A new tutorial on the Oracle Technology Network guides developers through the process of getting AJAX and their Java applications to work well together. The article is titled Enabling Data Exchange in AJAX  Applications and is written by Andrei Cioroianu.

The article focuses on how to transfer data from an AJAX client to a server, using the URL encoding and XML formats. It also guides developers on how to validate the data with XML Schema, extract the needed information with XPath and produce XML or JSON responses on the server side. Finally the article talks about how to handle the XML and JSON responses with JavaScript and how to generate dynamic content that is used to update the Web page in the browser.

The author writes, “The goal of this article is to provide everything you need for implementing data exchange in AJAX  applications, using the best techniques and the most recent APIs. The included sample code is organized in three packages: util, model, and feed. The util package contains classes that provide methods for XML parsing, Schema-based validation, XPath-based querying, DOM serialization and JSON encoding. The model package contains an example data model that can be initialized from an XML document and then converted to the JSON format. You’ll also find a Schema example (used for XML validation) in the model directory. The feed package has classes that simulate a data feed, whose information is retrieved every 5 seconds with AJAX in order to refresh a Web page. The article explains how to avoid a memory leak in the Web browser, by aborting unfinished AJAX  requests and deleting the XMLHttpRequest objects after using them. “

To access the article, please visit http://www.oracle.com/technology/pub/articles/cioroianu-ajax-data.html?rssid=rss_otn_news