Advantage and disadvantage of Ajax
Hi everyone in this blog I’m explaining about advantage and
disadvantage of Ajax.
to load data in the background and display it on your webpage, without
refreshing the page. This allows you to create websites with much richer
functionality. Popular web applications like Gmail, Outlook Web Access, and
Google Maps uses AJAX extensively, to provide you with a more responsive,
Using AJAX can be a bit cumbersome, because the various browsers have different
implementations to support AJAX. Normally this would force you to write code to
respond differently, depending on the browser, but fortunately, jQuery has done
this for us, which allows us to write AJAX functionality with as little as a
single line of code.
You should be aware of the fact that there are both advantages and
disadvantages to using AJAX on your page though, which means that you should
always consider carefully before deciding to use it instead of doing a regular
postback to the server. Here's a summary:
page will be more pleasant to use, when you can update parts of it without
a refresh, which causes the browser to flicker and the statusbar to run.
you only load the data you need to update the page, instead of refreshing
the entire page, you save bandwidth.
register in the browsers history, making it impossible to use the Back and
Forward buttons to navigate between various states of the page.
the same reason, a specific state can't be bookmarked by the user.
loaded through AJAX won't be indexed by any of the major search engines.
will not be able to use the functionality that you provide through AJAX.
The first two items on the list may be circumvented though,
typically through the use of an iframe and reading and writing data from the
part of the URL after the # character.
in my next post i'll explain about File Upload Using Ajax