XSLT Matching Tree from Different Nodes

[jrapp]

I'm trying to output a category tree/sitemap to HTML using XML & XSLT. The XML gives me a list of categories and the current selected category in two different nodes. I need to grab the category node from the tree that corresponds to selected category. Here's a sample XML:

<Page>
   <CategoryTree>
      <CurrentCategoryID>0</CurrentCategoryID>
      <Categories>
        <CategoryID>0</CategoryID>
        <CategoryName>__parent</CategoryName>
        <ChildCategories>
<Category>
	<CategoryID>31</CategoryID>
	<CategoryName>My Category</CategoryName>
	<ChildCategories>
	  <Category>
		<CategoryID>39</CategoryID>
		<CategoryName>Child 1</CategoryName>
		<ChildCategories />
	  </Category>
	  <Category>
		<CategoryID>42</CategoryID>
		<CategoryName>Child2</CategoryName>
		<ChildCategories />
	  </Category>
	</ChildCategories>
  </Category>
        </ChildCategories>
      </Categories>
   </CategoryTree>
    <BrowseCurrentCategory>
      <CategoryID>31</CategoryID>
    </BrowseCurrentCategory>
</Page>

I can rock it with an xpath that looks like:

/Page/CategoryTree//[CategoryID=31]

but what I really need is:

/Page/CategoryTree//[CategoryID=/Page/BrowseCurrentCategory/CategoryID]

however, that just ends up matching everything. Anybody know why? Thank you, thank you!

 

[k5tm]

You would probably make your life simpler, and the XPath expression easier to read, if you used a variable.

<xsl:variable name="desiredCategory" select="/Page/BrowseCurrentCategory"/>
<xsl:for-each select="/Page/Categories//Category[CategoryId=$desiredCategory]">
...
</xsl:for-each>

The XPath expression in the xsl:for-each (given as a usage example) will clearly only select <Category> elements, and in particular, only those <Category> elements that have a child <CategoryID> element whose value is equal to the value of $desiredCategory set in the previous processing instruction.

Tom Morrison

http://www.liant.com

 

[jrapp]

I like it! I'll give it a try. Thanks