Re: alternating bg colour in nested data

Im trying to get alternating table row background colours from nested xml.
...
I currently get alternating row colours using this kind of template for each
group:

<xsl:template match="group1">
<xsl:variable name="position" select="position()" />

<xsl:choose>
  <xsl:when test="$position mod 2 = 1">

    <xsl:call-template name="row_even"/>
  </xsl:when>
  <xsl:otherwise>
    <xsl:call-template name="row_odd"/>
  </xsl:otherwise>
</xsl:choose>
<xsl:apply-templates select="group2"/>
</xsl:template>

Each template is virtually identical apart from the 'groupX' number.

Also,
occasionally two adjacent rows share the same colour (where group changes
and last elem pos was even)

T:\ftemp>type andrew.xml
<group1>
  <data1/>
  <data2/>
  <group2>
    <data1/>
    <data2/>
  </group2>
  <group2>
    <data1/>
    <data2/>
    <group3>
      <data1/>
      <data2/>
    </group3>
    <group3>
      <data1/>
      <data2/>
      <group4>
        <data1/>
        <data2/>
      </group4>
    </group3>
  </group2>
</group1>

T:\ftemp>type andrew.xsl
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0">

<xsl:template match="/">
  <table>
    <xsl:apply-templates select="group1"/>
  </table>
</xsl:template>

<xsl:template match="group1|group2|group3|group4">
<xsl:param name="last" select="0"/>
<xsl:choose>
  <xsl:when test="( $last + position() ) mod 2 = 1">
    <xsl:call-template name="row_even"/>
  </xsl:when>
  <xsl:otherwise>
    <xsl:call-template name="row_odd"/>
  </xsl:otherwise>
</xsl:choose>
<xsl:apply-templates select="group2|group3|group4">
  <xsl:with-param name="last" select="$last + last()"/>
</xsl:apply-templates>
</xsl:template>

<xsl:template name="row_even">
  <tr bgcolor="#cccccc">
    <xsl:for-each select="*[not(starts-with(name(),'group'))]">
      <td><xsl:value-of select="concat(name(..),' ',name(.))"/></td>
    </xsl:for-each>
  </tr>
</xsl:template>

<xsl:template name="row_odd">
  <tr>
    <xsl:for-each select="*[not(starts-with(name(),'group'))]">
      <td><xsl:value-of select="concat(name(..),' ',name(.))"/></td>
    </xsl:for-each>
  </tr>
</xsl:template>

T:\ftemp>type andrew.htm
<?xml version="1.0" encoding="utf-8"?>
<table>
<tr bgcolor="#cccccc">
<td>group1 data1</td>
<td>group1 data2</td>
</tr>
<tr>
<td>group2 data1</td>
<td>group2 data2</td>
</tr>
<tr bgcolor="#cccccc">
<td>group2 data1</td>
<td>group2 data2</td>
</tr>
<tr>
<td>group3 data1</td>
<td>group3 data2</td>
</tr>
<tr bgcolor="#cccccc">
<td>group3 data1</td>
<td>group3 data2</td>
</tr>
<tr>
<td>group4 data1</td>
<td>group4 data2</td>
</tr>
</table>

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