AJAX allows you to make a call to an http server (typically an RSS feed or a webpage), get it’s content and load them into your existing page without having to refresh the whole page. This means that services like email don’t have to reload the whole page everytime you click a message, saving on bandwidth (loading the header/footer all over again) and making things more efficient.

This tutorial explains from the very beginning how to use AJAX in web applications. It is assumed you have a knowledge of Javascript (with a little DOM) as well as a server side scripting language, although you should pick it up easily.

If you want to have live data on your website, that will change all on its own without you having to constantly refresh the page, then this tutorial will show you how to. Assumes you have an understanding of the AJAX (XMLHttpRequest) object.

Ever wanted to make your own "live" advanced search that gives you suggestions as you type. This tutorial will show you how to make one just like Google's new "Suggest" search feature.

CAPTCHA has become a popular means of securing forms against automated submission, by requiring users to enter a string displayed in an automatically generated image. This implementation uses Ajax to conveniently combine CAPTCHA into normal pre-submission form verification. You'll need PHP to be installed with the GD image library (most PHP implementations will have this as standard).

Step-by-step tutorial to understand the XMLHttpRequest object and how to use it from JavaScript. Examples with text, XML and JSON files. The tutorial is completed by demo pages that you can use as templates for you own website. Plus a specific JSON tutorial a very simple to use format.

CAPTCHA is a simple test to determine if a user is a computer or a human. It is used to prevent spam abuse on the websites. So if you use CAPTCHA on your web site forms, this can help in stopping some bots and making life harder for other bots in accessing or using your forms. The goal of this tutorial is to demonstrate how to make your own simple CAPTCHA protection using PHP and AJAX technologies.

This is a mini-tutorial on saving state across page loads on the client side, without using cookies so as to save large amounts of data beyond cookies size limits.

In this article, we will take fresh approach and implement an AJAX-powered component that will not only upload the file to server, but also monitor the actual progress of a file upload request in "real time."

This tutorial shows how to create an Asynchronous JavaScript and XML (Ajax) client-side slide show that's animated using "Ken Burns Effects." You'll discover how to build XML data sources for Ajax, request XML data from the client, and then dynamically create and animate HTML elements with that XML.