XSL Conditional processing

The xsl:if instruction do enables the conditional processing. The Stylesheet 1 demonstrates the typical case of a xsl:for-each usage, adding up the text between the individual entries. Often you do not want to add up the text after a last element. the xsl-if construct comes handy here. (see to Stylesheet 2)

XML source

<?xml version="1.0"?>
<xslTutorial >
<list>
<entry name="A"/>
<entry name="B"/>
<entry name="C"/>
<entry name="D"/>
</list>
</xslTutorial>

HTML output 1

<HTML>
<HEAD> </HEAD>
<BODY> A, B, C, D,
</BODY>
</HTML>

HTML output 2

<HTML>
<HEAD> </HEAD>
<BODY> A, B, C, D
</BODY>
</HTML>

XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' >
<xsl:template match="list">
<xsl:for-each select="entry">
<xsl:value-of select="@name"/>
<xsl:text> , </xsl:text>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>

XSL stylesheet 2

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="list">
<xsl:for-each select="entry">
<xsl:value-of select="@name"/>
<xsl:if test="not(position()=last())">
<xsl:text> , </xsl:text>
</xsl:if>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>

The Choose Element

The xsl:choose element is used for the purpose of selection between the several possibilities.

XML source

<?xml version="1.0"?>
<xslTutorial >
<SECTION>
<DATA>I need a pen.</DATA>
<DATA>I need some paper.</DATA>
<SUMMARY>I need a pen and some paper</SUMMARY>
</SECTION>
<SECTION>
<DATA>I need bread.</DATA>
<DATA>I need butter.</DATA>
</SECTION>
</xslTutorial>

HTML output 1

<HTML>
<HEAD> </HEAD>
<BODY>
<P>SUMMARY: I need a pen and some paper</P>
<P>DATA: I need bread.</P>
<P>DATA: I need butter.</P>
</BODY>
</HTML>

XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' > <xsl:template match="//SECTION">
<xsl:choose>
<xsl:when test='SUMMARY'>
<P><xsl:text> SUMMARY: </xsl:text>
<xsl:value-of select="SUMMARY"/></P>
</xsl:when>
<xsl:otherwise>
<xsl:for-each select="DATA">
<P><xsl:text> DATA: </xsl:text>
<xsl:value-of select="."/></P>
</xsl:for-each>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>

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