Re: [xsl] looping problem, <xsl: for-each>??

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

At 01:08 PM 10/7/2003, Mukul wrote:
> Hi James,
>  This is a grouping problem, which can be solved by
> the Muenchian method. Please try the following XSL --
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
>    <xsl:output method="xml" version="1.0"
> encoding="UTF-8" indent="yes"/>
>    <xsl:key name="x" match="/rss/channel/item"
> use="category" />
>
>     <xsl:template match="/">
>       <xsl:for-each select="rss/channel/item">
>         <xsl:if test="generate-id(.) = generate-id(key('x',
> category)[1])">
>          <h1>
>             <xsl:value-of select="category" />
>          </h1>
>         <xsl:for-each select="key('x', category)">
> ITEM<!-- ?? -->  <xsl:value-of select="description"/>
>         </xsl:for-each>
>        </xsl:if>
>      </xsl:for-each>
>    </xsl:template>
>
> </xsl:stylesheet>
>
> You want the labels to be output as -- ITEM1, ITEM2,
> ITEM3, ITEM 4. I cannot think of a good way to do
> this. <!-- ?? --> part of my XSL needs to be
> completed.
>
> Something using position() and count() should be
> required..

In the general case, two passes, or a resort to a node-set extension 
function, is necessary for a clean solution to this, because the numbering 
depends not on the order and position of nodes in the source document, but 
in the result.

When we are not reordering the nodes within their groups, however, one can 
often force this ...

<xsl:value-of select="count(preceding::item[category=current()/category])+1"/>

but be warned: it can be slowish to execute on large documents.

No variable reassignment is called for here.

Cheers,
Wendell

James's spec:

> I have the following format but am having trouble trying to group items 
> (in html) under one common category so that it isnt repeated for every 
> item but can act as a title:
> <rss version="0.92">
> - <channel>
> - <item>
>  <title>title here</title>
>  <category>Top Stories</category>
>  <link>http</link>
>  <description>text is heredescription>
>  </item>
> </channel>
> <item>
>  <title>title here</title>
>  <category>top stories</category>
>  <link>http</link>
>  <description>text is heredescription>
>  </item>
> </channel>
> <item>
>  <title>title here</title>
>  <category>Stories today</category>
>  <link>http</link>
>  <description>text is heredescription>
>  </item>
> </channel>
> <item>
>  <title>title here</title>
>  <category>Stories today</category>
>  <link>http</link>
>  <description>text is heredescription>
>  </item>
> </channel>
> </rss>
>
> e.g. the final look i wanted to create was:
> <h1>top stories </h1>
> ITEM1 <xsl:value-of select="description">
> ITEM2 <xsl:value-of select="description">
> <h1>stories today</h1>
> ITEM3 <xsl:value-of select="description">
> ITEM4 <xsl:value-of select="description">



======================================================================
Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
17 West Jefferson Street                    Direct Phone: 301/315-9635
Suite 207                                          Phone: 301/315-9631
Rockville, MD  20850                                 Fax: 301/315-8285
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