XPath is a language used to search for information in XML documents. XPath can be used to traverse elements and attributes in XML documents.
XPath is a major element of the W3C XSLT standard, and both XQuery and XPointer are built on top of the XPath expression.
Therefore, understanding XPath is the foundation of many advanced XML applications.
1 Prepare xml file books.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="CHILDREN">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="WEB">
<title lang="en">XQuery Kick Start</title>
<author>James McGovern</author>
<author>Per Bothner</author>
<author>Kurt Cagle</author>
<author>James Linn</author>
<author>Vaidyanathan Nagarajan</author>
<year>2003</year>
<price>49.99</price>
</book>
<book category="WEB">
<title lang="en">Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>
2 Prepare HTML file XPathTest.html using XPath
<html>
<body>
<script type="text/javascript">
var xml = new ActiveXObject("Microsoft.XMLDOM")
xml.async = false
xml.load("books.xml")
path="/bookstore/book/title"
// code for IE
if (window.ActiveXObject)
{
var nodes=xml.selectNodes(path);
for (i=0;i<nodes.length;i++)
{
document.write(nodes[i].childNodes[0].nodeValue);
document.write("<br />");
}
}
</script>
</body>
</html>
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