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THE MYSTERIES OF
  JAVASCRIPT-FU
 Dan Webb (dan@danwebb.net)
About Me
    JavaScript hacker for
❖
    6 years
    Ruby/Rails for 2 years
❖

    Author of Low Pro,
❖
    DOM Builder, Sumo
    and other stuff
    Prototype Core Team
❖

    http://danwebb.net
❖
A peasant’s language
Web 2.0 has forced
‘real’ programmers to
        master it
JavaScript-Fu is not easy
       to master
The web is awash with
 bad examples and
  worse resources
Developers forced into
refuge behind libraries
    and frameworks
THE ANCIENT MANUALS
      OF JAVASCRIPT-FU
    The Tao Of The Event Handler!
❖

    5 Methods Of DOM Fist!
❖

    Lightning Script Style!
❖

    The 36 Chambers Of Shaolin!
❖
TRANSLATED...

    Working with events
❖

    Working with DOM elements
❖

    Optimisation
❖

    Testing and debugging
❖
THE TAO OF THE
EVENT HANDLER
The essence of browser
 scripting is defining
      behaviour
Big differences in both
browser implementation
      and opinion
The main battle has
always been in one
      area...
INLINE VS SCRIPTED
INLINE EVENT HANDLERS
INLINE EVENT HANDLERS




Applied as soon as the browser
loads the HTML
INLINE EVENT HANDLERS




But what happens when there
is more than one....
Bad JavaScript-fu
SCRIPT-BASED
       EVENT HANDLERS
Attached after element
      has loaded
Very DRY
Separate JavaScript out
in a similar way to CSS
Large numbers of event
handlers choke browsers
WHICH WAY?
    Use script-based event handling by
❖
    default
    If the page is large and this method
❖
    results in unresponsiveness try event
    delegation
    If all else fails go for inline event
❖
    handling
EVENT BUBBLING

 <body>     handler


 <div>

 <p>

 <a>         click
EVENT DELEGATION
BETTER INLINE HANDLERS
BETTER INLINE HANDLERS
5 METHODS OF
  DOM FIST
There are 5 methods for
    updating HTML
3 official methods
       (W3C)
$('kungfu').appendChild(node);
$('kungfu').insertBefore(node, child);
$('kungfu').replaceChild(node, child);
1 non-standard method
(you guessed it, from IE)
DOM VS innerHTML
DOM METHODS
Insert elements with
      precision
But you need to create
   the nodes first...
ARGH!
LOWPRO’S DOM BUILDER
INNERHTML
Can shift large amount
  of HTML quickly...
...but you don't get
    much control
Incredibly simple
 to use with Ajax
WHICH WAY?

    No clear winner
❖

    DOM is good for more surgical
❖
    manipulation
    innerHTML is good for replacing large
❖
    amounts of content or simple jobs
and the final method...
THE BASTARD SON
LIGHTNING
SCRIPT STYLE
~134KB
5 HTTP
requests
Takes time to download
  and evaluate script
The less JavaScript
    the better
Browsers normally only
try to load 2 resources
      concurrently
Combine .js files
Use GZIP compression
not JS based minification
Make sure everything
    is cachable
FASTER LOOPS
FASTER LOOPS
BE CAREFUL WITH
            SELECTORS
THE 36 CHAMBERS
   OF SHAOLIN
You're going to need
    a few tools...
Buy a Mac
Parallels Workstation

    PARALLELS
   WORKSTATION
Get Firebug
What about the other
    browsers?
And then there's
   testing...
SELENIUM

    Written by ThoughtWorks
❖

    Implemented in HTML/CSS
❖

    Test cases define a series of user
❖
    actions (using HTML)
    Assertions check the correct results
❖
LEARNING MORE
LEARNING MORE
    Dan Webb: http://www.danwebb.net
❖

    Low Pro: http://www.danwebb.net/lowpro
❖

    Parallels: http://parallels.com
❖

    Firebug: http://getfirebug.com
❖

    Selenium: http://www.openqa.org/
❖
    selenium/
QUESTIONS?

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The Mysteries Of JavaScript-Fu (@media SF Edition)