Ajax (also AJAX
short for asynchronous JavaScript and XML
) is a set of web development techniques using many web technologies on the client side to create asynchronous web applications. With Ajax
, web applications can send and retrieve data from a server asynchronously (in the background) without interfering with the display and behavior of the existing page. By decoupling the data interchange layer from the presentation layer, Ajax
allows web pages and, by extension, web applications, to change content dynamically without the need to reload the entire page. In practice, modern implementations commonly utilize JSON
instead of XML
.
Ajax is not a single technology, but rather a group of technologies. HTML
and CSS
can be used in combination to mark up and style information. The webpage can then be modified by JavaScript to dynamically display—and allow the user to interact with—the new information. The built-in XMLHttpRequest
object, or since 2017
the new "fetch()" function within JavaScript, is commonly used to execute Ajax
on webpages allowing websites to load content onto the screen without refreshing the page. Ajax
is not a new technology, or different language, just existing technologies used in new ways.
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