First things first, Asynchronous JavaScript and XML (AJAX) is not a technology. AJAX is a technique that has brought about a great change in the world of web development. The AJAX technique comes in response to the increasing demand of interactive web applications. With AJAX, web page exchange small amount of data with the server behind the scene. This means that every time a new piece of data is entered by the user, or there is a request for a change, the entire page does not have to be reloaded. Usability is also greatly affected thanks to AJAX..

Good article about practical using of Yahoo! UI javascript library. 15 code examples with demos are included.

Forms are easy enough to create when they are simple, like search boxes. But what if you need them to be complex? How about changing the forms based on input by the viewer? This is where interactive forms using Javascript and HTML can help. I'll use a simple example on how interactive forms can be useful.

The next generation of web apps make heavy use of JavaScript and CSS. We’ll show you how to make those apps responsive and quick.
With our so-called "Web 2.0" applications and their rich content and interaction, we expect our applications to increasingly make use of CSS and JavaScript. To make sure these applications are nice and snappy to use, we need to optimize the size and nature of content required to render the page, making sure we’re delivering the optimum experience. In practice, this means a combination of making our content as small and fast to download as possible, while avoiding unnecessarily refetching unmodified resources..

Learn how to write a basic, client-side Atlas progress bar, and download the source code.

You almost always want to have your form to be disabled as soon as the user pressed the submit button so that the user doesn't accidently submit the form twice. Here's how.

Web forms often ask visitors for non-essential information, but long and complicated forms can seriously hinder the e-commerce sales process. Wouldn't it be cool to give users the option to hide these optional fields at their own discretion, and with a clever use of Javascript, the DOM and some CSS we can!

The JavaScript cheat sheet is designed to act as a reminder and reference sheet, listing methods and functions of JavaScript. It includes reference material for regular expressions in JavaScript, as well as a short guide to the XMLHttpRequest object. A description of what is on the cheat sheet follows, or if you are impatient, you can go straight to the full size JavaScript cheat sheet..

How to display the current day of the week.

Determine the capabilities of a client browser from the resolution to the user language.