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Click on a CD to display album information.

// create XMLHttpRequest function
const xhttp = new XMLHttpRequest();
let cd;
xhttp.onload = function() {
 const xmlDoc = xhttp.responseXML; 
 cd = xmlDoc.getElementsByTagName("CD");
 loadCD();
}

// define the XMLHttpRequest Object
xhttp.open("GET", "cd_catalog.xml");
xhttp.send();

// display the CD list in a table
function loadCD() {
  let table="<tr><th>Artist</th><th>Title</th></tr>";
  for (let i = 0; i < cd.length; i++) { 
    table += "<tr onclick='displayCD(" + i + ")'><td>";
    table += cd[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue;
    table += "</td><td>";
    table += cd[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue;
    table += "</td></tr>";
  }
  document.getElementById("demo").innerHTML = table;
}

// display information for specific CD
function displayCD(i) {
  document.getElementById("showCD").innerHTML =
  "Artist: " +
  cd[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue +
  "<br>Title: " +
  cd[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue +
  "<br>Year: " + 
  cd[i].getElementsByTagName("YEAR")[0].childNodes[0].nodeValue;
}