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XSLT <xsl:if> Element

How to use the XSLT <xsl:if> element to conditionally display XML data based on boolean expressions in your transformations.

The <xsl:if> element is used to put a conditional test against the contents of the XML file.

<xsl:if> Element

Syntax

The syntax of <xsl:if> is as follows:

<xsl:if test=boolean-expression> 
	... data displayed if expression is true ... 
</xsl:if>

Attributes

The table describes the meaning of the attributes of <xsl:if>:

Name Description
test The condition in the xml data to test.

Example

Let's see an example:

books.xmlxml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="books.xsl"?>

<bookstore>
	<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 Tips</title>
		<author>Tom Nolan</author>
		<year>2022</year>
		<price>39.99</price>
	</book>
	<book category="web">
		<title lang="en">Learn XML</title>
		<author>Tutorial Reference</author>
		<year>2022</year>
		<price>9.99</price>
	</book>
</bookstore>
books.xslxml
<?xml version="1.0" encoding="UTF-8"?>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">
	<html>
		<body>
			<h2>The Bookstore</h2>
			<table border="1">
				<tr bgcolor="#6565d5">
					<th>Title</th>
					<th>Author</th>
					<th>Year</th>
					<th>Price</th>
				</tr>  
				<xsl:for-each select="bookstore/book">
					<xsl:if test="price &gt; 15">
						<tr>
							<td><xsl:value-of select="title"/></td>
							<td><xsl:value-of select="author"/></td>
							<td><xsl:value-of select="year"/></td>
							<td><xsl:value-of select="price"/></td>
						</tr>
					</xsl:if>
				</xsl:for-each>
			</table>
		</body>
	</html>
</xsl:template>

</xsl:stylesheet>
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