<xsl:if> Element
Allows simple conditional template fragments.
<xsl:if
test = boolean-Expression>
</xsl:if>
test特定格式，= 后是逻辑表达式
In this example, the names in a group of names are formatted as a comma-separated list.
XML File (names.xml)
<?xml version='1.0'?>
<?xml-stylesheet type="text/xsl" href="ifcomma.xsl" ?>
<namelist>
<name>Albert</name>
<name>Terrance</name>
<name>Will</name>
<name>Sylvia</name>
<name>Timothy</name>
<name>Gordon</name>
<name>James</name>
<name>Robert</name>
<name>Dan</name>
<name>Sasha</name>
</namelist>
XSLT File (ifcomma.xsl)
<?xml version='1.0'?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
<xsl:template match="namelist/name">
<xsl:apply-templates/>
<xsl:if test="position()!=last()">, </xsl:if>
</xsl:template>
</xsl:stylesheet>
Output
This is the formatted output:
Albert, Terrance, Will, Sylvia, Timothy, Gordon, James, Robert, Dan, Sasha
This is the processor output:
<?xml version="1.0" encoding="UTF-16"?>Albert, Terrance, Will, Sylvia, Timothy, Gordon, James, Robert, Dan, Sasha
or using
<xsl:when> Element
Provides multiple conditional testing in conjunction with the <xsl:choose> and <xsl:otherwise> elements.
<xsl:when
test = boolean-Expression>
</xsl:when>
Attributes
test
Required. The condition in the source data to test. If the expression in this attribute evaluates to True when cast to a Boolean, the content of <xsl:when> is instantiated and placed in the output. Node-sets are cast to a Boolean True if they contain at least one node.
