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POHow to build a recursive navigation in XSL/XML
 

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  1. POHow to build a recursive navigation in XSL/XML
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    <p>I'm trying to build a navigation that in theory could recurse infinitely with XSL. Unfortunately my skills in this arena are still being built. Can anyone tell me where I'm going wrong with this code?</p> <p>The kicker here is that the first 2 levels of the nav are somewhat unique (class names and such) but after level 3 the nav is pretty much the same elements being nested over and over.</p> <p><strong>To Update:</strong> There's no recursion after nav level 2, the output is non existent after level 2, and I can't figure out how to apply the recursion. I feel like this should be easier but my skills in XSL are not that great.</p> <p><strong>HTML (What we need it to produce):</strong></p> <pre><code> &lt;ul class="nav-l1"&gt; &lt;li class="nav-active"&gt;&lt;a href="nav2.html" class="nav-item trigger-chan nav-next"&gt;&lt;span&gt;&lt;span class="trigger-cntr"&gt;First Level Parent&lt;/span&gt;&lt;/span&gt;&lt;/a&gt; &lt;ul class="nav-l2 nav-hidden"&gt; &lt;li class="nav-active"&gt;&lt;a href="nav2.html" class="nav-item"&gt;&lt;span&gt;Overview&lt;/span&gt;&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#" class="nav-item trigger-chan nav-next"&gt;&lt;span&gt;&lt;span class="trigger-cntr"&gt;Second Level Parent&lt;/span&gt;&lt;/span&gt;&lt;/a&gt; &lt;ul class="nav-ls nav-hidden"&gt; &lt;li&gt;&lt;a href="#" class="nav-item"&gt;&lt;span&gt;Third Level&lt;/span&gt;&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#" class="nav-item"&gt;&lt;span&gt;Third Level&lt;/span&gt;&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li&gt;&lt;a href="#" class="nav-item"&gt;&lt;span&gt;Second Level&lt;/span&gt;&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li&gt;&lt;a href="#" class="nav-item trigger-chan nav-next"&gt;&lt;span&gt;&lt;span class="trigger-cntr"&gt;First Level Parent&lt;/span&gt;&lt;/span&gt;&lt;/a&gt; &lt;!-- 2nd level of navigation. --&gt; &lt;ul class="nav-l2 nav-hidden"&gt; &lt;li&gt;&lt;a href="#" class="nav-item"&gt;&lt;span&gt;Overview&lt;/span&gt;&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#" class="nav-item trigger-chan nav-next"&gt;&lt;span&gt;&lt;span class="trigger-cntr"&gt;Second Level Parent&lt;/span&gt;&lt;/span&gt;&lt;/a&gt; &lt;!-- 3rd level of navigation. --&gt; &lt;ul class="nav-ls nav-hidden"&gt; &lt;li&gt;&lt;a href="#" class="nav-item"&gt;&lt;span&gt;Third Level&lt;/span&gt;&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#" class="nav-item"&gt;&lt;span&gt;Third Level&lt;/span&gt;&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#" class="nav-item"&gt;&lt;span&gt;Third Level&lt;/span&gt;&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li&gt;&lt;a href="#" class="nav-item"&gt;&lt;span&gt;Second Level&lt;/span&gt;&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#" class="nav-item"&gt;&lt;span&gt;Second Level&lt;/span&gt;&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;/ul&gt; </code></pre> <p><strong>Sample XML (The format of the initial data feed):</strong></p> <pre><code>&lt;data&gt; &lt;folders level="1"&gt; &lt;folder clickable="Y" url="/lorem/ipsum.html" name="Lorem Ipsum"/&gt; &lt;folder clickable="Y" url="/level/one.html" name="Level One"/&gt; &lt;folder clickable="Y" url="/foo/bar.html" name="Foo Bar"&gt; &lt;folders level="2"&gt; &lt;folder clickable="Y" url="/level/two.html" name="Level two"/&gt; &lt;folder clickable="Y" url="/child/item.html" name="Child Item"&gt; &lt;folders level="3"&gt; &lt;folder clickable="Y" url="/child/child/item.html" name="Child's Child Item"&gt; &lt;folders level="4"&gt; &lt;folder clickable="Y" url="/destiny/child/item.html" name="Destiny's Child"/&gt; &lt;/folders&gt; &lt;/folder&gt; &lt;/folders&gt; &lt;/folder&gt; &lt;/folders&gt; &lt;/folder&gt; &lt;/folders&gt; &lt;/data&gt; </code></pre> <p><strong>XSL (What we need to transform the XML):</strong></p> <pre><code> &lt;?xml version="1.0" encoding="ISO-8859-1"?