On 6/7/07, Mark Anderson <mark(_dot_)anderson(_at_)technique-group(_dot_)com>
wrote:
Hi All
I have to process an XML file that contains a lot of numeric data. Many of the
elements that have no value are empty instead of being zero and it may differ
for each line, for example
<line id=1>
<cost1>1000</cost1>
<cost2>0</cost2> <!-- 0 here, but empty in next line -->
<cost3></cost3>
</line>
<line id=2>
<cost1>2000</cost1>
<cost2></cost2>
<cost3>3000</cost3>
</line>
I want to do:
<xsl:for-each select="line">
<xsl:value-of select="format-number(cost1 + cost2 + cost3,'#,###')"/>
</xsl:for-each>
However, the empty elements will cause "NaN" to be displayed
To fix it I can do:
<xsl:for-each select="line">
<xsl:variable name="cost1">
<xsl:choose>
<xsl:when test="(cost1 >= 0)"><xsl:value-of select="cost1"/></xsl:when>
<xsl:otherwise>0</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="cost2">
<xsl:choose>
<xsl:when test="(cost2 >= 0)"><xsl:value-of select="cost2"/></xsl:when>
<xsl:otherwise>0</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="cost3">
<xsl:choose>
<xsl:when test="(cost3 >= 0)"><xsl:value-of select="cost3"/></xsl:when>
<xsl:otherwise>0</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:value-of select="format-number($cost1 + $cost2 + $cost3,'#,###')"/>
</xsl:for-each>
However, it seems very long winded. Also the output is HTML, so it makes it
hard to read the HTML with so much XML interwoven.
I realized I could write a template to return 0 for each empty element, but the
call-template and parameter declaration will add further lines.
Is there a more succinct/elegant way to do it? (it's a shame "number(cost1)"
doesn't return 0 for empty elements)
BTW: I'm using XSLT1.0 and can't use any extensions
hmmm it's a bit hacky but you can do:
<xsl:variable name="zero">0</xsl:variable>
<xsl:value-of select="(cost1/text()|$zero)[1] +
(cost2/text()|$zero)[1] + (cost3/text()|$zero)[1]"/>
hopefully someone else will have a better idea...
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