<xsl:choose> Element

發行項
12/06/2006

Tests multiple conditions in conjunction with the <xsl:otherwise> and <xsl:when> elements.

<xsl:choose>
</xsl:choose>

Element Information

Number of occurrences	Unlimited
Parent elements	xsl:attribute, xsl:comment, xsl:copy, xsl:element, xsl:fallback, xsl:for-each, xsl:if, xsl:message, xsl:otherwise, xsl:param, xsl:processing-instruction, xsl:template, xsl:variable, xsl:when, xsl:with-param, output elements
Child elements	xsl:otherwise, xsl:when

Remarks

The <xsl:when> children of the <xsl:choose> element are tested, in order from top to bottom, until a test attribute on one of these elements accurately describes conditions in the source data, or until an <xsl:otherwise> element is reached. Once an <xsl:when> or <xsl:otherwise> element is chosen, the <xsl:choose> block is exited. No explicit break or exit statement is required.

For simple conditional testing, use the <xsl:if> element.

Example

The following example shows a template for <order> elements, and inserts a size indicator before the contents of each <order>. This size indicator is based on the value of the <total> element within each <order> element. If the total is less than 10, the text "(small)" is added. If the total is less than 20, the text "(medium)" is added. If the total is 20 or more, the text "(large)" is added.

XML File (order.xml)

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="refchoose.xsl" ?>
<orders>
   <order>
      <lineitem/>
      <lineitem/>
      <total>9</total>
   </order>
   <order>
      <lineitem/>
      <lineitem/>
      <total>19</total>
   </order>
   <order>
      <lineitem/>
      <lineitem/>
      <total>29</total>
   </order>
</orders>

XSLT File (refchoose.xsl)

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

<xsl:template match="order">
   <xsl:choose>
      <xsl:when test="total &lt; 10">
         (small)
      </xsl:when>
      <xsl:when test="total &lt; 20">
         (medium)
      </xsl:when>
      <xsl:otherwise>
         (large)
      </xsl:otherwise>
   </xsl:choose>
   <xsl:apply-templates />
   <BR/>
</xsl:template>

</xsl:stylesheet>

Output

(small) 9

(medium) 19

(large) 29

共用方式為