Re: alternating node type in a loop

--- "Tyler Queen" <xmllist at telocity dot com> wrote:

> 
> I want to loop through all the article nodes within a
> section element. The problem is I want to alternate the
> way they are looped by "type" going "1,2,1,2,1,2" and
> then when there aren't anymore to alternate through
> finish looping through the remaining nodes.
> Any Ideas?
> 
> This is the xml
> 
> <articles>
> 	<section>
> 		<article type="1">Article</article>
> 		<article type="2">Article</article>
> 		<article type="2">Article</article>
> 		<article type="1">Article</article>
> 		<article type="2">Article</article>
> 		<article type="1">Article</article>
> 		<article type="1">Article</article>
> 		<article type="1">Article</article>
> 	</section>
> <articles>
> 

Hi Tyler,

Here is a solution. This transformation:

<xsl:stylesheet version="1.0" 
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  
  <xsl:output omit-xml-declaration="yes" indent="yes"/>      

  <xsl:template match="section">
    <xsl:variable name="vcnt1" select="count(article[@type=1])"/>
    <xsl:variable name="vcnt2" select="count(article[@type=2])"/>
    
    <xsl:variable name="vcntPairs">
      <xsl:choose>
        <xsl:when test="$vcnt1 &lt;= $vcnt2">
          <xsl:value-of select="$vcnt1"/>
        </xsl:when>
        <xsl:otherwise>
          <xsl:value-of select="$vcnt2"/>
        </xsl:otherwise>
      </xsl:choose>
    </xsl:variable>
    
    <xsl:for-each select="article
                           [@type=1]
                             [position() &lt;= $vcntPairs]">
     <xsl:variable name="vPos1" select="position()"/>
     
     <xsl:apply-templates select="."/>
     <xsl:apply-templates select="../article[@type=2]
                                         [$vPos1]"/>
    </xsl:for-each>
    
    <xsl:apply-templates select="article
                                  [@type=1]
                                    [position() > $vcntPairs]
                               | article
                                  [@type=2]
                                    [position() > $vcntPairs]"/>
  </xsl:template>
  
  <xsl:template match="article" >
    <xsl:copy-of select="."/>
  </xsl:template>
  
</xsl:stylesheet>

when applied to your source xml:

<articles>
	<section>
		<article type="1">Article</article>
		<article type="2">Article</article>
		<article type="2">Article</article>
		<article type="1">Article</article>
		<article type="2">Article</article>
		<article type="1">Article</article>
		<article type="1">Article</article>
		<article type="1">Article</article>
	</section>
</articles>

Produces:

<article type="1">Article</article>
<article type="2">Article</article>
<article type="1">Article</article>
<article type="2">Article</article>
<article type="1">Article</article>
<article type="2">Article</article>
<article type="1">Article</article>
<article type="1">Article</article>

Hope this helped.



=====
Cheers,

Dimitre Novatchev.
http://fxsl.sourceforge.net/ -- the home of FXSL

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