Ajax

What is the fundamental behind Ajax?

XmlHttpRequest is the fundamental behind Ajax. This allows the browser to communicate to a back end server asynchronously.XmlHttpRequest object allows the browser to communicate with server with out posting the whole page and only sending the necessary data asynchronously.

What is AJAX?

Ajax is a set of client side technologies that provides asynchronous communication between user interfaces and web server. So the advantages of using Ajax are asynchronous communication, minimal data transfer and server is not overloaded with unnecessary load.

What is JSON?

JSON is a very lightweight data format based on a subset of the JavaScript syntax, namely array and object literals. JSON allows communicating with server in a standard way. JSON is used as communication notation instead of XML.

          var oCar =    

        {

         "color”: "Yellow",

         "Speed”: 100,

        };

        alert (oBike.color); //outputs " Yellow "

        Alert (oBike.Speed); //outputs 100

The above code creates a JavaScript object Car with two properties Color and Speed