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What is AJAX?

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AJAX stands for Asynchronous JavaScript And XML & is used to connect with servers through XMLHttpRequest object. The programming tool integrates several programmes such as JavaScript, HTML, XML, CSS & DOM. You may transmit and receive data without refreshing the web page asynchronously. You may just transmit relevant information to the server, not the whole page using AJAX. Only useful data are sent to the server-side from the client-side. It interactivities and accelerates your application. AJAX is not a language of programming.

AJAX's two main characteristics:
Make server queries without the page being reloaded.
Get data from the server and deal with it.

AJAX simply employs a mix of:
An XMLHttpRequest object integrated within the browser.
HTML DOM and JavaScript

Where Can AJAX be used?
Login forms: The user can enter their login credentials in the original page form; their program will make a request to the server to log in, and the page will be changed as necessary.

Auto-complete: When you run a query in the Google search box with autofill enabled, recommendations will appear in the drop-down below.

Person content updates: When a user tweets, it is posted to their feed and everything is updated.

Open standards used by AJAX
HTML and Cascading Style Sheets browser-based presentation.
Data is saved and caught from the server in XML format.
Data retrieves behind the scenes using browser XMLHttpRequest objects.
To make it all happen, JavaScript is used.

What are the reasons for using Ajax?
The user request can be changed without refreshing the page
Once the page has been loaded, the server generates data
Upon loading the page, get data from the server
In the background, send data to the server

How does AJAX function?
An event takes place on a website
JavaScript creates an XMLHttpRequest object
A web server query is sent by the object XMLHttpRequest
The server processes the query
The server will provide a reply to the web page
JavaScript reads the response
JavaScript does the right action.

Example

<html>
<body>

<div id="example">
  <button type="button" onclick="example()">Click Here</button>
</div>


<javascript>

function example() {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
    document.getElementById("example").innerHTML = this.responseText;
    }
  xhttp.open("GET", "ajax_info.txt", true);
  xhttp.send();
}

</javascript>
</body>
</html>
Ammar Javed

Ammar Javed

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