How to use the XMLHttpRequest?

■ Summary
- The following code snippet demonstrates how to use the XMLHttpRequest.

■ Reference Sites
- http://www.w3schools.com/xml/dom_httprequest.asp 
var xmlhttp, xmlDoc, dataItem;

xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET", XML_ADDRESS, false);

xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState === 4) {
        if (xmlhttp.status === 200) {
            xmlDoc = xmlhttp.responseXML;
            dataItem = xmlDoc.getElementsByTagName('item');
            if (dataItem.length > 0) {
               // TODO
            } 
            xmlhttp = null;
        }
    }
};

xmlhttp.send();
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