Easy Tutorial
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XMLHttpRequest Object

Using the XMLHttpRequest object, you can update a part of a web page without reloading the entire page.

Try It Yourself - Examples

A Simple XMLHttpRequest Example

Retrieve Header Information with getAllResponseHeaders()

Retrieve Specified Header Information with getResponseHeader()

Retrieve Content of an ASP File

Retrieve Content from a Database

Retrieve Content of an XML File

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:

XMLHttpRequest Object Methods

Method Description
abort() Cancels the current request.
getAllResponseHeaders() Returns header information.
getResponseHeader() Returns the specified header information.
open(method,url,async,uname,pswd) Specifies the type of request, URL, whether the request should be handled asynchronously, and other optional attributes. <br> <br>method: Type of request: GET or POST <br>url: Location of the file on the server <br>async: true (asynchronous) or false (synchronous)
send(string) Sends the request to the server. <br> <br>string: Only used for POST requests
setRequestHeader() Adds a label/value pair to the headers to be sent.

XMLHttpRequest Object Properties

Property Description
onreadystatechange Stores a function (or the name of the function) to be called automatically each time the readyState property changes.
readyState Holds the status of the XMLHttpRequest. Changes from 0 to 4: <br>0: Request not initialized <br>1: Server connection established <br>2: Request received <br>3: Processing request <br>4: Request finished and response is ready
responseText Returns the response data as a string.
responseXML Returns the response data as XML data.
status Returns the status number (e.g., "404" for "Not Found" or "200" for "OK").
statusText Returns the status text (e.g., "Not Found" or "OK").
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