XSLT <xsl:choose> Element
Definition and usage
The <xsl:choose> element, in conjunction with the <xsl:when> and <xsl:otherwise> elements, can express multiple conditional tests.
If the <xsl:when> is not true, then process the content of <xsl:otherwise>.
If no <xsl:when> is true, and there is no <xsl:otherwise> element, no content will be created.
Tip:For simple conditional tests, use the <xsl:if> element instead.
Syntax
<xsl:choose> <!-- Content:(xsl:when+,xsl:otherwise?) --> </xsl:choose>
Attribute
None
Instance
Example 1
The following code will add a pink background color to the artist column when the CD price 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
Declare a variable named "color". Assign the value of this variable to the color attribute of the current element. If the current element does not have a color attribute, the value of color is "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>