&gt; &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output method="html" omit-xml-declaration="yes" indent="yes"/&gt; &lt;xsl:template match="/"&gt; &lt;xsl:choose&gt; &lt;xsl:when test="/data/folders"&gt; &lt;!-- NAVIGATION BEGINS HERE --&gt; &lt;ul class="nav-l1"&gt; &lt;!-- LEVEL 1 --&gt; &lt;xsl:for-each select="/data/folders[@level=1]/folder[not (@clickable ) or @clickable ='Y' ]"&gt; &lt;li&gt; &lt;xsl:if test="@selected='Y'"&gt; &lt;xsl:attribute name="class"&gt;nav-active&lt;/xsl:attribute&gt; &lt;/xsl:if&gt; &lt;a href="{@url}" class="nav-item"&gt; &lt;xsl:choose&gt; &lt;xsl:when test="child::*"&gt; &lt;xsl:attribute name="class"&gt;trigger-chan nav-next&lt;/xsl:attribute&gt; &lt;span&gt; &lt;span class="trigger-cntr"&gt; &lt;xsl:value-of select="@name"/&gt; &lt;/span&gt; &lt;/span&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;span&gt;&lt;xsl:value-of select="@name" /&gt;&lt;/span&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/a&gt; &lt;!-- LEVEL 2 --&gt; &lt;xsl:choose&gt; &lt;xsl:when test="child::*"&gt; &lt;ul class="nav-l2 nav-hidden"&gt; &lt;xsl:for-each select="folders[@level=2]/folder[not (@clickable ) or @clickable ='Y' ]"&gt; &lt;li&gt; &lt;xsl:if test="@selected='Y'"&gt; &lt;xsl:attribute name="class"&gt;nav-active&lt;/xsl:attribute&gt; &lt;/xsl:if&gt; &lt;a href="{@url}" class="nav-item"&gt; &lt;xsl:choose&gt; &lt;xsl:when test="child::*"&gt; &lt;xsl:attribute name="class"&gt;trigger-chan nav-next&lt;/xsl:attribute&gt; &lt;span&gt; &lt;span class="trigger-cntr"&gt; &lt;xsl:value-of select="@name"/&gt; &lt;/span&gt; &lt;/span&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;span&gt;&lt;xsl:value-of select="@name" /&gt;&lt;/span&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/a&gt; &lt;!-- LEVEL 3 and beyond ... --&gt; &lt;xsl:apply-templates /&gt; &lt;/li&gt; &lt;/xsl:for-each&gt; &lt;/ul&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/li&gt; &lt;/xsl:for-each&gt; &lt;/ul&gt; &lt;/xsl:when&gt; &lt;/xsl:choose&gt; &lt;/xsl:template&gt; &lt;!-- Infinity and beyond (=&gt; Level 3) --&gt; &lt;xsl:template name="folder"&gt; &lt;ul class="nav-ls nav-hidden"&gt; &lt;li&gt; &lt;xsl:if test="@selected='Y'"&gt; &lt;xsl:attribute name="class"&gt;nav-active&lt;/xsl:attribute&gt; &lt;/xsl:if&gt; &lt;a href="{@url}" class="nav-item"&gt; &lt;xsl:choose&gt; &lt;xsl:when test="child::*"&gt; &lt;xsl:attribute name="class"&gt;trigger-chan nav-next&lt;/xsl:attribute&gt; &lt;span&gt; &lt;span class="trigger-cntr"&gt; &lt;xsl:value-of select="@name"/&gt; &lt;/span&gt; &lt;/span&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;span&gt;&lt;xsl:value-of select="@name" /&gt;&lt;/span&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/a&gt; &lt;xsl:apply-templates select="folders[@level&gt;3]/folder" /&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>Any help is greatly appreciated. </p> <p>Thanks!</p>
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    1. COWhy do you think there anything wrong with the code? Are there errors? Is the output wrong?
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    2. COThere's no recursion after nav level 2, the output is non existent after level 2, and I can't figure out how to apply the recursion. I feel like this should be easier but my skills in XSL are not that great. Why the downvote?
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    3. COI didn't downvote, but I presume its because the problem wasn't clear in the initial question. Edit your comment in and it should probably go away.
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