How to create Cross Domain XMLHTTPRequests in Internet Explorer

Question

My code looks like this, which is recommended for IE to work, but it only works in Chrome and FF. Is there a correct way to access a url from another domain. Furthermore, the domain is a domain I own and can allow access to the scripts trying to access it:

<script language="javascript" type="text/javascript">
function sendRequest(url,callback,postData) {
    var req = createXMLHTTPObject();
    if (!req) return;
    var method = (postData) ? "POST" : "GET";
    req.open(method,url,true);
    req.setRequestHeader('User-Agent','XMLHTTP/1.0');
    if (postData)
        req.setRequestHeader('Content-type','application/x-www-form-urlencoded');
    req.onreadystatechange = function () {
        if (req.readyState != 4) return;
        if (req.status != 200 && req.status != 304) {
//          alert('HTTP error ' + req.status);
            return;
        }
        callback(req);
    }
    if (req.readyState == 4) return;
    req.send(postData);
}

var XMLHttpFactories = [
    function () {return new XMLHttpRequest()},
    function () {return new ActiveXObject("Msxml2.XMLHTTP")},
    function () {return new ActiveXObject("Msxml3.XMLHTTP")},
    function () {return new ActiveXObject("Microsoft.XMLHTTP")}
];

function createXMLHTTPObject() {
    var xmlhttp = false;
    for (var i=0;i<XMLHttpFactories.length;i++) {
        try {
            xmlhttp = XMLHttpFactories[i]();
        }
        catch (e) {
            continue;
        }
        break;
    }
    return xmlhttp;
}

function handleRequest(req) {
    var MyResponse = req.responseText;
    document.open();
    document.write(MyResponse);
    document.close();
}

 sendRequest("http://anotherdomain.com/urlwithcontentneeded.php",handleRequest);


</script>

Answer 1

IE does not suppoort cross domain requests in this way but does have a way using the XDomainRequest object instead, see http://msdn.microsoft.com/en-us/library/cc288060(v=vs.85).aspx

It works in much the same way though, and yes it's a pain there are two ways to do it in different browsers