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