How to add all comma separated values in XSLT - xslt

Question

I have a question in XSLT.
I have one variable, suppose :
<xsl:variable name="myVar" select="string('1.3,2.1,3.3,5.1,11.4')">
I want to add all comma separated values.
This is my current code, where I am trying to sum up all csv values which are stored in $sum variable.
<xsl:template name="getCount" >
<xsl:param name="str" /> <!-- $str is having '0.001,0.003' value -->
<xsl:param name="delimiter" />
<xsl:param name="summation" />
<xsl:choose>
<xsl:when test="contains(string($str),string($delimiter))">
<xsl:variable name="beforecomma" select="substring-before(string($str),string($delimiter))" />
<xsl:variable name="aftercomma" select="substring-after(string($str),string($delimiter))" />
<xsl:choose>
<xsl:when test="$aftercomma=''">
<xsl:value-of select="$summation + $beforecomma" />
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="getindexvalue">
<xsl:with-param name="str" select="$aftercomma" />
<xsl:with-param name="delimiter" select="string($delimiter)" />
<xsl:with-param name="summation" select="$summation + beforecomma" />
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
</xsl:choose>
</xsl:template>

Answer 1

Assuming that the call-template is a typo and should be a recursive call to the same template
<xsl:call-template name="getCount">
then you're actually very very close to a working solution. The error is in
<xsl:with-param name="summation" select="$summation + beforecomma" />
where you're missing a $ in front of beforecomma:
<xsl:with-param name="summation" select="$summation + $beforecomma" />
Without the dollar you're looking for a child element named beforecomma rather than taking the value of the variable.
A few other comments:
you have a lot of redundant string() calls, you could simply say e.g. contains($str,$delimiter) instead of contains(string($str),string($delimiter)), as the functions you're using automatically coerce their arguments to string.
your current code requires at least two comma-separated values, it can't cope with being given just one value (for which the sum would just be the value itself). Structuring your template to cope with this would actually make it simpler:
<xsl:template name="getCount" >
<xsl:param name="str" /> <!-- $str is having '0.001,0.003' value -->
<xsl:param name="delimiter" />
<xsl:param name="summation" select="0" />
<xsl:choose>
<xsl:when test="contains($str,$delimiter)">
<xsl:variable name="beforecomma" select="substring-before($str,$delimiter)" />
<xsl:variable name="aftercomma" select="substring-after($str,$delimiter)" />
<xsl:call-template name="getCount">
<xsl:with-param name="str" select="$aftercomma" />
<xsl:with-param name="delimiter" select="$delimiter" />
<xsl:with-param name="summation" select="$summation + $beforecomma" />
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$summation + $str" />
</xsl:otherwise>
</xsl:choose>
</xsl:template>