XSLT if

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XSLT <xsl:if> Element

We can put a conditional test against the content of the XML file, using the <xsl:if> element.

The <xsl:if> Element:

In the XSL document, we can add an <xsl:if> element, to put a conditional if test against the content of the XML file.

Syntax:

<xsl:if test="expression">
 ...Code if the expression is true...
</xsl:if>

Where to use the <xsl:if> Element:

In the XSL file, we need to add the <xsl:if> element inside the <xsl:for-each> element, to add a conditional test. The expression to be evaluated is included in the value of the required test attribute.

Example:

Books.xml:

<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
 
  <book category="Child">
    <title lang="en">ABC</title>
    <author>Author Name</author>
    <year>2020</year>
    <price>100.00</price>
  </book>
 
  <book category="IT">
    <title lang="en">XQuery Book</title>
    <author>Author 1</author>
    <author>Author 2</author>
    <year>2005</year>
    <price>300.00</price>
  </book>
 
  <book category="Sociology">
    <title lang="en">Sociology 1</title>
    <author>Author Name</author>
    <year>2015</year>
    <price>250.00</price>
  </book>
 
  <book category="GK">
    <title lang="en">Current Affairs</title>
    <author>Author Name</author>
    <year>2002</year>
    <price>500.00</price>
  </book>
 
  <book category="Science">
    <title lang="en">Science Book</title>
    <author>Author 1</author>
    <author>Author 2</author>
    <author>Author 3</author>
    <year>2019</year>
    <price>150.00</price>
  </book>
 
</bookstore>

XSLT Code:

<?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>List of Books</h2>
    <table border="1">
      <tr bgcolor="#9acd32">
      <th>Title</th>
      <th>Price</th>
      <th>Year</th>      
    </tr>
    <xsl:for-each select="bookstore/book">
    <xsl:if test="year>2005">
      <tr>
        <td><xsl:value-of select="title"/></td>
        <td><xsl:value-of select="price"/></td>
        <td><xsl:value-of select="year"/></td>        
      </tr>
    </xsl:if>
    </xsl:for-each>
    </table>
  </body>
  </html>
</xsl:template>
</xsl:stylesheet>

Output:

Explanation:

In the above example, only the title and price elements of the books with the year value higher than 2005 will be displayed.

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