How to Return Ajax Response From Asynchronous JavaScript Call: Methods and Code Examples

When JavaScript is used in conjunction with XML or REST APIs, you can create some useful behaviors with a set of web-development techniques collectively known as Ajax. Let’s take a look at a specific Ajax functionality: returning an Ajax response from an asynchronous JavaScript call.
First, What Is Ajax?
Asynchronous JavaScript and XML, or Ajax, isn’t a new technology in itself, and it’s not a programming language. The term was coined back in 2005 by Jesse James Garrett. As the Mozilla Developer Network explains, Ajax “describes a ‘new’ approach to using a number of existing technologies together, including HTML or XHTML, Cascading Style Sheets, JavaScript, The Document Object Model, XML, XSLT, and most importantly the XMLHttpRequest object."

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