Problem: I need to create a nested HTML unordered list from XML this is not nested. Additionally I need to cross reference the XML with an 'allowed nodes' section that is also contained in the document.
Example XML:
<content>
<data>
<navigation>
<link name="about us" url="#"/>
<link name="staff" url="staff.asp" parent="about us"/>
<link name="contact" url="contact.asp" parent="about us"/>
<link name="facebook" url="facebook.asp"/>
</navigation>
</data>
<allowedlinks>
<link name="about us"/>
<link name="facebook"/>
</allowedlinks>
</content>
Example Result HTML (note I have left out the boiler plate code):
<ul>
<li>
about us
<ul>
<li>staff</li>
<li>contact</li>
</ul>
</li>
<li>facebook</li>
</ul>
Ultimately this will form a nav menu on a site.
Rules: -I need to use XSLT 1.0 to create a solution.
-If a link exists, I need to add it to the UL and create any nested child UL's if any siblings contain a @parent of the current nodes @name.
-Before generating the LI item of any node that does not have a @parent, it must first be confirmed that its @name matches a link @name in the allowed links section.
In my opinion - the structure of the XML being transformed is really stupid and makes the transform process overly complex - however since I am unable to change the original XML, I need a solution.
Note - I do already have an answer which works okay, I will post it shortly. I wanted to see other possible answers first :)
Bonus if this can be done with template matching and not too many for each loops.
My solution contains 2 nested for-each's which I do not like.
This is a classic case for using keys:
XSLT 1.0
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" omit-xml-declaration="yes" version="1.0" encoding="utf-8" indent="yes"/>
<xsl:key name="allowed-link" match="allowedlinks/link" use="@name" />
<xsl:key name="link-by-parent" match="link" use="@parent" />
<xsl:template match="/content">
<ul>
<xsl:apply-templates select="data/navigation/link[not(@parent) and key('allowed-link', @name)]"/>
</ul>
</xsl:template>
<xsl:template match="link">
<li>
<xsl:value-of select="@name"/>
<xsl:variable name="sublinks" select="key('link-by-parent', @name)" />
<xsl:if test="$sublinks">
<ul>
<xsl:apply-templates select="$sublinks"/>
</ul>
</xsl:if>
</li>
</xsl:template>
</xsl:stylesheet>
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