Ajax Learning Notes (ii)

Today I saw the attributes of XMLHttpRequest:

onReadyStateChange

This event is triggered when the state is changed, and JavaScript functions are usually invoked.

Status has 5 values: 0: Uninitialized.　 1: Loading.　　2: Already loaded.　 3: the interaction. 4: Finished.

ResponseTest

The response of the server, expressed as a string.

Responsexml

The response of the server, expressed as XML

Status

The status number of the server HTTP (200 corresponds to ok,404 is not found.) There are a lot of people who can go on

NET look for ... ................

Statustest

The status text of the server HTTP (ok,not Found. There are a lot of people can surf the internet to find

Have a look for ...............

=============================================================================

=

A simple example:

The client triggers an AJAX event.

<input type= "text" id= "email" name= "Send Mail" onblur= "Validateemail ()";>

=========================================================

Here is the Validateemail function:

var xmlHttp;
function Validataemail ()
{
var Email=document.getelemenbyid ("email");
var url= "validate?email=" + Escape (email.value);
if (window. ActiveXObject)
{
Xmlhttp=new ActiveXObject ("Microsoft.XMLHTTP");
}
else if (window. XMLHttpRequest)
{
Xmlhttp=new XMLHttpRequest
}
Xmlhttp.open ("get", url);
Xmlhttp.onreadystatechange=callback;
Xmlhttp.send (NULL);
}
'***********************************************************************/
' * Function Name:callback *
' * Input Arguments: * *
' * Out Arguments: * *
'* :　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 　*/
' * Description: Check the ReadyState property of the XMLHttpRequest to see the status code returned by the server. */
' * Author: * *
' * date:2006-11-30 *
'***********************************************************************/
　　
function callback ()
　　
{
　　
if (xmlhttp.readystate==4)
　　
{
　　
if (xmlhttp.status==200)
　　
{
　　
Do what you want to do.
　　
}
　　
}
　　
}