scripting apis for the web
TRANSCRIPT
Scripting APIs for the Web
Dean Jackson
AJAXA.J.A.X
Ajax
HTML1
Client Server
HTML2
HTML3
HTML
Client Server
XMLHttpRequest
Web APIs Working Group
XMLHttpRequestWindow
Application
Toolkit
Architecture
Standardise existing behaviour wherever
possible
1
Get implementors involved
2
Open channels of communication
(in both directions)
3
Work quickly
4
XMLHttpRequest
Allows a script to asynchronously fetch data from a remote host.
var req = new XMLHttpRequest();req.open('GET', '/favourite-animals', false);req.send(null);
if (req.status == 200) { // 200 is HTTP OK alert(req.getResponseHeader(’Content-Type’)); alert(req.responseText);}
HTTP/1.1 200 OKDate: Wed, 24 May 2006 11:38:08 GMTServer: Apache/1.3.33 (Darwin) PHP/4.4.1Last-Modified: Wed, 24 May 2006 11:37:40 GMTETag: "13b15b-33-44744584"Accept-Ranges: bytesContent-Length: 51Content-Type: text/plain
koalakangaroowallabyemuplatypusechidnawombat
• return codes
• setting headers
• security model
XMLHttpRequest
http://www.w3.org/TR/XMLHttpRequest
Window
An interface that allows a script to communicate with the browser
context.
• location
• embedded documents
• timer methods
• security considerations
// we don’t need to use document.window as// window is the default ECMAscript context
// create a function to be called in a while
function ping() { alert(”Hello Ediburgh!”);}
// call the ping function in 1000 milliseconds
var timerID = setTimeout(ping, 1000);
Window
http://www.w3.org/TR/Window
DOM Level 3 Events
• added support for namespaced events
• new event types
• deprecating/simplifying some features
• community feedback on whether event groups are needed
DOM Level 3 Events
http://www.w3.org/TR/DOM-Level-3-Events
Remote Events for XML (REX)
http://www.w3.org/TR/REX
Selectors
XPath Selectorsvar imgs = document.evaluate(
"//img",
document,
null,
XPathResult.ANY_TYPE,
null);
CSS Selectors
var imgs =
document.matchAll(“img”);
• DOM Level 3 Core
• Client side storage
• File upload
• Better networking
• Timers
Declarative vs Programmatic
Building a Web Operating System
thanks!!!
