[Ajax] Una semplice classe ...

[whisher]

Ciao.

//Inspired by: [url]http://creativecommons.org/licenses/by-sa/2.0/[/url]
// and by Andr3a 
function XHConn(){
    var xmlhttp = null;
    var result= true;
    var browser = navigator.userAgent.toUpperCase();
    if(typeof(XMLHttpRequest) === "function" || typeof(XMLHttpRequest) === "object"){
            xmlhttp = new XMLHttpRequest();
    }
    else if(window.ActiveXObject && browser.indexOf("MSIE 4") < 0){
        if(browser.indexOf("MSIE 5") < 0){
            xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
        }
        else{
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    if (xmlhttp===null){result= false;}
    this.connect = function(sURL, sMethod, sVars, fnDone, fnError){
        sMethod = sMethod.toUpperCase();
        xmlhttp.open(sMethod, sURL, true);
        if (sMethod == "POST"){
            xmlhttp.setRequestHeader("Method", "POST "+sURL+" HTTP/1.1");
            xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
            xmlhttp.setRequestHeader('Content-Length', sVars.length);
        }
        xmlhttp.onreadystatechange = function(){
            if (xmlhttp.readyState == 4){
                if(xmlhttp.status == 200){
                    fnDone(xmlhttp);
                   }
                else{
                       fnError(xmlhttp);
                }
            }
        }
        xmlhttp.setRequestHeader("connection", "close");
        xmlhttp.send(sVars);
    }
    return result;
}
function yourCallback(xhr) {
  alert(xhr.responseText);
}
function errorHandler(xhr){
    alert("HTTP error: "+xhr.status);
}
xhr = new XHConn();
xhr1 = new XHConn();
xhr.connect('post.php', 'POST', "param=target_value", yourCallback, errorHandler);
xhr1.connect('get.htm', 'GET', "", yourCallback, errorHandler); 

Critiche suggerimenti e miglioramenti sono molto benvenuti