When these technologies are combined in the AJAX model, web applications are able to make quick, incremental updates to the user interface without reloading the entire browser page making sites faster.
Although X in AJAX stands for XML, JSON is used more than XML nowadays because of its many advantages such as being lighter and a part of JavaScript. An object containing properties which are used as parameters to the request, a url encoded string or a function to call to get either.
AJAX is not a technology in itself, it is a way of developing Web applications that combines: HTML or XHTML, Cascading Style Sheets, JavaScript, The Document Object Model, XML, XSLT, and the most importantly XMLHttpRequest object.


Also AJAX is asynchronous, so you can run processes in background that can update the UI without any user interaction.
Defaults to the configured method, or if no method was configured, "GET" if no parameters are being sent, and "POST" if parameters are being sent. This example of AJAX request uses JSON, ExtJs JavaScript framework and Java Servlet on the backend. Here we have created a simple Login form that will take a userId and password and then make an AJAX request to validate the request.






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