AJAX - The onreadystatechange Property

The onreadystatechange Property

After sending a request to the web server, we need a function to receive the data returned from the server.

The onreadystatechange property stores the function that will process the response from a server. This function is stored in the property and is called automatically.

Syntax:-
xmlhttp.onreadystatechange=function()
{
// code here
}

source:http://www.botskool.com/programming-tutorials/ajax-tutorials/ajax-basic-tutorial