2. Introduction
John Sutherland
http://sneeu.com/john/
3. The talk
• It’s all about the future
• Silverlight, AIR both failed to take off
• The browser isn’t going anywhere
• And open standards are the way forward
4. The talk (2)
• Interested in too many things
• Loads of talk ideas
• A few frontend, a few backend
• Nothing I thought would be > 5 minutes
• So ... 5 small topics = 30 minutes
5. The topics
• XHTML 2.0 & HTML 5
• CSS 3.0
• ECMAScript 4 (JavaScript 2)
• WTF is CouchDB?
• WTF is Comet? (the money-shot)
8. X2: What’s cool?
• No more shitty tags: acronym, b, i, tt,
font, basefont, big, small, or iframe
• Sections and headers: section and h
• Any thing can be a link with @href
• The new navigation list, nl
9. X2: What’s not cool?
• h1-h6 remain despite section and h
• a and img are still around
• The lengthy and closed W3C process
10. H5: What’s cool?
• The new m element (for marked/
highlighted)
• input@type is now on speed
• The process is more open than XHTML 2
11. H5: What’s not cool?
• font returns‽
• Predefined @class names
• Continued support for b, i, iframe,
small & co.
14. It’s going to rock
• Multiple background images
• Box shadows
• Multi-column layout
• Hot-ass attribute & pseudo selectors
• Media queries
• Advanced layout
15. Multiple backgrounds
#content {
background:
url(top_center.png) repeat-x top
url(top_left.png) no-repeat left top
url(top_right.png) no-repeat right top;
}
17. Some of it works now!
• :target pseudo selector in FF & Safari
• text-shadow property in Safari
• Multi-column layout in FF & Safari
• Multiple backgrounds in Safari
21. Type Annotations
• function indexOf(
needle : string,
haystack : string) : int {
// ...
}
• var age : int = 25;
• var name : string! = quot;Johnquot;;
22. Classes
class WebDeveloper extends Developer {
// must be initialised:
var favDoctype : string!;
override function say(s) {
return quot;<![CDATA[quot; + s + quot; and AJAX!]]>quot;;
}
}
var d = new WebDeveloper;
23. Classes (2)
• final keyword: cannot be extended
• dynamic keyword: can have properties
added at runtime
• Interfaces: just like Java used to make
24. Functions
• generic keyword: overload function
names, just like Java
• Better var-args
function f(fixed : String,
...extras : [String]) {}
• intrinsic keyword: operator
overloading
25. More
• let blocks:
let (x = 0) { /* x == 0 */ }
// x is undefined
• for each:
for each (
let n in [1, 2, 3, 5]) // ...
33. You know AJAX ...?
• Great for async- sending to the server
• Rubbish for async- receiving from the
server
• Chat
• Real-time data: stock prices; Weewar
• Other server-event stuff
34. Comet solves it
• The name is a play on the AJAX bleach
• All sorts of ways to implement it, ‘Comet’
refers to them all
• “Forever frame”
• Dynamic script long polling
• XHR long polling
35. Comet solves it (2)
• All Comet implementations are mondo-
hacks
• Recent hype is about Bayeux:
• Dojo Foundation specification
• A standard way to pass around JSON
• A pub/sub model
36. Client-side
• Pages & screens served up as normal
• Use XHR long polling to wait for events
• Server blocks until event worth returning
37. JavaScript libraries
• Dojo: loads working; responsible for
Bayeux.
• jQuery: plugin available
• Prototype: couldn’t find much
• MooTools: discussion in the forums
38. The server-side
• I’ve mostly looked at Python
• twisted-cometd
• Orbited (pyEvent based)
• pyorbited (Python Comet client)
• Certainly tools in most languages
• Jetty 6.1 (Java app-server with comet)
44. c bna
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