strophe.xdomainrequest.js

Strophe.addConnectionPlugin("xdomainrequest", {
    init: function() {
        if (window.XDomainRequest) {
            Strophe.debug("using XdomainRequest for IE");

            // override thee send method to fire readystate 2
            XDomainRequest.prototype.send = (function(oldSend) {
                return function() {
                    oldsend.apply(this, arguments);
                    this.readyState = 2;
                    try {
                        this.onreadystatechange();
                    } catch(e) {}
                };
            })(XDomainRequest.prototype.send);

            // replace Strophe.Request._newXHR with the xdomainrequest version
            Strophe.Request.prototype._newXHR = function() {
                var fireReadyStateChange = function(xhr, status) {
                    xhr.status = status;
                    xhr.readyState = 4;
                    try {
                        xhr.onreadystatechange();
                    } catch(e) {}
                };
                var xhr = new XDomainRequest();

                xhr.readyState = 0;
                xhr.onreadystatechange = this.func.prependArg(this);
                xhr.onload = function() {
                    xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
                    xmlDoc.async = "false";
                    xmlDoc.loadXML(xhr.responseText);
                    xhr.responseXML = xmlDoc;
                    fireReadyStateChange(xhr, 200);
                };
                xhr.onerror = function() {
                    fireReadyStateChange(xhr, 500);
                };
                xhr.ontimeout = function() {
                    fireReadyStateChange(xhr, 500);
                };
                return xhr;
            }

        } else {
            Strophe.error("XDomainRequest not found. Falling back to native XHR implementation.");
        }
    }
});