June 2008
Intermediate to advanced
488 pages
15h 3m
English
Content preview from Dojo: The Definitive GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 4. AJAX and Server Communication
The common thread of this chapter is server-side communications.
Performing asynchronous requests, using the IFRAME transport to submit
forms behind the scenes, serializing to and from JavaScript Object
Notation (JSON), and using JSONP (JSON with Padding) are a few of the
topics that are introduced in this chapter. You'll also learn about
Deferred, a class that forms the
lynchpin in the toolkit's IO subsystem by providing a uniform interface
for handling asynchronous activity.
Quick Overview of AJAX
AJAX[12] (Asynchronous JavaScript and XML) has stirred up
considerable buzz and revitalized web design in a refreshing way.
Whereas web pages once had to be completely reloaded via a synchronous
request to the server to perform a significant update, JavaScript's
XMLHttpRequest object allows them
to now behave much like traditional desktop applications. XHR is an
abbreviation for the XMLHttpRequest
object and generally refers to any operation provided the
object.
Web pages may now fetch content from the server via an asynchronous request behind the scenes, as shown in Figure 4-1, and a callback function can process it once it arrives. (The image in Figure 4-1 is based on http://adaptivepath.com/ideas/essays/archives/000385.php.) Although a simple concept, this approach has revolutionized the user experience and birthed a new era of Rich Internet Applications.
Figure 4-1. The difference between synchronous and asynchronous communication for a web application ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.