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RE: Recursive selection, elegantly

2004-06-06 04:09:25
Hi Stephen,
  I would have written something like this -

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="html" version="1.0"
encoding="UTF-8" indent="yes"/>
        
<xsl:template match="/root">
  <html>
    <head>
      <title/>
    </head>
    <body>
      <table>
        <tr>
          <xsl:apply-templates select="menu[(_at_)ref =
'main_menu']/item"/>
        </tr>
      </table>
    </body>
  </html>
</xsl:template>
        
<xsl:template match="menu/item">
  <xsl:call-template name="x-page">
    <xsl:with-param name="resource"
select="@resource"/>
  </xsl:call-template>
</xsl:template>
        
<xsl:template name="x-page">
  <xsl:param name="resource"/>
  <xsl:variable name="x-name"
select="/root/page[(_at_)about = $resource]/name"/>
  <xsl:variable name="y-name"
select="/root/category[(_at_)about = $resource]/name"/>
  <td>
    <a href="{$resource}">
       <xsl:value-of select="$x-name"/><xsl:value-of
select="$y-name"/>
    </a>
  </td>
</xsl:template>
        
</xsl:stylesheet>

Regards,
Mukul

--- Stephen Tredrea <stephen(_dot_)tredrea(_at_)com-du-it(_dot_)com>
wrote:
Thanks Mukul for your response (and showing me how
to use {} - that's new to
me). Unfortunately your solution doesn't cater for
instances where:

  a) an item in the menu is not a 'page', or
  b) only a selection of resources constitute the
menu

...which is why I want to build the menu from the
menu node.

My apologies for providing an insufficient sample,
here's alternative xml:

<?xml version="1.0" encoding="UTF-8"?>
<root>
   <menu ref="main_menu">
     <item resource="/"/>
     <item resource="/who_we_are"/>
     <item resource="/contact_us"/>
     <item resource="/mulberries"/>
   </menu>
   <page about="/">
     <name>Home</name>
   </page>
   <page about="/who_we_are">
     <name>About us</name>
   </page>
   <page about="/contact_us">
     <name>Contact us</name>
   </page>
   <page about="/disclaimer">
     <name>Disclaimer</name>
   </page>
   <category about="/mulberries">
     <name>Top fruit</name>
   </category>
</root>

Note that in this sample I don't want 'Disclaimer'
in the menu.

This XSL below works but... I think it's clunky and
I don't understand why
the simpler version I provided in my prior example
doesn't work.

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>

  <xsl:output method="html" version="1.0"
encoding="UTF-8" indent="yes"/>

  <xsl:template match="/">
     <xsl:apply-templates
select="//menu[(_at_)ref='main_menu'" mode="main_menu"
/>
  </xsl:template>

  <xsl:template match="menu" mode="main_menu">
    <table>
    <tr>
      <xsl:apply-templates select="item" />
    </tr>
    </table>
  </xsl:template>

  <xsl:template match="item">
    <xsl:param name="resource"><xsl:value-of
select="@resource"
/></xsl:param>
    <xsl:apply-templates select="/root/*[(_at_)about =
$resource]"
mode="menu_item" />
  </xsl:template>

  <xsl:template match="*" mode="menu_item">
    <td>
      <a href="{(_at_)about}">
        <xsl:value-of select="name"/>
      </a>
    </td>
  </xsl:template>
</xsl:stylesheet>

Regard, Stephen

-----Original Message-----
From: Mukul Gandhi [mailto:mukul_gandhi(_at_)yahoo(_dot_)com]
Sent: 06 June 2004 10:02 AM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] Recursive selection, elegantly


Hi Stephen,
  Given the XML -

<?xml version="1.0" encoding="UTF-8"?>
<root>
   <menu ref="main_menu">
     <item resource="/"/>
     <item resource="/who_we_are"/>
     <item resource="/contact_us"/>
     <item resource="/disclaimer"/>
   </menu>
   <page about="/">
     <name>Home</name>
   </page>
   <page about="/who_we_are">
     <name>About us</name>
   </page>
   <page about="/contact_us">
     <name>Contact us</name>
   </page>
   <page about="/disclaimer">
     <name>Disclaimer</name>
   </page>
</root>

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="html" version="1.0"
encoding="UTF-8" indent="yes"/>

<xsl:template match="/root">
  <html>
    <head>
      <title/>
    </head>
    <body>
      <table>
      <tr>
        <xsl:apply-templates select="page"/>
      </tr>
      </table>
    </body>
  </html>
</xsl:template>

<xsl:template match="page">
  <td>
    <a href="{(_at_)about}">
      <xsl:value-of select="name"/>
    </a>
  </td>
</xsl:template>

</xsl:stylesheet>

produces output -

<html>
<head>
  <title></title>
</head>
<body>
  <table>
    <tr>
      <td><a href="/">Home</a></td>
      <td><a href="/who_we_are">About us</a></td>
      <td><a href="/contact_us">Contact us</a></td>
      <td><a href="/disclaimer">Disclaimer</a></td>
    </tr>
  </table>
</body>
</html>

Regards,
Mukul

--- Stephen Tredrea <stephen(_dot_)tredrea(_at_)com-du-it(_dot_)com>
wrote:
Any suggestion on getting this to work? I can do
it
in four steps but not in
three as attempted here!

Thanks, Stephen

XML (snippet):

  <menu ref="main_menu">
    <item resource="/" />
    <item resource="/who_we_are" />
    <item resource="/contact_us" />
    <item resource="/disclaimer" />
  </menu>

  <page about="/">
    <name>Home</name>
  </page>

  <page about="/who_we_are">
    <name>About us</name>
  </page>

  ...etc...

XSL (snippet):

  <xsl:template match="/">
    <xsl:apply-templates
select="//menu[(_at_)ref='main_menu'" mode="main_menu"
/>
  </xsl:template>

  <xsl:template match="menu" mode="main_menu">
    <table>
    <tr>
      <xsl:apply-templates select="//*[(_at_)about =
item/resource]"
mode="menu_item" />
    </tr>
    </table>
  </xsl:template>

  <xsl:template match="*" mode="menu_item">
    <td>
      <xsl:element name="a">
        <xsl:attribute name="href"><xsl:value-of
select="@about"
/></xsl:attribute>
        <xsl:value-of select="name" />
      </xsl:element>
    </td>
  </xsl:template>

Required HTML:

  <table>
  <tr>
    <td><a href="/">Home</a></td>
    <td><a href="/who_we_are">About us</a></td>
    ...etc...
  </tr>
  </table>




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