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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Using XPath in an xsl:param?
 I am using client-side transformations to filter XML in IE 6 (using MSXML)
and have run into a question about using xsl:param to pass in a list of
string values. As an example, here is some bogus XML ans XSL to illustrate
the issues I'm having:
<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml-stylesheet type="text/xsl" href="cdcatalog.xsl"?>
<!-- Edited with XML Spy v4.2 -->
<catalog>
<cd>
<title>Empire Burlesque</title>
<artist>Bob Dylan</artist>
<country>USA</country>
<company>Columbia</company>
<price>10.90</price>
<year>1985</year>
</cd>
<cd>
<title>When a man loves a woman</title>
<artist>Percy Sledge</artist>
<country>USA</country>
<company>Atlantic</company>
<price>8.70</price>
<year>1987</year>
</cd>
<cd>
<title>Big Willie style</title>
<artist>Will Smith</artist>
<country>USA</country>
<company>Columbia</company>
<price>9.90</price>
<year>1997</year>
</cd>
<cd>
<title>Private Dancer</title>
<artist>Tina Turner</artist>
<country>UK</country>
<company>Capitol</company>
<price>8.90</price>
<year>1983</year>
</cd>
<cd>
<title>Red</title>
<artist>The Communards</artist>
<country>UK</country>
<company>London</company>
<price>7.80</price>
<year>1987</year>
</cd>
</catalog>
This is transformed using the following stylesheet:
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:param name="test" select="artist='Bob Dylan' or artist='Tina Turner'"/>
<xsl:template match="catalog">
<html>
<body>
<h2>My CD Collection</h2>
<table border="1">
<tr bgcolor="#9acd32">
<th align="left">Title</th>
<th align="left">Artist</th>
</tr>
<xsl:apply-templates select="cd"/>
<tr><td colspan="2"><xsl:value-of select="$test"/></td></tr>
</table>
</body>
</html>
</xsl:template>
<xsl:template match="cd"/>
<xsl:template match="cd[$test]">
<tr>
<td><xsl:value-of select="title"/></td>
<td><xsl:value-of select="artist"/></td>
</tr>
</xsl:template>
</xsl:stylesheet>
I need to be able to dynamically pass in the artist names to use in the
match="cd[$test]" template. The first question is that the select statement
in the global param declaration seems to be interpreting the XPath statement
rather than treating it as a literal string. It ends up being evaluated as
a boolean. Is there any way to prevent this from happening and keep it as a
string value? In addition, I get an error telling me that <xsl:template
match="cd[$test]"> does not support variables within the expression. I'm
not sure if this is due to the interpretation of $test.
Is there any way to get around these issues? Essentially I'm looking for a
way to pass in a dynamic array of variables and create the match=""
statement dynamically. Is this possible by passing the values I need in as
a delimited string like <xsl:param name="test" select="Bob Dylan|Tina
Turner"/> and then splitting up the result? Just to clarify - the values
can be any combination of artist/name and so it is not practical to create
separate stylesheets for each case. Any help is much appreciated.
Kevin
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