XML HTTP Request

The XMLHttpRequest Object

The XMLHttpRequest object is used to exchange data with a server behind the
scenes.

The XMLHttpRequest object is a developer’s dream, because you can:

  • Update a web page without reloading the page
  • Request data from a server after the page has loaded
  • Receive data from a server after the page has loaded
  • Send data to a server in the background

To learn more about the XMLHttpRequest object, study our


XMLHttpRequest Example

When you type a character in the input field below, an XMLHttpRequest is sent to the server
– and
name suggestions are returned (from a file on the server):

Type a letter in the input box:

First Name


Suggestions:


Create an XMLHttpRequest Object

All modern browsers (IE7+, Firefox, Chrome, Safari, and Opera) have a built-in XMLHttpRequest object.

Syntax for creating an XMLHttpRequest object:

xmlhttp=new XMLHttpRequest();

Old versions of Internet Explorer (IE5 and IE6) use an ActiveX Object:

xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
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