AJAX Introduction

## AJAX Basic

AJAX HOME AJAX Intro AJAX Example

## AJAX XMLHttpRequest

XHR Create Object XHR Request XHR Response XHR readyState

## AJAX Advanced

AJAX ASP/PHP AJAX Database AJAX XML File

## AJAX Examples

AJAX Examples

# AJAX Introduction

« Previous
Next Chapter »

AJAX is about updating parts of a web page, without reloading the whole page.

## What You Should Already Know

Before you continue you should have a basic understanding of the following:

- HTML / XHTML
- CSS
- JavaScript / DOM

If you want to study these subjects first, find the tutorials on our Home page.

## What is AJAX?

AJAX = Asynchronous JavaScript and XML.

AJAX is a technique for creating fast and dynamic web pages.

AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.

Classic web pages, (which do not use AJAX) must reload the entire page if the content should change.

Examples of applications using AJAX: Google Maps, Gmail, Youtube, and Facebook tabs.

## How AJAX Works

## AJAX is Based on Internet Standards

AJAX is based on internet standards, and uses a combination of:

- XMLHttpRequest object (to exchange data asynchronously with a server)
- JavaScript/DOM (to display/interact with the information)
- CSS (to style the data)
- XML (often used as the format for transferring data)

| AJAX applications are browser- and platform-independent!

## Google Suggest

AJAX was made popular in 2005 by Google, with Google Suggest.

Google Suggest is using AJAX to create a very dynamic web interface: When you start typing in Google's search box, a JavaScript sends the letters off to a server and the server returns a list of suggestions.

## Start Using AJAX Today

AJAX is based on existing standards. These standards have been used by developers for several years. Read our next chapters to see how it works!

« Previous
Next Chapter »

## Your suggestion:

Your E-mail (optional):

Page address:

Description:

Close [X]

## Thank You For Helping Us!

Your message has been sent to W3Schools.

Close [X]
Search w3schools.com:

## WEB HOSTING

Best Web Hosting UK Reseller Hosting Wow! $5 SSD Hosting

## WEB BUILDING

Download XML Editor
FREE Website BUILDER FREE Website Creator

## WEB RESOURCES

Web Statistics Web Validation

## SHARE THIS PAGE