Ajax Request & Handler using just Javascript & JSfiddle

var aRequest;
 
//Makes an AJAX request & checks which request current broswer supports.
if (window.XMLHttpRequest){
aRequest = new XMLHttpRequest();
}
else if (window.ActiveXObject){
aRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
 
//Deals with the request
aRequest.onreadystatechange = function(){
//if request has completely finished.
if (aRequest.readyState === 4 && xmlhttp.status===200){
//code for whatever you want to do with the data goes here.
var requestedData = innerHTML=xmlhttp.responseText;
console.log("Data:" + requestedData);
}
 
};
 
//change this to desired path. it can be xml, html, etc. this is for testing ajax in JSfiddle.
aRequest.open("POST", "/echo/html/", true);
 
//no, we do not need to send data back.
aRequest.send();