Web on TV - the joy and (mostly) pain of TV development / jQuery Europe / Vienna 23.02.2013
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Web on TV - the joy and (mostly) pain of TV development / jQuery Europe / Vienna 23.02.2013 Presentation Transcript

  • 1. Web on TVTHE JOY AND (MOSTLY) PAIN OF TV DEVELOPMENTPatrick H. Lauke / jQuery Europe / Vienna / 23 February 2013
  • 2. “web” on TV is nothing new
  • 3. CE-HTMLXHTML 1.0, CSS 2.1, DOM Level 2, Ajax, special APIs for TV hbbtv.org
  • 4. “Smart” TV = runs apps (optionally, has a web browser)
  • 5. Apps● native apps (Android, Apple TV, ...)● packaged web apps (W3C widgets or similar)● “in the cloud” (theyre URLs)
  • 6. developing for TV
  • 7. 1. display size2. input mechanisms3. features/performance
  • 8. 1. display size2. input mechanisms3. features/performance
  • 9. 720×576 960×5401280×7201920×1080
  • 10. CSS 2 Media Types?
  • 11. Media typesall brailleembossed handheldprint projectionscreen speechtty tv
  • 12. <!-- mobile/tablet viewport sanity --><meta name=”viewport” content=”width=device-width”><!-- but TVs dont support viewport -->
  • 13. old-school browser sniffing http://www.flickr.com/photos/timdorr/2096272747/
  • 14. /* Still make it responsive/adaptive *//* Full HD */@media screen and (min-width: 1920px) { … }/* HD-Ready */@media screen and (min-width: 1280px) and (max-width: 1920px) { … }/* Smaller */@media screen and (max-width: 1280px) { … }
  • 15. ● large text and images● large UI elements for interaction● minimise scrolling
  • 16. 1. display size2. input mechanisms3. features/performance
  • 17. ● mouse pointer (“magic” remotes)● spatial navigation (Opera only?)● D-pad key events
  • 18. ● not very precise (giant mouse pointer)● scrolling can be an issue
  • 19. Opera-specific: spatial navigation Shift + cursor keysfocusable elements and elements with mouseover / click
  • 20. dont lose your focusa:focus, button:focus { … }
  • 21. blah.addEventListener("keydown", function(e) { … switch (e.keyCode) { case 37: // left break; case 38: // up break; case 39: // right break; … }}, useCapture);// Fun fact: key codes can vary between devices!
  • 22. blah.addEventListener("keydown", function(e) { … e.preventDefault(); // prevent Operas spatnav}, useCapture);
  • 23. var VK_ENTER = 13; var VK_RED = 403;var VK_PAUSE = 19; var VK_GREEN = 404;var VK_PAGE_UP = 33; var VK_YELLOW = 405;var VK_PAGE_DOWN = 34; var VK_BLUE = 406;var VK_LEFT = 37; var VK_REWIND = 412;var VK_UP = 38; var VK_STOP = 413;var VK_RIGHT = 39; var VK_PLAY = 415;var VK_DOWN = 40; var VK_FAST_FWD = 417;var VK_0 = 48; var VK_INFO = 457;var VK_1 = 49; var VK_BACK = 461;var VK_2 = 50;var VK_3 = 51;var VK_4 = 52;var VK_5 = 53;var VK_6 = 54;var VK_7 = 55;var VK_8 = 56;var VK_9 = 57;
  • 24. // abstracted VK_ globals … better?blah.addEventListener("keydown", function(e) { … switch (e.keyCode) { case VK_LEFT: // left break; case VK_UP: // up break; case VK_RIGHT: // right break; … }}, useCapture);
  • 25. w3.org/TR/DOM-Level-3-Events
  • 26. // DOM Level 3 … better?blah.addEventListener("keydown", function(e) { … switch (e.key) { case Left: // left break; case Up: // up break; case Right: // right break; … }}, useCapture);
  • 27. key repeats and lag[keydown]+ > keyup[keydown > keyup]+
  • 28. minimise form input / text entry
  • 29. 1. display size2. input mechanisms3. features/performance
  • 30. tl;drdesign like for mobiles … 5 years ago
  • 31. www.webkit.org/perf/sunspider/...
  • 32. CSS3 transitions / animations vs JS
  • 33. paulirish.com/2012/why-moving-elements...
  • 34. microjs.com
  • 35. developer.lge.com
  • 36. html5test.com
  • 37. // Feature detect?var hasStorage = (function() { try { localStorage.setItem(mod, mod); localStorage.removeItem(mod); return true; } catch(e) { return false; }}());
  • 38. dev-test.nemikor.com/web-storage/support-test
  • 39. no magic bullet...
  • 40. testing and debugging
  • 41. developer.lge.com
  • 42. developer.vieraconnect.com
  • 43. developer.vieraconnect.com
  • 44. samsungdforum.com
  • 45. developers.google.com/tv
  • 46. opera.com/business/tv/emulator
  • 47. dev.opera.com/tv
  • 48. console.maban.co.uk
  • 49. @patrick_h_laukeslideshare.net/redux