Advantages & Disadvantages of Using Ajax

Advantages
Everything has its own merits and demerits, Ajax included.
·         The application seems to become more responsive and interactive as the user gets the response without clicking any buttons.
·         In classic web application, when the web server responds to the web browser with a new page, it may make use of multiple connection threads in order to speed up the process, but this happens for the content only (which is between <body> tags). The CSS as well as the script files present in the head section are transferred using only one connection thread which results in performance degradation. With Ajax, it is required to load only the basic script and CSS files. Rests are requested as content using multiple connections.
·         A big advantage is that the user is not required to keep on waiting and waiting.
·         One more important merit is traffic to and from the server is reduced a considerable amount.
·         If a section of a page encounters any error, other sections do not get affected and the data entered by the user is also not lost.
Disadvantages
·         Ajax application development may lead to increase in development time and cost.
·         The biggest concern is accessibility because all browsers do not completely support Javascript and xmlHttpRequest object.
·         Using Ajax to asynchronously load bits of data into the existing page conflicts the way the users are used to viewing, navigating and creating bookmarks in a modern browser.
·         Another disadvantage lies in the xmlHttpRequest object itself because one can use it to access information from the host that served the “initial page” (due to security reasons).

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