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 [Forwarded on behalf of John Potter, who's having trouble posting to
the list]
-----------------------------------
Dynamic template select criteria; params & variables
OK - After searching around a bit more, I've figured out that you're not
allowed to create dynamic XPath expressions but that dynamic predicates are
allowed...
Can anyone tell me why (from the example I submitted earlier) this isn't
working for me (no error but I get back all items whether they match the
criteria or not.
***************************
<xsl:variable name="test" select="'contains($color_criteria, @color) and
contains($letter_criteria, @letter)'"/>
<xsl:apply-templates select="records/record[$test]"/>
***************************
Hardcoding the entire select clause works as I would think it should...
<xsl:apply-templates
select="records/record[contains($color_criteria, @color) and
contains($letter_criteria, @letter)]"/>
This has got to be a fairly routine task.
Thanks.
John Potter
-----Original Message-----
From: John Potter
Sent: Monday, August 19, 2002 2:09 PM
To: 'xsl-list@xxxxxxxxxxxxxxxx'
Subject: Dynamic template select criteria; params & variables
Hello:
I've been playing around with XSLT for the past couple months with good
results but have run into something that I'm having trouble getting around.
Essentially, I want to be able to pass in several values as parameters and
filter my output based on those values.
My initial thought was to create a variable, check the parameters one by one
and build the select criteria (specifically the predicates). The content of
that variable would get placed in the apply-templates statement (e.g.
<xsl:apply-template select="$main_select_clause"/>).
I've got two problems - building the contents of the variable (I know - it's
more like a constant) and then getting the apply-template to work w/ the
variable (even if I build a simple variable w/ hard-coded values).
Am I missing something obvious?
You'll find a simplified example of what I'm trying to accomplish below.
Thanks.
John Potter
****************************************************************
Parser Info
Vendor: Microsoft
Vendor URL: http://www.microsoft.com
****************************************************************
xml file
<?xml version="1.0"?>
<records>
<record num="1" letter="A" color="blue"/>
<record num="2" letter="B" color="blue"/>
<record num="3" letter="C" color="green"/>
<record num="4" letter="D" color="yellow"/>
</records>
****************************************************************
xslt file
<?xml version="1.0"?>
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html"/>
<xsl:param name="letter_criteria" select="'B'"/>
<xsl:param name="color_criteria" select="'blue'"/>
<xsl:variable name="main_select_clause"/>
<xsl:template match="/">
<html>
<body>
<table>
<!-- Build Dynamic select statement - $main_select_clause
-->
<!-- May have no predicate, may have 1, may have more than
one -->
<!-- Need to check
(string-length((normalize_space(criteria params)) > 0) -->
<!-- $main_select_clause = "records/record"
-->
<!-- test length of each criteria -->
<!-- append predicate if appropriate [] -->
<!-- <xsl:apply-template select="$main_select_clause"/>
-->
<xsl:apply-templates
select="records/record[contains($letter_criteria,
@letter)][contains($color_criteria, @color)]"/>
</table>
</body>
</html>
</xsl:template>
<xsl:template match="records/record">
<tr>
<td><xsl:value-of select="@num"/></td>
<td><xsl:value-of select="@letter"/></td>
<td><xsl:value-of select="@color"/></td>
</tr>
</xsl:template>
</xsl:stylesheet>
****************************************************************
----
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