RE: [xsl] Re: <xsl:choose> or variable syntax incorrect?

Subject: RE: [xsl] Re: <xsl:choose> or variable syntax incorrect?
From: "Kathy Burke" <Kathy_Burke@xxxxxxxxx>
Date: Fri, 26 Sep 2003 14:38:06 -0400
First, I truly appreciate your responding. But please tell me how I did not
"explain the problem I've solving"? I honestly thought I did!

<station name='StationOne'>
   <board sn='123'/>
   <board sn='124'/>

If there are no <board> elements in the <station> element, I would like to
have a blue row with the value-of the <station> name attribute as text:

Station One  (in red text)

Otherwise, I would like the same text (Station One) but in a blue row. 

I still don't understand why this doesn't work:

<xsl:template match="Station">

<xsl:variable name="boards" select="//Station[name='@name']/Boards/Board"/>
//to select the boards under the specific station for each node?

<xsl:variable name="nboards" select="count($boards)" />
//to count the result of the nodeset above?

<xsl:when test="$nboards &lt; 1">  //if variable is < 1 (or empty)
<tr bgcolor="navy" valign="middle"> //create a blue row
<td><xsl:value-of select="@name"/></td> //put the name attribute text here
<tr bgcolor="red" valign="middle">   //otherwise, create a red row
<td><xsl:value-of select="@name"/></td>

Although it doesn't work, why is it SO dreadful? If I could correctly return
the variant I need (are there boards for this station?) wouldn't the rest be

I came up with this either out of books or from the MANY examples I've read
on the newsgroups.

I have read Jeni's book (and M. Kay's as well). Unfortunately, that doesn't
mean I've absorbed it all :-?

If you, or anyone, could please point me to an example of what I've
described, I would truly appreciate it.

Thanks again.


-----Original Message-----
From: Dimitre Novatchev [mailto:dnovatchev@xxxxxxxxx]
Sent: Friday, September 26, 2003 2:29 PM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: [xsl] Re: <xsl:choose> or variable syntax incorrect?

"Kathy Burke" <Kathy_Burke@xxxxxxxxx> wrote in message
> Same problem...but perhaps not the variable name issue? I've used the
> current() syntax per Dimitri. Again, I'm trying to get a navy row if the
> when test < 1 count, otherwise red. My xml source has three <Station>
> elements, 2 have <Board> elements, 1 does not. However, all rows remain
> navy. Any other comments on where I could be gong astray with the

You could be going astray almost everywhere -- the code full of weird things
to me.

> <xsl:template match="Station">
> <xsl:variable name="boards"
> />


Are you sure you really *mean* this? This predicate is true if the current
node has a "name" attribute (which is probably always the case).

> <xsl:variable name="nboards" select="count($boards)" />

Because you're later testing to see if the count is less than one or not,
you do not need the count at all. You just need whether the nodeset is empty
or not -- this happens to be the expression



> <xsl:choose>
> <xsl:when test="$nboards &lt; 1">
>    <tr bgcolor="navy" valign="middle">
>    <td><xsl:value-of select="@name"/></td>
> </xsl:when>
> <xsl:otherwise>
>    <tr bgcolor="red" valign="middle">
>    <td><xsl:value-of select="@name"/></td>
> </xsl:otherwise>
> </xsl:choose>

This test seems also very strange for generating rows with alternating
properties, but you haven't at all explained the problem you're solving, so
it is difficult to say that what you're doing is just wrong.

I strongly recommend reading a good introductory book on XSLT -- e.g.

     "Beginning XSLT"

for everyone, who needs to start understanding some basic concepts and
techniques in writing XSLT transformations.


Dimitre Novatchev. -- the home of FXSL

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