Ajax resource center How to create more interactive Web apps with Ajax technologies

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The purpose of this tutorial is to provide a starting point for users who are new to Dojo. Whilst every effort is made to introduce as much as possible about Dojo, it is impossible to include more of the detailed information since to do so would be counter productive and confusing to new users. For more information on the concepts introduced here, please see the links to other resources at the end of this document (Section 8 - Finding More Resources).

AjaxRequest is a layer over the XMLHttpRequest functionality which makes the communication between Javascript and the server easier for developers. Goals of the AjaxRequest Library 1. Simplify the interface to using XMLHttpRequest, making it more logical and consistent with what developers expect. No more worrying about the onreadystate handler or status codes! 2. Add timeout functionality for async requests, allowing extended functionality if Ajax calls take too long 3. Provide activity monitoring features, so developers can provide accurate "busy" indicators to users when Ajax requests are running in the background 4. Support multiple simultaneous requests which will not collide with each other without any additional work from the developer 5. Simplify form submissions, so submitting a form using Ajax is just a single function call. Form serialization, request headers, form targets and methods - they are all taken care of for you! If you are looking for an easy way to break into Ajax programming without figuring out the details of how the requests work using XMLHttpRequest, this library will help you out.

There is no built-in support for a request timeout in the XMLHttpRequest object, but the AjaxRequest object provides this functionality.

You've heard all about this fancy JavaScript toolkit called 'Dojo' and you're a fairly experienced developer but this is a new world and you have no real idea how to get it to work for your project. Here's a quick guide to get up to speed with a couple of Dojo's major strengths, Widgets and Events.

"Ajax" is a buzzword that is gaining momentum and popularity. Applications such as Gmail and Google Suggest serve as massive advertisements for asynchronous JavaScript. As users gain familiarity and their expectations increase, the demand for such interfaces is rising. In this article, I will show how to build Ajax-enabled applications using Dojo and JSON--two very different but complementary technologies that can significantly enhance the interface and usability of web applications. With the help of some simple examples, you will learn how to use Dojo and JSON to build Ajax applications. This article will also demonstrate how to create custom Dojo widgets by implementing the popular "autocomplete" feature for HTML text boxes.

The question: The Ajax request is grabbing the cached page from the previous request, how do I stop this from happening? Well I have seen some fancy approaches by people, but there is one easy solution that works: a random query string value appended to the request.

Learn how to build an Asynchronous JavaScript and XML (Ajax) Really Simple Syndication (RSS) reader, as well as a Web component that you can place on any Web site to look at the articles in the RSS feeds. The first thing I thought about doing when I read about requesting Extensible Markup Language (XML) from JavaScript code on a Web page was to get some RSS and display it. But I immediately ran into the security issue of XML Hypertext Transfer Protocol (HTTP), where a page that comes from www.mysite.com can't address pages from anywhere other than www.mysite.com. My plans to build a generic RSS reader in just the page were dashed. But Web 2.0 is all about ingenuity, and solving the problem of how to create an RSS reader with XMLHTTP teaches a lot about how to program the 2.0 Web. This article walks through the construction of an Ajax-based RSS reader using both XMLHTTP and