XMLHttpRequest: A Comprehensive JavaScript Tutorial
Introduction
XMLHttpRequest (XHR) is a powerful JavaScript object that enables asynchronous communication
between web browsers and servers
It plays a crucial role in creating dynamic, interactive web applications by allowing you to fetch data from remote locations without blocking the user interface.
Understanding XMLHttpRequest
XMLHttpRequest provides methods and properties for sending and receiving data to and from a server.
The core functionality involves
creating an XHR object, opening a connection to a specified URL, sending a request, and handling the response.
Creating an XMLHttpRequest Object
JavaScript
var xhr = new XMLHttpRequest();
Use code with caution.
Opening a Connection
JavaScript
Use code with caution.
‘GET’: Specifies the HTTP method.
The URL of the resource to request.
true: Indicates that the
equest is asynchronous.
Sending the Request
Use code with caution.
The onload event listener 100% Active Spain Phone Number List is triggered when the request
completes successfully.
The xhr.status property indicates the HTTP status code of the response.
The xhr.responseText property contains
the response data as a string.
Error Handling
};
Use code with caution.
Asynchronous Requests
XMLHttpRequest is designed to handle asynchronous requests, meaning the browser can continue processing other tasks while the request is in progress. This improves user experience by preventing the
UI from freezing.
HTTP Methods
GET: Retrieves data from a specified resource.
POST: Sends data to a server for processing.
PUT: Updates a resource.
Deletes a resource.
HEAD: Retrieves metadata about a resource without the content.
OPTIONS: Retrieves information about the communication options available.
Data Formats
JSON: A popular format for structured data.
XML: A markup language for structured data.
Plain text: For
simple text-based data.
Example: Fetching Data from an API
is a powerful tool for building dynamic Kenya phone number web applications. By understanding its core concepts and methods, you can effectively fetch data from remote servers and create interactive user experiences.
Sources and related content
