Presentation of JSConf.eu

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I went to JSConf.eu 2009 and was asked to present a "summary" of my take aways from the conference at Gothenburg DotnetForum in December 2009.

JSConf.eu JavaScript Berlin 7-8 Nov 2009

[email_address] j Solutions n Solutions i Solutions Java .NET IBM i

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Presentation of JSConf.eu

1. JSConf.eu JavaScript Berlin 7-8 Nov 2009

2. [email_address] j Solutions n Solutions i Solutions Java .NET IBM i

3. JSConf.EU

4. JS in Browser Performance Yahoo!

5. Google

6. Velocity (conf)

7. Rules and tools

8. YSlow & Page Speed

9. Stairway to heaven

10. High Performance Web Sites 14 regler fewer http requests

11. use a CDN

12. expires content-cache

13. gzip

14. stylesheets at top

15. scripts at bottom

16. ...

17. Even Faster Web Sites web 2.0 - front end Responsive webapps

18. Splitting initial load

19. Loading w/o blocking

20. Coupling async scripts

21. Writing efficient js

22. Optimize images

23. Flush document early

24. Simplify CSS selectors

25. Loading JS - LABjs Olika tekniker XHR Eval

26. XHR Injection

27. Script in Iframe

28. DOM Element

29. Script Defer

30. document.write Cavemen can do it!

31. BAD BAD BAD <script src="framework.js"></script> <script src="plugin.framework.js"></ <script src="myplugin.js"></script> <script> myplugin.init(); </script> <script> framework.init(); framework.doSomething(); </script>

32. What is good?

33. LABjs - LoadingAndBlocking <script> $LAB .script("framework.js"). wait () .script("plugin.framework.js") .script("myplugin.js") .wait(function(){ myplugin.init(); framework.init(); framework.doSomething(); }); </script>

34. Objektorienterad CSS CSS easy to break existing code

35. immature profession variables

36. prototypes

37. mixins

38. CSS Wish List - Variables @variables hex { facebookBlue : #3b5998; highlight : #ff9933; } h2, h4, h6 { color: hex . facebookBlue ; } @variables <var group name> { <var name>: <value> }

39. CSS Wish List - Mixins @mixin .clearfix { zoom:1 } .clearfix :after { content: "."; display: block; height: 0; clear: both; visibility: hidden; }

40. CSS Wish List - Including .introduction { include: .clearfix ; } .introduction {zoom:1} .introduction:after { content: "."; display: ...; }

41. node.js - Evented I/O for V8 Most popular servers are doing it wrong

42. Most APIs are synchronous

43. The world is async

44. node.js is all async

45. node.js - DNS example var dns = require("dns"); var resolution = dns.resolve4("www.google.com"); resolution.addCallback( function(addresses, ttl, cname) { puts("addresses: "); puts(JSON.stringify(addresses)); } );

46. JS - from birth to closure Genomgång av JavaScript

47. Conditionals, Comparison, Data Types, Functions, Function Arguments, Objects, Inheritance, Scope, Function Scope, Closure, Namespacing, Syntax

48. Using dojox.* dojox.gfx

49. dojox.charting stunning portable cross-browser real-time 2D graphics

50. Party!

51. ECMAScript 5 repair the language block problem

52. variadic functions

53. syntactic sugar IBM - IEEE 754r

54. Close Patent Office

55. SDC 2010

56. Douglas Crockford Just because something is a standard doesn’t mean it is the right choice for every application. Like XML, for example.

57. HTML5 web forms

58. <video>

59. <canvas>

60. offline apps prop: navigator.online events: online, offline window. applicationCache <html manifest="FIL">

61. The Future of Web-Apps Everything's amazing and nobody's happy

62. Many devices - lots of propietary APIs

63. The stuff the user does is SACRED

64. Nielsen gäller ännu: 0.1, 1.0, 10 sekunder

65. Tack, frågor och cred flickr.com/ipom/ flickr.com/janlehnardt/ labjs.com nodejs.com stubbornella.org stevesouders.com javascript.crockford.com

Editor's Notes

Hur många kan CSS? Hur många kan JavaScript? Hur många har läst High Performance Web Sites? Hur många har läst Even Faster Web Sites? Någon som jobbat med webbplats-optimering? Föredrar publiken CSS eller JavaScript? Hur många har haft problem med att läsa ned javascript parallellt? eller känner till problemet? Är JavaScript bra async eller sync?
Jag jobbar på Iptor konsult ab. Tre ben inom konsultingen Jag bloggar på jsolutions.se
150 deltagare över en helg (2 dagar) i centrala Berlin, från 9-18 ett huvudspår 19 förannonserade - hölls i huvudlokalen med runda bord ett basement-spår, 12-13 annonserades sista veckan/allt eftersom Alltså sprängfyllt, första dagen lite sämre, andra bättre
Steve Souders Performance expert, Yahoo. Nu på Google. Anordnar O'Reilly Velocity-konferensen. Lack of progressive rendering makes sites feel slow Learn how to load scripts in parallel Load only scripts needed to render Use YSlow and Google's Page Speed http://developer.yahoo.com/performance/rules.html
Jobbade med att optimera serversidan. Lyckades ibland få bort 10-15 %. Tog ett steg tillbaka, och tittade på vad en browser gör - trappstegsbilden visar detta. 10-15 % serverside = bråkdel av hela upplevelsen We've been doing it wrong! FIXME: Hur mycket förlorar Ebay/Amazon på långsamma sidor?
September 2007 Amazon, AOL, CNN, eBay, Google, MSN, MySpace, Wikipedia, Yahoo! YouTube Efter hur många sekunder tappar man kunder?
June 2009 Mer fokus på web2.0 och JavaScript. Mer om vad som skall in i HTML och inte. 5-12 % är HTML-väntande. En nyckelfaktor är parallella nedladdningar. Browsern skall rita så tidigt som möjligt.
OK - vi vet hur man kan göra, men det är alldeles för svårt - för få gör det.
När börjar browsern rita? När tappar man kunden?
Nicole Sullivan Jobbade på Yahoo, nu Facebook. Klagade lite på CSS. Drömde lite om framtiden.
Går att göra redan nu med preprocessing-steg. Lättare att underhålla!
Ryan Dahl I'm just a programmer.
Robert Nyman http://www.slideshare.net/robnyman/javascript-from-birth-to-closure Geek Meet, JavaScript test JSLint Crockford: Embrace JS Don't try to make it into Java, C or any other language Learn to love it and it's dynamic, loose and prototypical nature
Peter Svensson Scandinavian Web Developer Conference 2009 Google Technology User Group Learning Dojo - ISBN 978-1847192684
Nokia stod för hela notan!
Douglas Crockford JavaScript the good parts, JSON Bejublat om JS nutid och framtid variadic functions - arguments-array är problematisk lägga till class (syntaktiskt socker) *Nu i december röstar man - IBM står på tvären *Kommer till SDC ---------QUOTE!!!---------- http://developer.yahoo.com/yui/theater/video.php?v=crockford-yuiconf2009-state ISBN 978-0596517748
Remy Sharp aktiv inom jQuery Sammanfattade HTML 5 som det ser ut just nu.
Dion Almaer Google, Mozilla, och nu Palm WebOS Sometimes we have to use some weird version of C Louise CK: Klippet från Conan OBrian SACRED: restore session/document - firefox, word, ... Jacob Nielsen 0.1 the system is reacting instantaneously 1.0 limit for the user's flow of thought to stay uninterrupted 10 limit for keeping the user's attention on the dialogue http://www.useit.com/papers/responsetime.html

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Editor's Notes