1. Maurice de Beijer

2. Who am I Maurice de Beijer The Problem Solver Microsoft Integration MVP DevelopMentor instructor Twitter: @mauricedb Blog:http://msmvps.com/blogs/theproblemsolver/ Web: http://www.HTML5Support.nl E-mail:mauricedb@computer.org 3. What we arent going to cover But I would really like to! Asynchronous Module Definition/RequireJS TypeScript CSS3 LESS/SASS Tooling But I will in my Modern Web Development session at the TechDays 4. What are we going to cover Polyfills Semantic elements Databinding & templates WebSockets Drag/Drop Graphics Storing data in the browser 5. The demo application Multiple concurent users Business rules that need to be enforced Use charts for reporting Support multiple devices Desktop Tablet with touch Support old versions of Internet Explorer 10 to 20% of users use Internet Explorer 8http://bit.ly/DotNed 6. Polyfills Not every browser supports every HTML5 feature Especially true with old browsers Many missing features can be added using a polyfill Offers the standard API Often done in JavaScript JavaScript is slow in older browsers A few good lists to check Modernizr HTML5 Cross Browser Polyfills HTML5 please 7. HTML5 Semantic elements New HTML5 elements 8. HTML5 Semantic elements How about support? 9. HTML5 Semantic elements Why use them? Searchability Accessibility Neither really makes sense Search engines dont really care Use WAI-ARIA for accessibility support Make sure to add support in older versions of IE Modernizr Html5Shiv 10. HTML5 Semantic elements 11. Databinding & templates Construct HTML snippets using JavaScript or jQuery Is tedious as best Use a richer application library Backbone Knockout Ember ... Choosing one is a matter of taste Checkout TodoMVC for a comparison with a to do app My choice is Knockout 12. Databinding & templates 13. WebSockets A bi-directional socket connection Between a web browser and the web server The server can push updates to the browser Refreshing the browser to see updates is so 2012 Not just for games and chat applications Any application where you want fast updates Decrease the chance of concurrency issues 14. WebSockets How about support? 15. WebSockets Suffers from lack of infrastructure support Routers and firewalls can cause issues The API is low level Messages are just simple objects You might need to retransmit missed messages Use ASP.NET SignalR Uses WebSockets if possible Otherwise it uses fallbacks like Comet Supports scale out scenarios Uses a very simple API 16. WebSockets 17. Drag and Drop Drag and drop can be a very intuitive user interaction Often seen as more fun by users Very common interaction on tablets But works equally well with a mouse HTML5 supports drag and drop Including dragging from the file system 18. Drag and DropHow about support? 19. Drag and Drop Use jQuery UI instead of the HTML5 capabilities Use jQuery UI Touch Punch for touch support Add -ms-touch-action: none in CSS for Windows 8 20. Drag and Drop 21. Graphics Rich graphics are common in modern applications Interactive graphics Charts Often generated on the client Not just images downloaded from the server Two basic options Scalable Vector Graphics Canvas 22. Comparison of Canvas and SVGCanvasSVGPixel-based (canvas is essentially an image Object Model-based (SVG elements areelement with a drawing API) similar to HTML elements)Single HTML element similar to in Multiple graphical elements which becomebehaviorpart of the Document Object Model (DOM)Visual presentation created with markup andVisual presentation created and modifiedmodified by CSS or programmatically throughprogrammatically through scriptscriptEvent model/user interaction is coarseatEvent model/user interaction is object-basedthe canvas element only; interactions must beat the level of primitive graphic elementsmanually programmed from mouselines, rectangles, pathscoordinatesAPI does not support accessibility; markup- SVG markup and object model directlybased techniques must be used in addition to supports accessibilitycanvas 23. SVG How about support? 24. Canvas How about support? 25. Graphics Use a library to make the API easier Dont worry about Canvas versus SVG jqPlot is great for charts It uses canvas Includes exCanvas for IE 7/8 support Raphal is a great choice for general graphics It uses SVG Uses VML for IE 7/8 support 26. Graphics 27. Storing data in the browser Lots of data changes only infrequently Dont waste time by loading it every time HTTP caching can help But is less flexible HTML5 has two mechanisms for local storage LocalStorage is a simple dictionary IndexedDB is a document database Web SQL is also an option but has been deprecated 28. IndexedDB How about support? 29. LocalStorage How about support? 30. Web SQL Database How about support? 31. Storing data in the browser LocalStorage is well supported Except in very old versions of IE IndexedDB is much more powerful But the API is hard to use Lawnchair is easy to use Abstracts the underlying data storage Can use LocalStorage, IndexedDB or other storage db.js makes IndexedDB easy to use But requires a polyfill in old browsers 32. Storing data in the browser 33. Conclusion There is lots of goodness in HTML5 But not everything is as useful Some of the APIs are hard to use But there are good libraries to make things easier Think about support with older browsers Use polyfills where needed Download the demo code