<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (xhttp.readyState == 4 && xhttp.status == 200) {
myFunction(xhttp);
}
};
xhttp.open("GET", "books.xml", true);
xhttp.send();
function myFunction(xml) {
var xmlDoc = xml.responseXML;
var x = get_previousSibling(xmlDoc.getElementsByTagName("price")[0]);
document.getElementById("demo").innerHTML = x.nodeName;
}
function get_previousSibling(n) {
var y = n.previousSibling;
//check if the node is an element node
while (y.nodeType != 1) {
y = y.previousSibling;
}
return y;
}
</script>
</body>
</html>