One of the costs of working on the web has traditionally been having to work in multiple languages. JavaScript has been the only choice for web front-ends, but as soon as you start back-end work, it can be anything from PHP to Python to Perl to Ruby or even C. Anything, that is, but JavaScript.In the last year server-side JavaScript has leapt forward with a passion, partly due to CommonJS but also due to NodeJS. With these new advances we have an opportunity to enjoy more code re-use, and faster, more efficient pages. We’ll explore server-side JavaScript and look at how we can use a JavaScript DOM/BOM to run YUI3 on NodeJS, allowing us to reuse the same code on the client and the server, deliver targeted experiences to various classes of client, and smoke test DOM operations during continuous integration.

1. YUI and Node.js
Sitting in a tree
S-E-R-V-I-N-G H-T-T-P
Tom Hughes-Croucher
@sh1mmer

2. YUI3 + Node.js
IS SO AWESOME
MY ENTIRE PRESENTATION IS IN
COMIC SANS
AND YOU WILL STILL LOVE ME AT THE END

5. Node.js
• Server-side JavaScript process
• Uses V8
• Non-blocking
• Event Driven
• CommonJS module format

6. AW Node.js
•
ESServer-side JavaScript process
OM
• Uses V8
• Non-blocking
•
•
Event Driven
CommonJS module format E!

7. At JSCONF.US 2010
Node was ⎻⎻⎻⎻⎻ this fast

9. But
Ryan doesn’t roll like that. Ryan rolls like this

11. Why SSJS?

12. JavaScript
programmers
3>2>1

13. Massive Code base of YUI
and other JS libraries
I heard some people use this thing called jQuery,
but I’m not convinced it’ll catch on

14. Laziness or “I’m sick
of writing stuff twice”
I could have said efficiency, but I think we all secretly long to
sit around in our y-fronts. Except Higgins, who already does.

15. Progressive
Enhancement is free*
Remember WWCD (What Would Crockford Do)
*close enough

16. TL;DR:
SSJS is Awesome
Like a Unicorn riding a Narwhal

18. YUI3
Awesome like a Narwhal riding a Unicorn

19. YUI 3
• Modular
• Sandboxed
• Intrinsic component loading
• Core team + community (50+ extensions)
• Not just about manipulating the DOM

20. YUI 3
• Script Loading
• Remote i/o
• Events and Attributes
• Data Manipulation
• Language Utilities
• Templating

22. Making it work - 1
YUI exports itself per the CommonJS spec
if (typeof exports == 'object') {
exports.YUI = YUI;
}

23. Making it work - 2
YUI({
logFn: function(str, t, m) {
if (str instanceof Object || str instanceof Array) {
if (str.toString) {
str = str.toString();
} else {
str = sys.inspect(str);
}
}
// output log messages to stderr
sys.error('[' + t.toUpperCase() + ']: ' + m + str);
}
});

24. Fin.

25. ‘ello World Node Style
#!/usr/bin/env node
var YUI = require("../lib/node-yui3").YUI,
Y = YUI();
Y.log('ello World');

26. ‘ello World YUI Style
#!/usr/bin/env node
require("../lib/node-yui3").YUI().log('ello
World');

27. ‘ello World YUI Style
[~/examples (master)⚡] ➔ ./hello.js
[INFO]: ello World

28. Enabling YUI’s Loader
YUI.add(‘get’, function(Y) {
// reads from file system or creates a httpClient
// for remote data.
Y.Get.script = function(s, cb) {
var urls = Y.Array(s), url, i, l = urls.length;
for (i=0; i<l; i++) {
// doesn't need to be blocking, so don't block.
YUI.include(url, function(err) {
if (err) { Y.log(err, 'error', 'get'); }
pass(cb);
});
// replaced with process.compile so YUI doesn’t
// need to be global
// require.async(url, function (err, mod) {
}
};
});

29. Enabling YUI’s Loader
#!/usr/bin/env node
var YUI = require('../lib/node-yui3').YUI;
YUI({
filter: 'debug'
}).use('event-custom', function(Y) {
Y.on('pwnd', function() {
Y.log('Never gonna give you up, never
gonna let you down...');
});
Y.fire('pwnd');
});

30. Enabling YUI’s Loader
[~/examples (master)⚡] ➔ ./loader.js
[INFO]: (yui) Module requirements: event-custom
[INFO]: (yui) Modules missing: event-custom, 1
[INFO]: (yui) Fetching loader: yui_3_1_0_1_12711895820541, ./yui3/build/
loader/loader-debug.js
[INFO]: (get) URL: /lib/yui3/build/loader/loader-debug.js
[INFO]: (yui) Module requirements: yui-base,yui-log,dump,oop,yui-
later,event-custom
[INFO]: (yui) Modules missing: dump,oop,event-custom, 3
[INFO]: (yui) Using Loader
[INFO]: (loader) attempting to load dump, ./yui3/build/
[INFO]: (get) URL: /lib/yui3/build/dump/dump-debug.js
[INFO]: (loader) attempting to load oop, ./yui3/build/
[INFO]: (get) URL: /lib/yui3/build/oop/oop-debug.js
[INFO]: (loader) attempting to load event-custom, ./yui3/build/
[INFO]: (get) URL: /lib/yui3/build/event-custom/event-custom-debug.js
[INFO]: (loader) loader finishing: success, yui_3_1_0_1_12711895820541, yui-
base,yui-log,dump,oop,yui-later,event-custom
[INFO]: (event) yui_3_1_0_1_12711895820544: pwnd->sub:
yui_3_1_0_1_12711895820545
[INFO]: Never gonna give you up, never gonna let you down...

