Updating web pages with ajax

A callback is made to a web service that will retrieve all values that begin with these characters.

Another great example is when the client needs to save or retrieve session values from the server, based on a user preference such as the height, width or position of an object.

Adjusting the width could make a callback to the server to set the session variable for the new width.

There are 4 main benefits of using Ajax in web applications: Ajax callbacks can be done by instantiating an XMLHttp Request object in the client-side Java Script.

The XMLHttp Request object can be used to directly call server-side objects like pages and web services.

Ajax is not a programming language or a tool, but a concept.

Ajax is a client-side script that communicates to and from a server/database without the need for a postback or a complete page refresh.When it comes to Ajax and Java Script, JSON Web Services are replacing XML Web Services.Another major advance to Java Script and Ajax is the Java Script object library called j Query.This free, open-source software is a wrapper around Java Script.j Query is used to easily write client-side Java Script to navigate and manipulate a page and make asynchronous Ajax callbacks.The best definition I’ve read for Ajax is “the method of exchanging data with a server, and updating parts of a web page – without reloading the entire page.” Ajax itself is mostly a generic term for various Java Script techniques used to connect to a web server dynamically without necessarily loading multiple pages.

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