Download AJAX: Creating Web Pages with Asynchronous JavaScript and by Edmond Woychowsky PDF

By Edmond Woychowsky

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

 

Using Ajax, you could construct internet functions with the sophistication and value 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 internet and open resource developer, regardless of

experience.

 

Edmond Woychowsky starts with easy suggestions concerning purely HTML and uncomplicated JavaScript. Then,

one step at a time, he introduces recommendations for construction more and more wealthy functions. don't be concerned if

you're no longer knowledgeable on Ajax's underlying applied sciences; Woychowsky deals refreshers on them, from

JavaScript to the XMLHttpRequest item. you are going to 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 additionally grasp layout styles for writing rocksolid,

high-performance Ajax functions. you will additionally the right way to use frameworks similar to Ruby on

Rails to get the task performed fast.

 

  • Learn how Ajax works, the way it advanced, and what it is sturdy for
  • Understand the circulate of processing in Ajax applications
  • Build Ajax functions with XML and the XMLHttpRequest object
  • Integrate back-end code, from personal home page 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 elements of a page
  • Discover the easiest Ajax internet assets, together with Ajax-capable JavaScript libraries

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Extra info for AJAX: Creating Web Pages with Asynchronous JavaScript and XML

Sample text

Looking past all of the hype surrounding XML, it is easy to see that XML is merely the text representation of selfdescribing data in a tree data structure. " A tree data structure is built of nodes, with each node having only one node connected above it, called a parent node. The sole exception to this rule is the root node, which has no parent node. Nodes can also have other nodes connected below, and these are calledchild nodes. In addition, nodes on the same level that have the same parent node are called children.

Voilà, instant XHTML! Well, maybe, sometimes, occasionally, except on Tuesdays or at night during a full moon. You see, unfortunately, there is still a potential source of problems. I stumbled on this problem approximately 5 minutes after creating my first XHTML page, and I immediately felt betrayed. The source of the problem was compares in my JavaScript functions. With the assorted compares using ampersand (&), greater than (>), and less than (<), the document wasn't well formed. In my despair, I knew how Victor Frankenstein felt, brought down by creatures of my own creation.

XSLT can be used to transform any XML-derived language, regardless of the source. Listing 2-9 shows a simple Internet Exploreronly web page along the same lines as the earlier examples. By using XSLT and the XMLHttpRequest object to retrieve both the XML and XSLT shown inListing 2-10, it is extremely flexible. This is because after the initial page is loaded, any conceivable page can be generated simply by changing the XML and/or the XSLT. Sounds pretty powerful, doesn't it? Listing 2-9. 0'); var objXMLHTTP; /* Obtain the initial XML document from the web server.

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