用.net 处理xmlHttp发送异步请求_ASP.NET技巧

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);