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The Advantages and Disadvantages of Ajax

Posted on: February 5, 2009



Ajax Overview

Ajax, or AJAX is a group of inter related web development techniques used to create interactive web applications. With ASP.NET Ajax, web applications can retrieve data from the server asynchronously in the background without interfering with the display and behavior of the existing page reactions.

These are some users comments regarding the usability of AJAX on the web applications

Ajax Advantages

1) Since scripts and style sheets only have to be requested once using Ajax, then this will allow smaller amount of connections to the web server, thus reducing loading time for the web applications.

2) Users can now expecting the loading time of the application to be faster or more responsive, even if the application has not changed on the server side.

3) The use of asynchronous requests allows the client’s Web browser user interface to be more interactive and to respond quickly to inputs, and sections of pages can also be reloaded individually.

Ajax Disadvantages

1) Testing tools for Ajax often do not understand Ajax event models, data models, and protocols.

2) Pages dynamically created using successive Ajax requests do not automatically register themselves with the browser’s history engine, so clicking the browser’s “back” button may not return the user to an earlier state of the Ajax-enabled page, but may instead return them to the last full page visited before it.

3) Dynamic web page updates also make it difficult for a user to bookmark a particular state of the application.

4) Any user whose browser does not support Ajax or JavaScript, or simply has JavaScript disabled, will not be able to use its functionality.

5) In some cases, overuse of Ajax will caused the web page not index properly by the search engines because because most web crawlers do not execute JavaScript code on the particular web page.

There are pro and cons of using Ajax on your web application, however ,with proper knowledge and programming skills, you will be able to turn the cons into the valuable assets for your Ajax web applications.

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