AJAX jQuery Tutorial - An Introduction
jQuery is available on jquery.com in two versions, minified & uncompressed, minified version a has very small size, but you may need the uncompressed version to study & understand, or to make some modifications. It is highly recommended that you use the minified version on production environment.
In addition to the above some internet companies have hosted jQuery on CDNs for public use, here is a list of the most popular ones:
Google Ajax API CDN (Also supports SSL via HTTPS)
Microsoft CDN (Also supports SSL via HTTPS)
http://code.jquery.com/jquery-1.7.1.min.js Minified version
http://code.jquery.com/jquery-1.7.1.js Source version
Here, is a simple demo of both native AJAX code & jQuery AJAX code, you'll see how no-brainer it becomes to write it with jQuery.
The best thing about jQuery are its rich & fast selector engine, let's see a practical example to demonstrate the easy of accessing DOM elements.
Another beauty of jQuery is in event handling, you can bind and unbind to events & objects, see how easy it is with jQuery.
There are many more types of events that can be handled this way, please go through the jQuery documentation for an exhaustive list.
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