Ajax Asynchronous Call Framework

ajax| Asynchronous /*
Author: welfred
Time: August 14, 05
Function: Ajax Asynchronous call framework
*/
var req;

Retrieve XML document (reusable generic function);
parameter is URL string (relative or complete) to
An. xml file whose content-type is a valid XML
Type, such as Text/xml; XML source must is from
Same domain as HTML file
function Ajax (URL) {

req = false;

Branch for native XMLHttpRequest object
if (window. XMLHttpRequest) {
try {
req = new XMLHttpRequest ();
catch (e) {
req = false;
}
Branch for ie/ Windows ActiveX version
else if (window. ActiveXObject) {
try {
req = new ActiveXObject ("Msxml2.xmlhttp");
catch (e) {
try {
req = new ActiveXObject ("Microsoft.XMLHTTP");
catch (e) {
req = false;
}
}
}
if (req) {
Req.onreadystatechange = Processreqchange; Once the state changed,the function "Processreqchange" would be excuted.
Req.open ("Get", url, True);
Req.send ();
}
}

/*wait for the response*/
function Processreqchange ()
{
Only if req shows "complete"
if (req.readystate = = 4) {
only if "OK"
if (Req.status = = 200) {
This is your bussiness code
Procbusiness ();
} else {
Alert ("Get the data!) \ n Please ensure that your Network The connection is smooth, otherwise, please contact the administrator in time, thank!:\ N "+ req.statustext);
}
}
}

/*
Read the XML file and retrive the data * *
function procbusiness () {
var xmlresult = Req.responsexml;
var root = xmlresult.documentelement;

Todo
}