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我们要达到的目的是点击按钮，获得服务器的当前时间，ASPx的HTML如下：
HTML
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Linkedu.Web.WebWWW.Default" %>
要用JavaScript 发送XMLHttp 请求必须解决的问题是跨浏览器的支持。我们把XMLHttp的发送封装在一个JavaScript对象中，同时在这个对象中解决了跨浏览器支持的问题。代码如下：
XMLHttp对象
/**//*
url-loading object and a request queue built on top of it
*/
/**//* namespacing object */
var net=new Object();
net.READY_STATE_UNINITIALIZED=0;
net.READY_STATE_LOADING=1;
net.READY_STATE_LOADED=2;
net.READY_STATE_INTERACTIVE=3;
net.READY_STATE_COMPLETE=4;
/**//*--- content loader object for cross-browser requests ---*/
net.XMLHttp=function(url, onload, params, method, contentType, onerror){
this.req=null;
this.onload=onload;
this.onerror=(onerror) ? onerror : this.defaultError;
if(typeof(method) == "undefined" || method == null)
{
method = "POST";
}
this.loadXMLDoc(url, params, method, contentType);
}
net.XMLHttp.prototype.loadXMLDoc=function(url, params, method, contentType){
if (!method){
method="GET";
}
if (!contentType && method=="POST"){
contentType='application/x-www-form-urlencoded';
}
if (window.XMLHttpRequest){
this.req=new XMLHttpRequest();
} else if (window.ActiveXObject){
this.req=new ActiveXObject("Microsoft.XMLHttp");
}
if (this.req){
try{
var loader=this;
this.req.onreadystatechange=function(){
net.XMLHttp.onReadyState.call(loader);
}
this.req.open(method,url,true);
if (contentType){
this.req.setRequestHeader('Content-Type', contentType);
}
this.req.send(params);
}catch (err){
this.onerror.call(this);
}
}
}
net.XMLHttp.onReadyState=function(){
var req=this.req;
var ready=req.readyState;
if (ready==net.READY_STATE_COMPLETE){
var httpStatus=req.status;
if (httpStatus==200 || httpStatus==0){
this.onload.call(this);
}else{
this.onerror.call(this);
}
}
}
net.XMLHttp.prototype.defaultError=function(){
alert("error fetching data!"
+"\n\nreadyState:"+this.req.readyState
+"\nstatus: "+this.req.status
+"\nheaders: "+this.req.getAllResponseHeaders());
}
下面开始写发送XMLHttp请求的代码：
default.js
//全局XMLHttp对象
var cobj;
/**//* Post begin*/
//绑定Post发送XMLHttp事件到btnTestPost
function loadTestPost()
{
var iobj = document.getElementById("btnTestPost");
//btnTestPost按钮监听的绑定
var clickRouter=new jsEvent.EventRouter(iobj,"onclick");
clickRouter.addListener(btnTestPostClick);
}
function btnTestPostClick()
{ // open参数 url, onload, params, method, contentType, onerror
cobj = new net.xmlHttp("DefaultHandler.ashx",dealResult, "
}
/**//* Post end*/
/**//* Get begin*/
//绑定Get发送XMLHttp事件到btnTestGet
function loadTestGet()
{
var iobj = document.getElementById("btnTestGet");
//btnTestGet按钮监听的绑定
var clickRouter=new jsEvent.EventRouter(iobj,"onclick");
clickRouter.addListener(btnTestGetClick);
}
function btnTestGetClick()
{ // open参数 url, onload, params, method, contentType, onerror
cobj = new net.XMLHttp("DefaultHandler.ashx?T=1",dealResult, null, "GET");
}
/**//* Get end*/
function dealResult()
{
var dobj = document.getElementById("divResult");
dobj.innerHTML = cobj.req.responseXML.text;
}
window.onload = function()
{
//绑定Post发送XMLHttp事件到btnTestPost
loadTestPost();
//绑定Get发送XMLHttp事件到btnTestGet
loadTestGet();
};
最后是.net处理XMLHttp的代码
.net 处理XMLHttp请求
public class DefaultHandler : IHttpHandler
{
protected XMLDocument _XMLResult;
public void ProcessRequest(HttpContext context)
{
if (context.Request["T"] != null)
{//GET XMLhttp测试
context.Response.ContentType = "text/XML";
XMLDocument XMLDoc = new XMLDocument();
xmlDoc.LoadXml(string.Format(@"", System.DateTime.Now));
XMLDoc.Save(context.Response.OutputStream);
context.Response.End();
}
else
{//POST XMLhttp测试
context.Response.ContentType = "text/XML";
XMLDocument XMLDoc = new XMLDocument();
XMLDoc.Load(context.Request.InputStream);
if (XMLDoc.DocumentElement.Name == "T")
{
xmlDoc.LoadXml(string.Format(@"", System.DateTime.Now));
XMLDoc.Save(context.Response.OutputStream);
context.Response.End();
}
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
http://www.cnblogs.com/Files/laiwen/XMLHttpNet.rar
http://www.cnblogs.com/laiwen/archive/2006/12/26/604050.HTML
做人要厚道，请注明转自酷网动力(www.ASPCOOL.COM)。