Ajax with Servlet.1-what is AJAX and XMLHttpRequest

In this tutorial we will learn what is AJAX and what is XMLHttpRequest object and what are its features.

I will brief about why XMLHttpRequest or XHR is so important and we can use to make independent calls to Servlets to get a real time response.

We will see the methods XMLHttpRequest has like open() and send(). We will also see at the properties of XMLHttpRequest like status, onreadystatechange and readystate etc.