, hgroup, nav, section { display: block; } input[type="search"]{ -webkit- appearance: none/textfield;}
  48. 48. What we should care about for mobile web development
  49. 49. Mobile-First Responsive Design • Responsive Web design is the approach that suggests that design and development should respond to the user’s behavior and environment based on screen size, platform and orientation.
  50. 50. Choose a Framework • Boilerplate • Packaging frameworks   • Web application frameworks      • HTML5 Game frameworks   
  51. 51. Mobile Debugging Tools • Debugging  WEINRE  WebKit Remote Debugging • Emulators & Simulators  Mobile Emulators and Simulators  Android Emulator  iOS Simulator • Performance  Mobile PerfBookmarklet 
  52. 52. Miscellaneous
  53. 53. Make Mobile Web Applications
  54. 54. Make Mobile Web Application Full screen mode: <meta name="apple-mobile-web-app-capable" content="yes" /> Native Look: text-shadow box-shadow multi backgrounds border-image border-radius rgba color gradient transform transition Mobile Behavior: position: fixed; overflow: scroll; touch/gesture/orientationchange event Offline: AppCache LocalStorage
  55. 55.
  56. 56. Usage of HTML5 in Mobile Web
  57. 57. Usage of HTML5 in Mobile Web
  58. 58. Usage of HTML5 in Mobile Web
  59. 59. Usage of HTML5 in Mobile Web
  60. 60. Mobile Design Patterns
  61. 61. Compatibility • • • • • • • • •
  62. 62. Inspiration • - Mobile UI Patterns • Another gallery of Mobile UI • the best in mobile web design and developer news.
  63. 63. Resources • • • • • •
  64. 64. HTML5 is the future of Mobile!
  65. 65. @adamlu

Notas del editor

  • Develop in HTML5 for mobile devices namely deploy roughly the same code based on all HTML5-ready phones
  • Giving meaning to structure, semantics are front and center with HTML5. A richer set of tags, along with RDFa, microdata, and microformats, are enabling a more useful, data driven web for both programs and your users.
  • Web Apps can start faster and work even if there is no internet connection, thanks to the HTML5 App Cache, as well as the Local Storage, Indexed DB, and the File API specifications.
  • Beginning with the Geolocation API, Web Applications can present rich, device-aware features and experiences. Incredible device access innovations are being developed and implemented, from audio/video input access to microphones and cameras, to local data such as contacts &amp; events, and even tilt orientation.
  • More efficient connectivity means more real-time chats, faster games, and better communication. Web Sockets and Server-Sent Events are pushing (pun intended) data between client and server more efficiently than ever before.
  • Audio and video are first class citizens in the HTML5 web, living in harmony with your apps and sites. Lights, camera, action!
  • Between SVG, Canvas, WebGL, and CSS3 3D features, you&apos;re sure to amaze your users with stunning visuals natively rendered in the browser.
  • Make your Web Apps and dynamic web content faster with a variety of techniques and technologies such as Web Workers and XMLHttpRequest 2. No user should ever wait on your watch.
  • CSS3 delivers a wide range of stylization and effects, enhancing the web app without sacrificing your semantic structure or performance. Additionally Web Open Font Format (WOFF) provides typographic flexibility and control far beyond anything the web has offered before.