Download books: Head First Ajax

Using AJAX

Web pages: the old-fashioned approach

With traditional web pages and applications, every time a user clicks on
something, the browser sends a request to the server, and the server responds
with a whole new page. Even if your user’s web browser is smart about
caching things like images and cascading style sheets, that’s a lot of traffic
going back and forth between their browser and your server...


With Ajax, the browser only sends and receives
the parts of a page that need to change.


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