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.

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.

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.

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.

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.

With Head Rush Ajax, in no time you'll be writing JavaScript code that fires off asynchronous requests to web servers...and having fun doing it. By the time you've taken your dynamic HTML, XML, JSON, and DOM skills up a few notches, you'll have solved tons of puzzles, figured out how well snowboards sell in Vail.If you thought Ajax was rocket science, this book is for you. Head Rush Ajax puts dynamic, compelling experiences within reach for every web developer.

In this tutorial, you'll be introduced to Ajax, a technology that allows you to send these requests through small JavaScript calls, meaning the user doesn't have to wait for the page to refresh.

A tutorial using a JavaScript Ajax library to make form submissions more usable.