AJAX - The Complete Reference

62 Part I: Core Ideas

Browser Native ActiveX

Mozilla 1+ Yes No

Netscape 7+ Yes No

Internet Explorer 5 No Yes

Internet Explorer 5.5 No Yes

Internet Explorer 6 No Yes

Internet Explorer 7 Yes Yes

Opera 8+ Yes No

Safari 1.2+ Yes No

TABLE 3-1 XMLHttpRequest Object Support by Browser

Property or Method Description

readyState Integer indicating the state of the request, either:

0 (uninitialized)

1 (loading)

2 (response headers received)

3 (some response body received)

4 (request complete)

onreadystatechange Function to call whenever the readyState changes

status HTTP status code returned by the ser ver

(e.g., “200, 404, etc.”)

statusText Full status HTTP status line returned by the ser ver (e.g.,

“OK, No Content, etc.”)

responseText Full response from the ser ver as a string

responseXML A Document object representing the ser ver’s response

parsed as an XML document

abort() Cancels an asynchronous HTTP request

getAllResponseHeaders() Returns a string containing all the HTTP headers the ser ver

sent in its response. Each header is a name/value pair

separated by a colon and header lines are separated by a

carriage return/linefeed pair

getResponseHeader(header

Name)

Returns a string corresponding to the value of the

headerName header returned by the ser ver

(e.g., request.getResponseHeader("Set-cookie")

TABLE 3-2 Common Properties and Methods of the XMLHttpRequest Object