XSLT <xsl:when>
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Definition and Usage
The <xsl:when> element is used to specify an action for the <xsl:choose> element. The <xsl:when> element evaluates an expression, and if it returns true, an action is performed.
Note: The <xsl:when> element is used in conjunction with <xsl:choose> and <xsl:otherwise> to express multiple conditional tests.
Syntax
<xsl:when
test="boolean-expression">
<!-- Content: template -->
</xsl:when>
Attributes
| Attribute | Value | Description |
|---|---|---|
| test | boolean-expression | Required. Specifies a Boolean expression to be tested |
Example 1
The code below will add a pink background-color to the artist column WHEN the price of the cd is higher than 10.
<?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>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, and View the result.
Example 2
Declare a variable named "color". Set its value to the color attribute of the current element. If the current element has no 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>
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