XSLT <xsl:when> Element

XSLT Elements

Definition and Usage

The <xsl:when> element is used to specify related actions for the <xsl:choose> element.

The <xsl:when> element evaluates an expression and performs the specified action if it returns true.

Comments:The <xsl:when> element provides multiple conditional tests related to the <xsl:choose> and <xsl:otherwise> elements.

Syntax

<xsl:when test="boolean-expression">
  <!-- Content: template -->
</xsl:when>

Attribute

Attribute Value Description
test boolean-expression Required. Specifies the boolean expression to be tested.

Instance

Example 1

The following code will add a pink background color to the artist column when the price of cd is higher than 10:

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
  <html>
  <body>
    <h2>My CD Collection</h2>
    <table border="1">
      <tr bgcolor="#9acd32">
        <th>Title</th>
        <th>Artist</th>
      </tr>
      <xsl:for-each select="catalog/cd">
      <tr>
        <td><xsl:value-of select="title"/></td>
      	<xsl:choose>
          <xsl:when test="price>'10'">
            <td bgcolor="#ff00ff">
            <xsl:value-of select="artist"/></td>
          </xsl:when>
          <xsl:otherwise>
            <td><xsl:value-of select="artist"/></td>
          </xsl:otherwise>
        </xsl:choose>
      </tr>
      </xsl:for-each>
    </table>
  </body>
  </html>
</xsl:template>
</xsl:stylesheet>

View the XML file,View the XSL file,View the result.

Example 2

A variable named "color" was declared. Its value is assigned to the color attribute of the current element. If the current element does not have a color attribute, the value of "color" will be "green":

<xsl:variable name="color">
  <xsl:choose>
    <xsl:when test="@color">
      <xsl:value-of select="@color"/>
    </xsl:when>
    <xsl:otherwise>green</xsl:otherwise>
  </xsl:choose>
</xsl:variable>

XSLT Elements