List some advantages and disadvantages of using Ajax.

Ajax is a very easy concept if one has a sound knowledge of JavaScript. It uses JavaScript functions to call methods from a web service. It has certain advantages-

• Speed- Ajax reduces the server traffic and also the time consumption on the server and client side.
• Ajax is very responsive and fast, data can be transferred at a time.
• XMLHttpRequest plays a significant role in Ajax. It is a special JavaScript object that calls asynchronous HTTP request to the server for transferring data.
• One of the biggest advantages of using Ajax as forms are common elements in the web page. Ajax gives options for validation and much more.
• One doesn’t have to completely reload the page.

There are some disadvantages attached to Ajax. They are-

• Search engines would not be able to index Ajax applications so Ajax maybe a mistake.
• Anyone can have access to the code of Ajax and can view source it.
• ActiveX requests are enabled only in internet explorer and other new browsers.