XML 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 <CD> element, and displays the values of the <ARTIST> and the <TITLE> elements in an HTML table:

Example

<html>
<head>
<style>
table, th, td {
border: 1px solid black;
  border-collapse:collapse;
}
th, td {
  padding: 5px;
}
</style>
</head>
<body>

<button type="button" onclick="loadXMLDoc()">Get my CD collection</button>
<br><br>
<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>

Try it Yourself »

For more information about using JavaScript and the XML DOM, go to DOM Intro.

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 +
    "<br>Title: " +
    x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue +
    "<br>Year: " +
    x[i].getElementsByTagName("YEAR")[0].childNodes[0].nodeValue;
}

Try it Yourself »

Navigate Between the CDs

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

Example

Try it Yourself »

Show Album Information When Clicking On a CD

The last example shows how you can display 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 +
    "<br>Title: " +
    x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue +
    "<br>Year: " +
    x[i].getElementsByTagName("YEAR")[0].childNodes[0].nodeValue;
}

Try it Yourself »

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