Re: [xsl] A general <xsl:key> question.

["Edward L. Knoll" <ed.knoll@xxxxxxxxxxxxxx>]

Jeni Tennison wrote:
> 
> Hi Edward,
> 
> > Do keys have to be used within a context in which the associated
> > nodes exist?
> 
> Yes. The context node at the point where you use the key (with the
> key() function) has to be a node in the document that you're
> searching.
> 
> Usually this means that you should create a variable to hold the key
> value that you want to search for, then switch into the context of the
> document that you want to search in (using <xsl:for-each>) before
> using the key.
> 
> I can't tell precisely what's going to work with your code, but
> something like:
> 
> <xsl:key name="PageKey" match="/gnsl:Results/gnsl:Table/gnsl:Row"
>          use="((count(preceding-sibling::*) div $RowsPerPage) + 1)" />
> 
> <xsl:variable name="results" select="/" />
> 
> <xsl:template name="ProcessPageRows">
>    <xsl:variable name="PageNum" select="@PageNum" />
>    <xsl:variable name="StartRow" select="@StartRow" />
>    <xsl:variable name="EndRow" select="@EndRow" />
> 
>    <xsl:if test="$NumberOfRows">
>       <xsl:for-each select="$results">
>         <xsl:apply-templates select="key('PageKey',$PageNum)" />
>       </xsl:for-each>
>    </xsl:if>
> </xsl:template>
> 
> You need to set the $results variable to being a node set containing a
> single node in the document in which the gnsl:Row elements that you're
> interested in are held.
> 
> Jeni Tennison
> http://www.jenitennison.com/

Worked, have to do the performance test to see what I gained.  Had to
adjust the syntax a bit; (forcing the key to be an integer helped a
bunch):

<xsl:key name="PageKey" match="/gnsl:Results/gnsl:Table/gnsl:Row"
         use="floor(count(preceding-sibling::gnsl:Row) div $RowsPerPage)
+ 1" />
<xsl:variable name="Results" select="/" />

<xsl:template name="ProcessPageRows">
   <xsl:variable name="PageNum" select="@PageNum" />
   <xsl:if test="$NumberOfRows">
      <xsl:for-each select="$Results">
      <xsl:for-each select="key('PageKey',$PageNum)">

         <xsl:apply-templates select="." />

      </xsl:for-each>
      </xsl:for-each>
   </xsl:if>
</xsl:template>

Thanks for the help,
Ed

-- 
Edward L. Knoll   Phone (work)     : (719)484-2717
                  e-mail (work)    : ed.knoll@xxxxxxxxxxxxxx
                  e-mail (business): eknoll@xxxxxxxxxx
                  e-mail (personal): edward@xxxxxxxxxxx

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