Re: [xsl] Sorting and grouping

[ronald heller <ronald at salience dot nl>]

I had a go at it, hope this suffices for you I tested in under saxon 6.4.2.

XML:
<list>
    <item at="d">d</item>
    <item at="e">e</item>
    <item at="i">i</item>
    <item at="k">k</item>
    <item at="l">l</item>
    <item at="a">a</item>
    <item at="b">b</item>
    <item at="c">c</item>
    <item at="j">j</item>
    <item at="f">f</item>
    <item at="g">g</item>
    <item at="h">h</item>
    <item at="a">a</item>
    <item at="b">b</item>
    <item at="c">c</item>
</list>

xSLT:
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
    <xsl:output method="xml" encoding="Windows-1252" />

    <xsl:param name="group">5</xsl:param>

    <xsl:template match="list">
             <xsl:apply-templates select="item">
                 <xsl:sort select="@at" order="ascending"/>
             </xsl:apply-templates>
         </xsl:template>

    <xsl:template match="item">
                 <xsl:choose>
                         <xsl:when test="position() mod $group =1">
                                 <xsl:comment>Begin new group</xsl:comment>
                                 <p><xsl:value-of select="position()"/> - 
<xsl:apply-templates/></p>
                         </xsl:when>
                         <xsl:when test="position() mod $group =0">
                                 <p><xsl:value-of select="position()"/> - 
<xsl:apply-templates/></p>
                                 <xsl:comment>End group</xsl:comment>
                         </xsl:when>
                         <xsl:when test="not(following-sibling::item) and 
not(position() mod $group =0)">
                                 <p><xsl:value-of select="position()"/> - 
<xsl:apply-templates/></p>
                                 <xsl:comment>End group</xsl:comment>
                         </xsl:when>
                         <xsl:otherwise>
                         <p><xsl:value-of select="position()"/> - 
<xsl:apply-templates/></p>
                         </xsl:otherwise>

                 </xsl:choose>

    </xsl:template>
</xsl:stylesheet>

Groups are separated by comments.

GRTZ

RH
At 10:33 AM 10/30/01 +0100, you wrote:
>Hi,
>can someone help me with the following problem?
>
>I have an unordered list of items:
><list>
>     <item at="...">
>         ...
>     </item>
>     ...
>     <item at="...">
>         ...
>     </item>
></list>
>
>I want to sort this list by an 'at' attribute and then display these
>sorted items in groups.
>Each group should consist of a fixed number (let's say 5) of items. I
>can solve this problem
>only by first sorting the list into a temporary .xml file and then use
>this file for grouping.
>What's even worse, I'am not able to handle the problem in one single xsl
>transformation file.
>
>To be more specific, one can't do it in one pass like this:
>         <xsl:apply-templates select="item">
>             <xsl:sort select="@at" order="descending"/>
>         </xsl:apply-templates>
>         ....
>         <xsl:template match="item[(position() mod 5) = 1]">
>             <xsl:variable name="group"
>select=".|following::item[position() &lt; 5]"/>
>because last 'select' selects following items in document order (not in
>sorted order).
>
>Is there a way to solve that without creating a temporary file?
>
>Thank you for your help.
>  Zdenek
>
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list


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