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HTML 5

http://schoolacademy.telerik.com. HTML 5. New Tags, New Attributes, New JavaScript APIs, Forms, Validation, Audio, Video, SVG, Canvas. Doncho Minkov. Telerik Corporation. www.telerik.com. Table of Contents. Introduction to HTML 5 Changed Old Tags New Tags Audio and Video Tags

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HTML 5

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  1. http://schoolacademy.telerik.com HTML 5 New Tags, New Attributes, New JavaScript APIs, Forms, Validation, Audio, Video, SVG, Canvas Doncho Minkov Telerik Corporation www.telerik.com

  2. Table of Contents • Introduction to HTML 5 • Changed Old Tags • New Tags • Audio and Video Tags • New Structural Tags (<header>, <footer>, …) • New Form Elements • Forms Validation • New Attributes

  3. Table of Contents (2) • New CSS Styles • New JavaScript APIs • Working with SVG and Canvas

  4. Introduction to HTML 5 What the … is HTML 5?

  5. What is HTML 5? • HTML5 – the next major revision of the HTML • Currently under development • Far away from final version • Developed under the HTML 5 working group of the World Wide Web Consortium (W3C) in 2007 • First Public Working Draft of the specification • January 22, 2008 • Parts of HTML5 are being implemented in browsers before the whole specification is ready

  6. HTML – Past, Present, Future • 1991 – HTML first mentioned – Tim Berners-Lee – HTML tags • 1993 – HTML (first public version, published at IETF) • 1993 – HTML 2 draft • 1995 – HTML 2 – W3C • 1995 – HTML 3 draft • 1997 – HTML 3.2 – “Wilbur” • 1997 – HTML 4 – ”Cougar” – CSS • 1999 – HTML 4.01 (final) • 2000 – XHTML draft • 2001 – XHTML (final) • 2008 – HTML5 / XHTML5 draft • 2011 – feature complete HTML5 • 2022 – HTML5 – final specification

  7. HTML 5 Goals • Latest version is HTML5 • Aimed to have all of the power of native applications • Run on any platform (Windows, Linux, iPhone, Android, etc.) • New features should be based on HTML, CSS, DOM and JavaScript • Reduce the need for external plugins • Better error handling • More markup to replace scripting

  8. Designer Outlook What a Designer Should Know?

  9. Changed Old Tags • Doctype tag: • HTML tag: • Meta tag: • Link tag: <!DOCTYPE html> <html lang="en" xml:lang="en"> <meta charset="utf-8"> <link rel="stylesheet" href="style-original.css">

  10. New Layout Sctucture • Better layout structure: new structural elements • <section> • <header> • <nav> • <article> • <aside> • <footer> <header> <nav> <section> <aside> <header> <article> <footer> <footer>

  11. New Layout Sctucture (2) • Elements like header and footer are not meant to be only at the top and bottom of the page • Header and footer of each document section • Not very different from <DIV> tag but are more semantically well defined in the document structure

  12. New Layout Sctucture – Example <body> <header> <hgroup> <h1>HTML 5 Presentation</h1> <h2>New Layout Structure</h2>     </hgroup> </header> <nav>     <ul> Lecture     </ul> <ul> Demos     </ul> <ul> Trainers     </ul> </nav>

  13. New Layout Sctucture – Example (2) <section> <article> <header>         <h1>First Paragraph</h1>       </header> <section> Some text </section> </article> </section> <aside> <a href="http://academy.telerik.com"> more info</a> </aside> <footer> Done by Doncho Minkov, (c) 2011, Telerik Academy </footer> </body>

  14. New Layout Structure Tags Live Demo

  15. New Tags • <article> • For external content, like text from a news-article, blog, forum, or any other external source • <aside> • For content aside from (but related to) the content it is placed in • <details> • For describing details about a document, or parts of a document • <summary> • A caption, or summary, inside the details element

  16. New Tags (2) • <mark> • For text that should be highlighted • <nav> • For a section of navigation • <section> • For a section in a document (e.g. chapters, headers, footers) • <wbr> • Word break. For defining an appropriate place to break a long word or sentence • Other tags • <command>,<datalist>, <details>,<progress>, etc.