32. Accessing Remote Data
Using the YQL module from YUI Gallery
#!/usr/bin/env node
var sys = require('sys'),
YUI = require('../lib/node-yui3').YUI;
YUI().use('json', 'gallery-yql', function(Y) {
var q = 'select * from github.user.info where
(id = "apm")',
o = new Y.yql(q);
o.on('query', function(r) {
//sys.inspects serializes objects to text
sys.puts(sys.inspect(r));
});
});

33. Accessing Remote Data
[~/src/nodejs-yui3/examples (master)⚡] ➔ ./yql.js
[INFO]: (get) URL: http://query.yahooapis.com/v1/public/yql?
q=select%20*%20from%20github.user.info%20where%20(id%20%3D%20%22apm
%22)&format=json&callback=YUI.yql.yui_3_1_0_1_12711910026086&env=ht
tp%3A%2F%2Fdatatables.org%2Falltables.env&
{ count: '1'
, created: '2010-04-13T08:36:47Z'
, lang: 'en-US'
, results:
{ user:
{ 'gravatar-id': 'fd657f26f290d8869901f0eaf3441b97'
, name: 'Adam Moore'
, login: 'apm'
// -snip-
}
}
}

34. DOM
It’s BOM.

35. What about the DOM?
• YUI isn’t all about the DOM
• But YUI has many DOM-centric modules.
• Being able to use these components on
the server opens up some interesting
opportunities.

36. Rendering HTML -
nodejs-dom
• Dav pulled together two open source projects
to do it:
• jsdom - DOM level 1 support, written in
JavaScript
• node-htmlparser - HTML parser written in
JavaScript. Needed for innerHTML
• These are not nodeJS specific implementations

37. Rendering HTML -
nodejs-dom
• DOM element creation and manipulation
• Selector API
• YUI’s Node API

38. Rendering HTML -
nodejs-dom
#!/usr/bin/env node
var sys = require('sys'), http = require('http'), url =
require('url');
var YUI = require("../lib/node-yui3").YUI;
YUI().use('nodejs-dom', 'node', function(Y) {
var document = Y.Browser.document,
navigator = Y.Browser.navigator,
window = Y.Browser.window;
http.createServer(function (req, res) {
var urlInfo = url.parse(req.url, true);
YUI().use('nodejs-dom', 'node', function(Page) {
document = Page.Browser.document;
navigator = Page.Browser.navigator;
window = Page.Browser.window;
document.title = 'Calendar Test';
Page.one('body').addClass('yui-skin-sam');
var ln = document.createElement('link');
// ...

39. Rendering HTML
http://yuiloader.davglass.com/calendar/

40. Progressive Enhancement
• YUI 2 calendar control is loaded via the YUI
2 in 3 project
• The calendar control is fully rendered on
the server.
• No script.
• Page and nav clicks are round trips.
• If script is enabled, we could enhance the
links to pull only the data for each page and
render on the client.

41. Multiple Response Types
http://yuiloader.davglass.com/template/

42. Multiple Response Types
• First response will render the entire page.
• A client without script can request the fully
rendered page.
• A script enabled client can request just the new
content.
• A script enabled client with the source that is
running on the server can request just the
JSON data structure that creates the content.
• It’s the same code.

43. Other Uses
• Fast utility layer testing with YUI Test.
• Smoke tests for DOM-centric code.
• Could emulate some browser quirks.
• Validation Code

44. Summary
• YUI 3’s design made it easy to get
running on Node.js
• JavaScript libraries are awesomely
valuable on the server side
• Server side DOM shows crazy potential
for a single code base

45. Resources
• YUI: http://developer.yahoo.com/yui/
• Node.js: http://nodejs.org/
• nodejs-yui: http://github.com/davglass/nodejs-
yui3/
• nodejs-yui3loader: http://github.com/davglass/
nodejs-yui3loader
• Test Loader: http://yuiloader.davglass.com/demo/
• http://yuiloader.davglass.com/calendar/

46. Today presentation was
Brought to you by And the fonts:
the letters: Comic Sans
J and S monofur
Tom Hughes-Croucher Slides, etc --> http://
@sh1mmer speakerrate.com/sh1mmer
croucher@yahoo-inc.com Pls rate me. kthxbai.