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| AJAX: Redefining Web Applications |
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When the number 4 is entered, the output
looks like:
If you do not provide any value, it behaves
similar as shown below:
Checking it again with number 27.
In the above servlet, we used simple StringBuffer class to create a JSON object as a response string. This response string is then parsed at the client-side by using the JavaScripts eval() function.
The extracted data is then placed into the different UI elements of the web page.
Advantages
We can build rich Internet applications with AJAX.
The interface is much more responsive. The user has the feeling that changes areinstantaneous.
Waiting time is reduced.
If a page section encounters an error,
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other sections are not affected (if not logically linked) and the data already entered by the user is not lost.
Traffic to and from the server is reduced considerably.
Disadvantages
The web page cannot connect with the browser history engine.
AJAX is not meant to be used in every application. One of the main reasons for this stays in the fact that search engines cannot index it. So, keeping this in mind, a much better idea than creating complete AJAX application, it would be better to scatter AJAX features within the application.
Not all browsers (especially older ones) have complete support for JavaScript or the XMLHttpRequest object.
Some examples of popular websites using AJAX:
Following are some popular websites using AJAX:
Google Suggest
Google Maps
GMail
Google Reader
Blogger
Flickr
YouTube
Ajax isnt a technology: its a group of ideas that, used together, have proven very powerful to make the web applications more interactive, but is not meant to be used in every web application.
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Nov
2007 | Java Jazz Up | 56 |
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