XML Applications
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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>
<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>
var x = xmlDoc.getElementsByTagName("
for (i = 0; i <x.length; i++) {
table += "<tr><td>" +
x[i].getElementsByTagName("
"</td><td>" +
x[i].getElementsByTagName("
"</td></tr>";
}
document.getElementById("demo"
}
</script>
</body>
</html>
»
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("
document.getElementById("
"Artist: " +
x[i].getElementsByTagName("
"<br>Title: " +
x[i].getElementsByTagName("
"<br>Year: " +
x[i].getElementsByTagName("
}
»
Navigate Between the CDs
To navigate between the CDs, in the example above, add a next() and previous() function:
Example
function next() {
// display the next CD, unless you are on the last CD
if (i < x.length-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:
.
❮ Previous Next ❯
❮ Previous Next ❯
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>
<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>
var x = xmlDoc.getElementsByTagName("
for (i = 0; i <x.length; i++) {
table += "<tr><td>" +
x[i].getElementsByTagName("
"</td><td>" +
x[i].getElementsByTagName("
"</td></tr>";
}
document.getElementById("demo"
}
</script>
</body>
</html>
»
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("
document.getElementById("
"Artist: " +
x[i].getElementsByTagName("
"<br>Title: " +
x[i].getElementsByTagName("
"<br>Year: " +
x[i].getElementsByTagName("
}
»
Navigate Between the CDs
To navigate between the CDs, in the example above, add a next() and previous() function:
Example
function next() {
// display the next CD, unless you are on the last CD
if (i < x.length-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:
.
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