Ajax: Creating Web Pages with Asynchronous JavaScript by Edmond Woychowsky

By Edmond Woychowsky

The effortless, Example-Based consultant to Ajax for Every net Developer

 

Using Ajax, you could construct net functions with the sophistication and usefulness of conventional desktop

applications and you'll do it utilizing criteria and open resource software program. Now, for the 1st time,

there's a simple, example-driven advisor to Ajax for each net and open resource developer, regardless of

experience.

 

Edmond Woychowsky starts with uncomplicated thoughts related to basically HTML and easy JavaScript. Then,

one step at a time, he introduces strategies for construction more and more wealthy functions. don't fret if

you're now not knowledgeable on Ajax's underlying applied sciences; Woychowsky bargains refreshers on them, from

JavaScript to the XMLHttpRequest item. you will additionally locate a number of open resource applied sciences and open

standards all through, starting from Firefox to Ruby and MySQL.

 

You'll not just easy methods to write "functional" code, but in addition grasp layout styles for writing rocksolid,

high-performance Ajax functions. you are going to additionally find out how to use frameworks equivalent to Ruby on

Rails to get the activity performed fast.

 

  • Learn how Ajax works, the way it advanced, and what it really is sturdy for
  • Understand the circulation of processing in Ajax applications
  • Build Ajax functions with XML and the XMLHttpRequest object
  • Integrate back-end code, from Hypertext Preprocessor to C#
  • Use XSLT and XPath, together with XPath Axis
  • Develop client-side Ajax libraries to aid code reuse
  • Streamline improvement with Ruby on Rails and the Ruby programming language
  • Use the cross-browser HTML DOM to replace components of a page
  • Discover the simplest Ajax internet assets, together with Ajax-capable JavaScript libraries

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Extra resources for Ajax: Creating Web Pages with Asynchronous JavaScript

Sample text

This function waits for the other frame to load and then copies this form's inner HTML to the other frame. When this is done, the result is the normal-looking web page shown in Figure 2-1. The way it behaves, however, is almost application-like, with parts of the visible page being updated each time the hidden frame does an unload/reload cycle. Figure 2-1. 5. An Ajax Encounter of the Second Kind As flexible and cross-browser capable as the "hidden frames" method of implementing Ajax is, all that has been accomplished is the "AJ" part of Ajax.

Another one of my favorite uses was to use it as a "value has changed" indicator. This indicator would be checked when the form was submitted. Based upon the result of a test, any number of actions could be taken, including producing a client-side error message. 55 56 However, my most favorite was to stash other options for selects. You see, the system that I worked on had pages with several HTML select objects with the contents of each select based upon the selection made in the previous select.

Summary This chapter started with a brief introduction to Ajax that included some of the origins and problems associated with using "mad scientist stuff," such as the accusations of attempting to pass off a mock-up as an actual application and the inability to describe just how something works. Of course, some people still will think Corinthian helmets and hoplites at the very mention of Ajax, but you can't please everyone. Next there was a brief outline of the philosophy behind Ajax, which centers on the idea of not bothering the server any more than is necessary.

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