  17. New Media Tags • Media Tags • <audio> • Attributes: autoplay, controls, loop, src • <video> • Attributes: autoplay, controls, loop, height, width, src <audio width="360" height="240" controls= "controls" > <source src="someSong.mp3" type="audio/mp3"> </source> Audio tag is not supported </audio>

  18. Playing Audio Live Demo

  19. Embed Tag – New Syntax • <embed> • Defines embedded content, such as a plug-in • Attributes • src="url", type="type" <embed src="helloworld.swf" />

  20. New Attributes • New attributes

  21. New <input> Types • New <input>type(s)

  22. New Form Tags:<input type="range"> Live Demo

  23. Built-In Forms Validation Live Demo

  24. New JavaScript APIs What a programmer must know?

  25. JavaScript APIs • UI APIs • Canvas • Drag and Drop • Offline Applications • Local Storage • Extension to HTMLDocument

  26. Canvas • Canvas • Dynamic, Scriptable rendering of 2D images • Uses JavaScript to draw • Resolution-dependent bitmap • Can draw text as well <canvas id="ExampleCanvas" width="200" height="200"> This text is displayed if your browser does not support HTML5 Canvas. </canvas> var example = document.getElementById('ExampleCanvas'); var context = example.getContext('2d'); context.fillStyle = "rgb(255,0,0)"; context.fillRect(30, 30, 50, 50);

  27. Canvas Properties and Methods • fillStyle • Sets the drawing color • Default fillStyle is solid black • but you can set it to whatever you like • fillRect(x,y,width,height) • Draws a rectangle • Filled with the current fillStyle

  28. Canvas Properties and Methods (2) • strokeStyle • Sets the stroke color • strokeRect(x,y,width,height) • Draws an rectangle with the current strokeStyle • strokeRectdoesn’t fill in the middle • It just draws the edges • clearRect(x,y,width,height)clears the pixels in the specified rectangle

  29. Canvas Paths • What is a Path? • Something that is about to be drawn • It is not drawn yet context.beginPath(); context.moveTo(0, 40); context.lineTo(240, 40); context.moveTo(260, 40); context.lineTo(500, 40); context.moveTo(495, 35); context.lineTo(500, 40); context.lineTo(495, 45);

  30. Canvas Live Demo

  31. Drag and Drop • Drag and Drop • <element> attribute draggable="true" • Events: dragstart, dragstop

  32. Offline Applications • Offline Applications • Cache manifest file • Every page of your web application needs a manifest attribute • Points to the cache manifest for the entire application • Manifest file should contain Content-Type header (text/cache-manifest) • Forcible cache update • applicationCache.updated()

  33. Local Storage • Local Storage • Store data locally • Similar to cookies, but can store much larger amount of data • Same Origin Restrictions • localStorage.setItem(key, value) • localStorage.getItem(key) • SQL Storage • Easier access to SQL Storage

  34. HTML Storage • Local Storage openDatabase('documents', '1.0', 'Local document storage', 5*1024*1024, function (db) {db.changeVersion('', '1.0', function (t) { t.executeSql('CREATE TABLE docIds (id, name)'); }, error); }); function saveState(text){ localStorage["localStorageDemo"] = text; } function restoreState(){ return localStorage["localStorageDemo"]; } • SQL Web

  35. HTML DOM Extensions • HTML DOM Extensions: • getElementsByClassName() • innerHTML • hasFocus • getSelection()

  36. New CSS

  37. New CSS • New selectors (usable in JavaScript also) • Web Fonts • Text wrapping/overflow • Columns • Opacity, Gradients, Rounded Corners, Shadows • Transitions, Transforms, Animations

  38. End User Outlook What is the Advantage to the End User?

  39. HTML 5 – End User Outlook • Provides a very rich user experience without Plug-ins • RIA replacement? • Better Performance • Leverages GPU for better graphical experience

  40. How to Detect HTML5? • HTML5 is not a thing someone can detect • It consists of many elements that can be detected • <canvas>, <video>, etc. • The HTML5 specification defines how tags interact with JavaScript • Through the Document Object Model (DOM) • HTML5 doesn’t just define a <video>tag • There is also a corresponding DOM API for video objects in the DOM • You can use this API to detect support for different video formats, etc.

  41. HTML 5 – Showcases and Resources • HTML 5 Rocks – Examples, Demos, Tutorials • http://www.html5rocks.com/ • HTML 5 Demos • http://html5demos.com/ • Internet Explorer 9 Test Drive for HTML 5 • http://ie.microsoft.com/testdrive/ • Apple Safari HTML 5 Showcases • http://www.apple.com/html5/showcase/

  42. HTML 5 ? ? Questions? ? ? ? ? ? ? ? ? ?

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