Ajax (asynchronous javascript and xml)

Ajax ( short for Asynchronous JavaScript and XML ) is a group of inter- related web development techniques used for creating interactive web applications is done on the client side .Aॅdjks is also used for rich user interaction . Refresh or update any part of the web page can also be made ​​without the whole page refresh .The use of Ajax techniques interactive or dynamic interfaces on web pages has increased . Usually XMLHttp data is retrieved using the request object . Despite the name, the use of JavaScript and XML is not actually required , nor request ( request ) need to be asynchronous .Techniques for asynchronous loading of the material appeared in the mid 1990s . The first version of the Java language, Java applets beginning in 1995 . After it loads a web page to load data asynchronously allow compiled client-side code .Several times a page of HTML or creating web pages or interactive (interactive) to create scripts require . There are some scripts that run in your browser as the client side javascript. But the important thing is that AJAX is a script that is run on the web server . Google Sites makes considerable use of AJAX .Drawbacks
Developing Ajax interface is harder than static pages .Dynamic web page updates a user to bookmark a particular state of the application to make it difficult .Ajax -powered Web server interfaces and their back- end database ( or other ) to increase the number of user -generated requests can . This response times and / or additional hardware requirements increase .The user interface can be confusing or can temporarily treat the common web patterns are not followed .