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AJAX is a developer's dream, because you can:Read data from a web server - after the page has loadedUpdate a web page without reloading the pageSend data to a web server - in the background
<!DOCTYPE html>
<html>
<body>
<div id="demo">
<h2>Let AJAX change this text</h2>
<button type="button" onclick="loadDoc()">Change Content</button>
</div>
</body>
</html>
The HTML page contains a <div> section and a <button>.
The <div> section is used to display information from a server.
The <button> calls a function (if it is clicked).
The function requests data from a web server and displays it:
function loadDoc() {
const xhttp = new XMLHttpRequest();
xhttp.onload = function() {
document.getElementById("demo").innerHTML = this.responseText;
}
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
}
AJAX = Asynchronous JavaScript And XML.
AJAX is not a programming language.
AJAX just uses a combination of:
XMLHttpRequest
object (to request data from a web server)AJAX is a misleading name. AJAX applications might use XML to transport data, but it is equally common to transport data as plain text or JSON text.
AJAX allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.
Modern Browsers can use Fetch API instead of the XMLHttpRequest Object.
The Fetch API interface allows web browser to make HTTP requests to web servers.
If you use the XMLHttpRequest Object, Fetch can do the same in a simpler way.