XML DOM Traverse Node Tree
Traversing means looping through or traveling across the node
tree.
Examples
The examples below use the XML file
books.xml.
A function, loadXMLString(), in an external JavaScript is used to load the XML
string.
Traverse a
node tree
Loop through all child nodes of the <book> element
Traversing the Node Tree
Often you want to loop an XML document, for example: when you want to extract
the value of each element.
This is called "Traversing the node tree"
The example below loops through all child nodes of <book>, and
displays their names and values:
<html>
<head>
<script type="text/javascript" src="loadxmlstring.js"></script>
</head>
<body>
<script type="text/javascript">
text="<book>";
text=text+"<title>Everyday Italian</title>";
text=text+"<author>Giada De Laurentiis</author>";
text=text+"<year>2005</year>";
text=text+"</book>";
xmlDoc=loadXMLString(text);
// documentElement always represents the root node
x=xmlDoc.documentElement.childNodes;
for (i=0;i<x.length;i++)
{
document.write(x[i].nodeName);
document.write(": ");
document.write(x[i].childNodes[0].nodeValue);
document.write("<br />");
}
</script>
</body>
</html>
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Output:
title: Everyday Italian
author: Giada De Laurentiis
year: 2005
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Example explained:
- loadXMLString() loads the XML string into xmlDoc
- Get the child nodes of the root element
- For each child node, output the node name and the node value of the text
node
Try it
yourself
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