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Dynamic Filter Menus
- To: XSL-List at lists dot mulberrytech dot com
- Subject: [xsl] Dynamic Filter Menus
- From: brian dot witgen at marconi dot com
- Date: Fri, 26 Oct 2001 08:41:51 -0500
- Reply-To: xsl-list at lists dot mulberrytech dot com
I am trying to take a list of entries like such:
<entry date="Fri Wed Sep 26 06:57:55 CDT 2001"
vendor="newmanufacturer"
category="gorycat2"
version="2.9"
title="First line of info."
description="Last line you'll see.">
</entry>
<entry date="Mon Wed Sep 26 06:57:55 CDT 2001"
vendor="testingamaker"
category="printers"
version="3.4"
title="print me a file."
description="now go get it.">
</entry>
<entry date="Fri Wed Sep 26 06:57:55 CDT 2001"
vendor="newmanufacturer"
category="gorycat3"
version="2.9"
title="Second of info."
description="First line you'll see.">
</entry>
....and with those entries, I have created 3 keys based on the vendor, category, and version:
<xsl:key name="venkey" match="entry" use="@vendor" />
<xsl:key name="catkey" match="entry" use="@category" />
<xsl:key name="verkey" match="entry" use="@version" />
The menus are a unique list of the vendors, categories, or versions to
select. I dont have any probelm with getting the initial unique list when
no filters have been selected yet. I am trying to make the menus work in
such a way that when one filter is selected, the other two menus that do
not have a filter selected will show a unique list of only those values
that match the selected filter.
Example: With the entries above, if I choose version 2.9 as a filter, then
only "newmanufacturer" will show up in the vendor menu (once being unique)
and "gorycat2" and "gorycat3" will both show up in the category menu.
I have an xml file that is updated with the selected filter for each menu
through javascript and pulled into the template as parameters:
<xsl:call-template name="filtermenus">
<xsl:with-param name="pven" select="/docs/vendorfilter" />
<xsl:with-param name="pcat" select="/docs/categoryfilter" />
<xsl:with-param name="pver" select="/docs/versionfilter" />
</xsl:call-template>
Here is a snippet of what I am using now for one of the menus:
<xsl:variable name="uven" select="entry[generate-id() = generate-id(key('venkey', @vendor)[1])]"/>
<xsl:variable name="ucat" select="entry[generate-id() = generate-id(key('catkey', @category)[1])]"/>
<xsl:variable name="uver" select="entry[generate-id() = generate-id(key('verkey', @version)[1])]"/>
<select name="filterbyvendor" style="width: 90pt">
<xsl:if test="$pven!='No-Filter'">
<option>No-Filter</option>
<option selected="selected"><xsl:value-of select="$pven" /></option>
</xsl:if>
<xsl:if test="$pven='No-Filter'">
<option selected="selected">No-Filter</option>
<xsl:choose>
<xsl:when test="$pcat!='No-Filter' and $pver='No-Filter'">
<xsl:for-each select="$uven">
<xsl:sort select="@vendor" />
<xsl:for-each select="key('venkey', @vendor)">
<xsl:variable name="test" select="boolean(key('venkey', @vendor) and @category=$pcat)" />
<xsl:if test="$test='true'">
<option><xsl:value-of select="@vendor"/></option>
</xsl:if>
</xsl:for-each>
</xsl:for-each>
</xsl:when>
<xsl:when test="$pcat='No-Filter' and $pver!='No-Filter'">
<xsl:for-each select="$uven">
<xsl:sort select="@vendor" />
<xsl:for-each select="key('venkey', @vendor)">
<xsl:variable name="test" select="boolean(key('venkey', @vendor) and @version=$pver)" />
<xsl:if test="$test='true'">
<option><xsl:value-of select="@vendor"/></option>
</xsl:if>
</xsl:for-each>
</xsl:for-each>
</xsl:when>
<xsl:when test="$pcat!='No-Filter' and $pver!='No-Filter'">
<xsl:for-each select="$uven">
<xsl:sort select="@vendor" />
<xsl:for-each select="key('venkey', @vendor)">
<xsl:variable name="test" select="boolean(key('venkey', @vendor) and @category=$pcat and @version=$pver)" />
<xsl:if test="$test='true'">
<option><xsl:value-of select="@vendor"/></option>
</xsl:if>
</xsl:for-each>
</xsl:for-each>
</xsl:when>
<xsl:otherwise>
<xsl:for-each select="$uven">
<xsl:sort select="@vendor" />
<option><xsl:value-of select="
@vendor"/></option>
</xsl:for-each>
</xsl:otherwise>
</xsl:choose>
</xsl:if>
</select>
</td>
<td align="center">
The problem arises from the two xsl:foreach statements in each xsl:when. If
I only use the outer xsl:foreach which selects the list of unique vendors,
then the boolean test will only put a vendor in the menu if it is true for
the first vendor in each group (which is how we got the unique value in the
first place). When I put the second xsl:foreach statement in which selects
every entry in the vendor group that the outer xsl:foreach is on at that
point in the loop, then it won't give me a unique menu list. I have tried
using "count" in different ways, using variables, parameters, etc, and I
always end up back in the same situation. Does anyone have any idea how to
fix one loop or the other?
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