[xep-support] "Filtered" Select and alternating background-color

Powell, Todd Todd.Powell at hq.doe.gov
Thu May 25 04:06:30 PDT 2006

Hi Martin,

Personally, I see "recursion solutions" as a kind of a workaround for
one of XSLT's shortcomings -- namely no traditional variables -- and
they make it difficult to understand what's going on in the script (if
not for the original developer, then for any subsequent support staff
trying to take over maintenance).

AND, if you ARE talking about a really huge table, and it causes your
transformation "to exlode" (nice imagery Geoff :-), then you can't use
it at all.

I'd suggest two alternatives:

1) If you are using a parser that supports javascript scripting as
callable functions from the XSL (Microsoft's is one), you could create a
"global" javascript variable that truly does get incremented during each
table row output, and whose value can be queried to determine odd/even;

2) Split your XSLT process into two distinct passes:  one which
sorts/filters/etc. the data into the desired order, and another which
operates on the result of the first and simply looks at the (position()
mod 2) to determine odd/even.

Each of these options have their downsides, and may prove undoable for
your situation, but I think they are more straightforward in their logic
than the recursive approach.

Hope this helps!


Todd S. Powell
Project Performance Corporation
Principal Analyst
U.S. Department of Energy

> David Pirkle schrieb:
>> You could try moving the body of your loop into a recursive template,
>> and then replace the for-each with a call to the template.  That 
>> would allow you to have a variable that increments for each element 
>> that passes the filter, and you could use the modulus test on that.
>> -----Original Message-----
>> Martin Snajdr|AMAN
>> Sent: Tuesday, May 23, 2006 1:16 AM
>> To: xep-support at renderx.com
>> Subject: [xep-support] "Filtered" Select and alternating
>> background-color
>> Hi there,
>> i have a problem with a real huge table, which has to have
>> alternating background-color in each table-row.
>> As you can see in the following excerpt, i have to use a xsl:if to 
>> filter the select. But doing it this way prevents the 
>> position()-thing from working right, when the filter is active.
>> [..]
>> <fo:table-body>
>> <xsl:for-each select="article">
>> 	<xsl:if test="(($filter_material='all') or
>> and
>> @color=$filter_material))
>> 				and (($filter_knaggen='all') or
($filter_knaggen!='all' and 
>> contains(./attributevalue[@attid=$filter_knaggen_attrid]/value[@lang=
>> '
>> de'],$filter_knaggen)
>> ))
>> 				and (($filter_nenngroesse='all') or
>> and
>> ng='de'],$filter_nenngroesse)
>> ))
>> 				and (($filter_eingang='all') or
($filter_eingang!='all' and
>> de'],$filter_eingang)
>> ))
>> 				">
>> 	<fo:table-row page-break-inside="avoid">
>> 	<xsl:attribute name="background-color"><xsl:if test="position()
>> 2=0">rgb-icc(255,255,255,#CMYK,0,0,0,0)</xsl:if><xsl:if
>> test="position() mod 2 != 0">rgb-icc(227, 231,
>> 241,#CMYK,0.1,0.045,0,0.05)</xsl:if></xsl:attribute>
>> [..]
>> I tried to change the select to do the filtering, but since the
>> filter depends on passed-in params i'm not able to do this. I tried 
>> some exslt node-set-stuff, but i didn't get to it.
>> Anyone any idea?

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