RE: [xsl] Error xsl:param may not be used here

["Andrew Welch" <awelch@xxxxxxxxxxxxxxx>]

><xsl:when test="not(string-length($graph/@type) = 0)">

Here you are treating the variable $graph as a nodeset, when it is only
a string.


 <xsl:template name="drawGraph">
  <xsl:variable name="graph" select="." />
  <xsl:param name="type">
   <xsl:choose>
    <xsl:when test="not(string-length($graph/@type) = 0)">
     <xsl:value-of select="$graph/@type" />
    </xsl:when>
    <xsl:otherwise>x-y</xsl:otherwise>
   </xsl:choose>
  </xsl:param>
  <type>
   <xsl:value-of select="$type"/>
  </type>
 </xsl:template>

You can just drop $graph here and use @type on its own, as the current
node will always be '.'

I understand this is a fictional example, but wouldnt you just need:

 <xsl:template name="drawGraph">
   <xsl:choose>
    <xsl:when test="string-length(@type)">
     <xsl:value-of select="@type" />
    </xsl:when>
    <xsl:otherwise>x-y</xsl:otherwise>
   </xsl:choose>
 </xsl:template>

This will produce the same results as the above template.

cheers
andrew

> -----Original Message-----
> From: Ryan Beesley [mailto:RBeesley@xxxxxxxxxxxx]
> Sent: 14 October 2002 09:42
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: [xsl] Error xsl:param may not be used here
> 
> 
> I know that this error has been addressed on this list 
> before, but I don't
> think it has been answered in this context.
> 
> I have been working on a set of svg graphing (xslt) utilities 
> that I'd like
> to make publically available once my senior design project is 
> complete, but
> I've run into a slight snag.  I wanted to be able to 
> customize different
> parameters in multiple ways.  Below is listed a small segment 
> of my xml and
> xslt.
> 
> ---- graph.xml ----
> <?xml version="1.0" encoding="UTF-8"?>
> <graph type="pie">
>  <!-- Graph data goes here -->
> </graph>
> 
> ---- graph.xslt ----
> <?xml version="1.0" encoding="UTF-8"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
>  <xsl:output method="xml" version="1.0" encoding="UTF-8" 
> indent="yes"/>
> 
>  <xsl:template match="graph">
>   <xsl:call-template name="drawGraph">
>    <!-- Optional parameters to alter graph -->
>    <xsl:with-param name="type" select="'bar'"/>
>   </xsl:call-template>
>  </xsl:template>
> 
>  <xsl:template name="drawGraph">
>   <xsl:variable name="graph" select="." />
>   <xsl:param name="type">
>    <xsl:choose>
>     <xsl:when test="not(string-length($graph/@type) = 0)">
>      <xsl:value-of select="$graph/@type" />
>     </xsl:when>
>     <xsl:otherwise>x-y</xsl:otherwise>
>    </xsl:choose>
>   </xsl:param>
>   <type>
>    <xsl:value-of select="$type"/>
>   </type>
>  </xsl:template>
> 
> </xsl:stylesheet>
> 
> ---- output.xml ----
> <?xml version="1.0" encoding="UTF-8"?>
> <type>bar</type>
> 
> Although you would probibly never include a parameter in both 
> the calling
> template and the xml data, I have included both to 
> demonstrate the use.  The
> passed template param should win however.  When evaluating 
> this with XML
> Spy, in debug mode, it works exactly as I want it too.  I can 
> change the
> value of @type either while calling the template, or directly 
> from the xml
> data.  If neither parameter was provided, the template 
> assumes a default.
> 
> Xalan and MSXML fail completely.  If I place my params inside 
> the choose,
> then they aren't recognized, as should be, but it doesn't 
> seem to like my
> nested choose for the param either.  I suspect that this 
> structure is the
> source of my error: xsl:param may not be used here.
> 
> If anyone has suggestions as to how I can make this work, I'm 
> always eager
> to learn.  I believe I could use a variable to make this 
> work, but then I
> wouldn't be able to change it from the template, right?
> 
> Ryan Beesley
> Rbeesley@xxxxxxxxxxxx
> Founder, Atum Innovations
> 
> 
> 
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list
> 
> 
> 
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