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Introduction to AJAX II

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Web application
a client-server software application in which the client (or user interface) runs in a web browser
With Ajax, web applications can send ...
... data to and retrieve from a server asynchronously (in the background) without interfering with the display and behavior of the existing page.
... using the XMLHttpRequest object.
Data can be retrieved ...
Despite the name, the use of XML is not required
JSON is often used in the AJAJ variant, and the requests do not need to be asynchronous
XMLHttpRequest Object (XHR)
an API available to web browser scripting languages such as JavaScript. It is used to send HTTP or HTTPS requests to a web server and load the server response data back into the script
an open standard format that uses human-readable text to transmit data objects consisting of attribute–value pairs. It is the primary data format used for asynchronous browser/server communication (AJAJ), largely replacing XML (used by AJAX).
a group of interrelated web development techniques used on the client-side to create asynchronous web applications. Unlike its predecessor AJAX, which uses XML
Ajax is not a technology, but a group of technologies
. HTML and CSS can be used in combination to mark up and style information. The DOM is accessed with JavaScript to dynamically display – and allow the user to interact with – the information presented