XMLHttpRequest example

XMLHttpRequest_example.js

var httpRequest;
if (window.XMLHttpRequest) {
    httpRequest = new XMLHttpRequest();
} else if (window.ActiveXObject) {
    // Internet Explorer
    httpRequest = new
    ActiveXObject("Microsoft.XMLHTTP");
}
httpRequest.onreadystatechange = function () {
    if (httpRequest.readyState === 4 && httpRequest.status === 200) {
        callback.call(httpRequest.responseXML);
    }
};

httpRequest.open('GET', url);
httpRequest.send();