---
title: AJAX Applications
description: "> This chapter demonstrates some HTML applications using XML, HTTP, DOM, and JavaScript. ## The XML Document Used In this chapter we will use the XML file called “cd_catalog.xml”. ## Display XML Data in an HTML Table This example loops through…"
url: "https://apprentice.mn/docs/ajax-applications/"
updated: "2021-05-19"
category: Javascript
---

# AJAX Applications

> This chapter demonstrates some HTML applications using XML, HTTP, DOM, and JavaScript.

## The XML Document Used

In this chapter we will use the XML file called “cd_catalog.xml”.

## Display XML Data in an HTML Table

This example loops through each element, and displays the values of the and the

### Example

     `<html>
<head>
<style>
table, th, td {
  border: 1px solid black;
  border-collapse: collapse;
}

th, td {
  padding: 5px;
}
</style>
</head>
<body>

<table id="demo"></table>

<script>
function loadXMLDoc() {
  var xmlhttp = new XMLHttpRequest();
  xmlhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      myFunction(this);
    }
  };
  xmlhttp.open("GET", "cd_catalog.xml", true);
  xmlhttp.send();
}
function myFunction(xml) {
  var i;
  var xmlDoc = xml.responseXML;
  var table="<tr><th>Artist</th><th>Title</th></tr>";
  var x = xmlDoc.getElementsByTagName("CD");
  for (i = 0; i <x.length; i++) {
    table += "<tr><td>" +
    x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue +
    "</td><td>" +
    x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue +
    "</td></tr>";
  }
  document.getElementById("demo").innerHTML = table;
}
</script>

</body>
</html>`

## Display the First CD in an HTML div Element

This example uses a function to display the first CD element in an HTML element with id=”showCD”:

### Example

              `displayCD(0);

function displayCD(i) {
  var xmlhttp = new XMLHttpRequest();
  xmlhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      myFunction(this, i);
    }
  };
  xmlhttp.open("GET", "cd_catalog.xml", true);
  xmlhttp.send();
}

function myFunction(xml, i) {
  var xmlDoc = xml.responseXML;
  x = xmlDoc.getElementsByTagName("CD");
  document.getElementById("showCD").innerHTML =
  "Artist: " +
  x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue +
  "Title: " +
  x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue +
  "Year: " +
  x[i].getElementsByTagName("YEAR")[0].childNodes[0].nodeValue;
}`

## Navigate Between the CDs

To navigate between the CDs in the example above, create a `next()` and `previous()` function:

### Example

      `function next() {
  // display the next CD, unless you are on the last CD
  if (i < len-1) {
    i++;
    displayCD(i);
  }
}

function previous() {
  // display the previous CD, unless you are on the first CD
  if (i > 0) {
    i--;
    displayCD(i);
  }
}`

## Show Album Information When Clicking On a CD

The last example shows how you can show album information when the user clicks on a CD:

### Example

              `function displayCD(i) {
  document.getElementById("showCD").innerHTML =
  "Artist: " +
  x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue +
  "Title: " +
  x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue +
  "Year: " +
  x[i].getElementsByTagName("YEAR")[0].childNodes[0].nodeValue;
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