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C H A P T E R 1
Introduction to Ajax
A
synchronous JavaScript and XML (Ajax)
1
is both something old and something new--old
because already existing technologies are used, but new because it combines these existing
technologies into techniques that very few considered previously. Simply put, because of Ajax
a new generation of applications and ideas are bubbling on the developer scene.
A very brief definition of Ajax is as follows:
Ajax is a technology that complements Web 2.0 and the integration of many web
services at once.
This brief definition poses more questions than it answers, as now you are likely wondering
what Web 2.0 is and what the integration of many web services are.
Web 2.0 can be thought of as the Internet economy.
2
Think about something as typical as
an encyclopedia, and you will start to think about salespeople who carry extremely heavy
books and knock on doors. In a Web 2.0 context, an encyclopedia means Wikipedia (http://
www.wikipedia.org). The Wikipedia project is an open effort by humanity to record itself.
Whereas for a traditional encyclopedia a set of writers and editors write about certain topics,
Wikipedia is created by people who write about what they know. Get enough people together
and you get an encyclopedia that is on the Internet. What is thought-provoking about the Wiki-
pedia project is that anybody can edit it, and therefore it usually contains more current and
unusual information than a traditional encyclopedia. In some instances Wikipedia's self-
correcting capabilities have proven to be problematic, but considering the scale and depth of
the project, those instances have been exceptions.
The second part of Ajax is the integration of many web services at once. Ajax allows a
higher level of interactivity in a HyperText Markup Language (HTML) page than was possible
without Ajax technologies. The result is that an Ajax application changes from a web applica-
tion to a web service manipulation technology. In a traditional web application, navigating
content meant changing HTML pages. With Ajax, navigating content means navigating web
services that could be generating HTML content, or Extensible Markup Language (XML)
content, or other content.
1. http://en.wikipedia.org/wiki/AJAX
2. http://www.oreillynet.com/pub/a/oreilly/tim/news/2005/09/30/what-is-web-20.html
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