Re: [xsl] every tenth row change bgcolor

Good morning, Jarkko!

At 2003-06-06 13:20 +0300, Jarkko Moilanen wrote:

1. The question is that why in the first group is only 9 rows?

2. In this part : (floor(position() div 20) mod 2),
   Am I saying something like modulate the group of
   20 by 0 and 1 values? Quess not, but have to suggest something =)

There were a number of problems with your original stylesheet that combined to give you the problems you were having.

(1) - counting in XSLT begins at 1, so at the least, your calculation has to deal with "(position() - 1)" instead of "position()" when doing modulo arithmetic

(2) - I was confused why you were using modulo 20 instead of 10 when your groups were of 10, but then I realized you were using <xsl:apply-templates/> instead of <xsl:apply-templates select="Report/Row"/> ... the difference is that without a select= attribute, *all* child nodes are processed, thus processing the intervening text nodes as well as the <Row> nodes. It happened that between your groups of 10 you had comments which shifted your "child node" count by 1

So, you will see below a working version where I tighten up the node processing by pushing only the nodes that are to be affected by the position() function in the current node list, and the counting modulo arithmetic is based on the grouping of 10 Rows, not the combination of 10 Rows and 10 Text nodes.

I hope this helps.

............... Ken

p.s. remember the exercise of counting the node children and neglecting to count the text nodes at the end of each line? I mentioned how this is a *very* common mistake made by most users of XSLT.

T:\ftemp>type jarkko.xml
<?xml version="1.0" encoding="UTF-8"?>
<Report>

 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row> <!-- 10 -->

 <Row>blue</Row>
 <Row>blue</Row>
 <Row>blue</Row>
 <Row>blue</Row>
 <Row>blue</Row>
 <Row>blue</Row>
 <Row>blue</Row>
 <Row>blue</Row>
 <Row>blue</Row>
 <Row>blue</Row> <!-- 20 -->

 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row>
 <Row>white</Row> <!-- 30 -->

</Report>

T:\ftemp>type jarkko.xsl
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="html"/>
<!-- Root template of my stylesheet -->
   <xsl:template match="/">
     <html>
       <head>
          <title>Color rows</title>
        <style type="text/css">
        .r0 {background-color: white}
        .r1 {background-color: blue}
        </style>
       </head>
       <body>
        <table border="1">
          <xsl:apply-templates select="Report/Row"/>
        </table>
       </body>
     </html>
   </xsl:template>

   <xsl:template match="Row">
     <tr class="r{floor((position() - 1) div 10) mod 2}">
       <xsl:apply-templates/>
     </tr>
   </xsl:template>

</xsl:stylesheet>

T:\ftemp>saxon -o jarkko.htm jarkko.xml jarkko.xsl

T:\ftemp>type jarkko.htm
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

      <title>Color rows</title><style type="text/css">
        .r0 {background-color: white}
        .r1 {background-color: blue}
        </style></head>
   <body>
      <table border="1">
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r1">blue</tr>
         <tr class="r1">blue</tr>
         <tr class="r1">blue</tr>
         <tr class="r1">blue</tr>
         <tr class="r1">blue</tr>
         <tr class="r1">blue</tr>
         <tr class="r1">blue</tr>
         <tr class="r1">blue</tr>
         <tr class="r1">blue</tr>
         <tr class="r1">blue</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
         <tr class="r0">white</tr>
      </table>
   </body>
</html>
T:\ftemp>rem Done!

--
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G. Ken Holman                mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
Crane Softwrights Ltd.         http://www.CraneSoftwrights.com/s/
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