RE: [xsl] [XSL] Counting Child Nodes?

A few things here, Alice:

- It seems you have your if's and when's confused here. This sequence:
  <xsl:choose>
    <xsl:when test="someTest">someResult</xsl:when>
    <xsl:otherwise/>
  </xsl:choose>
is the exact same as the following:
  <xsl:if test="someTest">someResult</xsl:if>
Right beneath that, though, you have a series of three <xsl:if/>
statements that create an attribute "style", of which two could possible
be true at a time. This sounds like a prime case for using <xsl:when/>.

- ./@rendition is the exact same as @rendition. Since you're not
switching the context node in your XPath tests involving $rendition, it
looks like the variable $rendition isn't needed either. (This might
change in your final stylesheet, but keep it simple until then!)

- "child::text()" is the same as "text()", which is the same as "." in
functions that evaluate the value of their arguments. And
string-length() doesn't even need an argument, if you want it to default
to the value of the context node. ... Looking at it, though, since there
are child _elements_ in the context node, you'd be better off sticking
with text() for consistency.

- It seems you forgot a parenthesis in your second condition (also,
numbers are a primitive datatype in XPath, so don't quote them):
  string-length('25 ' &lt; child::text() &lt; '50')
Two inequality tests in a row doesn't work in XPath like it does in
math; &lt; outputs a boolean, so you're testing if the boolean result is
less than 50. Always true.

With that, here's my rendition of the fixed stylesheet:
<xsl:template match="book">
  <div>
    <p>
      <xsl:if test="@rendition != ''">
        <div class="{(_at_)rendition}">
          <xsl:attribute name="style">
            <xsl:variable name="bg-size">
              <xsl:choose>
                <xsl:when test="count(p) &gt; 1">_large</xsl:when>
                <xsl:when test="string-length(text()) &lt; 25"/>
                <xsl:when test="string-length(text()) &lt;
50)">_med</xsl:when>
              </xsl:choose>
            </xsl:variable>
            <xsl:value-of select="concat('background-image:url(&apos;',
@rendition, $bg-size, '.png&apos;)'"/>
          </xsl:attribute>

          <p>
            <xsl:call-template name="rend"/>
            <xsl:apply-templates/>
          </p>
        </div>
      </xsl:if>
    </p>
  </div>
</xsl:template>

Give it a spin, see how it works.

~ Scott


-----Original Message-----
From: Alice Ju-Hsuan Wei [mailto:ajwei(_at_)indiana(_dot_)edu] 
Sent: Friday, October 19, 2007 9:12 AM
To: xsl-list
Subject: [xsl] [XSL] Counting Child Nodes?

Hi,

  I am making attempts to make the output of the transformed XML to be 
able to display different images based on the nodes and string length. 
Below is the XSLT:

XSLT:


    <xsl:template match="book">
        <xsl:variable name="rendition">
            <xsl:value-of select="./@rendition"/>
        </xsl:variable>
        <div>
            <p>
               <xsl:choose>

                    <xsl:when test="$rendition!=''">
                        <div>
                            <xsl:attribute name="class">
                                <xsl:value-of select="$rendition"/>
                            </xsl:attribute>
                            <xsl:if 
test="string-length(child::text())&lt;'25'">
                                <xsl:attribute name="style"> 
background-image:url('<xsl:value-of
                                        select="./@rendition"/>.png') 
</xsl:attribute>
                            </xsl:if>
                            <xsl:if test="string-length('25 ' &lt; 
child::text() &lt; '50')">
                                <xsl:attribute name="style"> 
background-image:url('<xsl:value-of
                                        
select="./@rendition"/>_med.png') </xsl:attribute>
                            </xsl:if>
                             <xsl:if test="count(child::p) &gt; 1">
                                <xsl:attribute name="style"> 
background-image:url('<xsl:value-of
                                        
select="./@rendition"/>_large.png') </xsl:attribute>
                            </xsl:if>

                            <p>
                                <xsl:call-template name="rend"/>
                                <xsl:apply-templates/>
                            </p>
                        </div>
                    </xsl:when>
                    <xsl:otherwise>
                        <!--Don't display anything-->
                    </xsl:otherwise>
                </xsl:choose>
            </p>
        </div>
    </xsl:template>

XML:

<book topic="Technology" rendition="xslt" author="Tennison, Jeni" 
title="Beginning XSLT">

    <p>New York: Apress, 2002.</p>
    <p>The book serves as an introduction to XSLT based on the examples 
of a television
program set. A resourceful book for those new to the technology.</p>
  </book>

I want to use the code displayed above (XML) to display the file name 
with the name of xslt_large, and now in the HTML source it does not 
display that, even though the code above has two <p> tags. Can anyone 
please help me out?

Anything is appreciated.

Alice


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