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There will be hardly any web application in ear of web 2.0, which does not employ AJAX. Actually, you can’t imagine an interactive application without AJAX. AJAX is an integral part of web development stack. In this tutorial, we shall explain about AJAX and how can we implement AJAX. Let’s start with what wikipedia says about AJAX. 1. A method for exchanging data asynchronously between browser and server, thereby avoiding page reloads. The XMLHttpRequest (XHR) object is usually used, but sometimes an IFrame object or a dynamically added tag is used instead. 2. A format for the data sent to the browser. Common formats include XML, pre-formatted HTML, plain text, and JavaScript Object Notation (JSON). This data could be created dynamically by some form of server-side scripting.

Did you ever notice that sometimes your tab title gets updated on it’s own while you are browsing websites in other tab. There are many websites that do it. For eg. you shall notice that GMAIL update the title tab with counter of total number of unread email, each time your receive a new email. It’s a good practice to notify your customer that – something has just happened which needs your attention. That way your customer would not loose that important task and you would not loose that customer. Sounds Great!!

pjax is a jQuery plugin that uses ajax and pushState to deliver a fast browsing experience with real permalinks, page titles, and a working back button.

If you're running an AJAX application with content that you'd like to appear in search results, we have a new process that, when implemented, can help Google (and potentially other search engines) crawl and index your content. Historically, AJAX applications have been difficult for search engines to process because AJAX content is produced dynamically by the browser and thus not visible to crawlers. While there are existing methods for dealing with this problem, they involve regular manual maintenance to keep the content up-to-date

Offline.js is a library to automatically alert your users when they've lost internet connectivity, like Gmail. It captures AJAX requests which were made while the connection was down, and remakes them when it's back up, so your app reacts perfectly. It has a number of beautiful themes and requires no configuration.

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