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ajax http response example

Ajax refers to asynchronous java script and xml. It is not a not a programming language. Ajax is of Asynchronous type. It normally uses XML, plain text or JSON to communicate with server i.e. for data transfer.

Note: Ajax is technology independent.

As we discussed in previous tutorial that XMLHttpRequest object is used for communication between client and server.

The onreadystatechange, readyState, status and statusText properties are used in ajax http response.

Ajax object properties

Property Description
onreadystatechange It defines a function to be called when the readyState property changes
readyState It holds the status of the XMLHttpRequest.

XMLHttpRequest Status:
0: request not initialized
1: server connection established
2: request received
3: processing request
4: request finished and response is ready

responseText It returns the response data as a string.
responseXML It returns the response data as XML data.
status It returns the status-number of a request. For example:
200: “OK”
403: “Forbidden”
404: “Not Found”
statusText It returns the status-text (For example “OK” or “Not Found”).



<!DOCTYPE html>
<div id="test">
<h2> Ajax http response</h2>
<button type="button" onclick="loadDocument()">Change Content</button>
function loadDocument() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("test").innerHTML =
  };"GET", "test.txt", true);


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