Putting commas after each value in a loop except for the last one. Useful for JSON and the like

output-commas-except-for-last-item.xslt

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">

<!--
		Example of putting commas after everything but the last item in a list. 
		
		This will process the XML:
		
			<?xml version="1.0" encoding="UTF-8"?>
			<root>
				<item attKey="value1" />
				<item attKey="value2" />
				<item attKey="value3" />
				<item attKey="value4" />
			</root>
		
		And output:
		
			value1, value2, value3, value4
			
-->

	<xsl:output method="text"/>
	
	<xsl:template match="/root">
		
		<!-- Put commas after everything except the last one. -->
		<xsl:for-each select="item">
		
			<xsl:value-of select="@attKey"/>
			
			<xsl:if test="position()!=last()">
				<xsl:text>, </xsl:text>
			</xsl:if>
			
		</xsl:for-each>
		
	</xsl:template>

</xsl:stylesheet>