Compare parent's attribute with grand parent's one

scubaduba · November 29th, 2004, 05:40 AM

Hi,

I wanted to compare an element's parent's name attribute with it's grand parent's name attribute. If they match I wanted to print something. The XPath query I used is this, but apparently it didn't work:

<xsl:when test="..[@name]=../..[@name]">
Edit: I see now that it is a wrong syntax.

Here is my XML structure:
<RootElement>
<Groups name='top1'>
  <Group name='sub1'>
    <Groups name='sub1'>
        <Group name="sub1ofsub1"/>
        <Group name="sub2ofsub1"/>
        <Group name="sub3ofsub1"/>
    </Groups>
  <Group>
<Groups>
</RootElement>

I can achieve my goal with defining variables for name attributes and comparing them, but if there is a Xpath structure I can use I'd prefere one line code rather than variables.

Thanks in advance.

EDIT: I thought it would be easy to do what I want with variables but I wasn't even able to do that. There is no runtime variable assignment in XSL, which makes things harder.
Here is the XSL structure I tried to get values ( I assume I'm in one of the inner Group elements):

<xsl:template match="Group">
<xsl:variable name="parentsname">
   <xsl:value-of select="..[name()='Groups']/[@name]"/>
</xsl:variable>

<xsl:variable name="grandparentsname">
  <xsl:value-of select="..[name()='Groups']/..[name()='Group']/[@name]"/>
</xsl:variable>

</xsl:template>

so far I wasn't able to make it work.

joefawcett · November 29th, 2004, 07:57 AM

I think you need the curent function in your test:

Code:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" method="xml"/>
<xsl:template match="/">
  <results>
    <xsl:apply-templates/>
  </results>
</xsl:template>

<xsl:template match="*">
  <xsl:value-of select="name()"/><xsl:text>#x9;</xsl:text>
  <xsl:value-of select="../@name"/><xsl:text>#x9;</xsl:text>
  <xsl:value-of select="../../@name"/><xsl:text>#xd;</xsl:text>
  <xsl:choose>
    <xsl:when test="../@name = current()/../../@name">Parent @ name is equal to grandparent @ name</xsl:when>
    <xsl:otherwise>Parent @ name is not equal to grandparent @ name</xsl:otherwise>
  </xsl:choose>
  <xsl:text>#xd;*****************************#xd;</xsl:text>
  <xsl:apply-templates/>
</xsl:template>
</xsl:stylesheet>

--

Joe (Microsoft MVP - XML)

barcher · November 29th, 2004, 12:20 PM

current() should not be required as both sides of the test will use the current context anyway.

<xsl:if test="../@name=../../@name">using shorthand</xsl:if>
<xsl:if test="parent::*/@name=ancestor::*[2]/@name">using axis</xsl:if>

Regards
Bryan

joefawcett · November 29th, 2004, 12:26 PM

Too right, I changed horses midstream and forgot it was no longer needed :)

Code:

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" method="xml"/>
<xsl:template match="/">
  <results>
    <xsl:apply-templates/>
  </results>
</xsl:template>

<xsl:template match="*">
  <xsl:value-of select="name()"/><xsl:text>#x9;</xsl:text>
  <xsl:value-of select="../@name"/><xsl:text>#x9;</xsl:text>
  <xsl:value-of select="../../@name"/><xsl:text>#xd;</xsl:text>
  <xsl:choose>
    <xsl:when test="../@name = ../../@name">Parent @name is equal to grandparent @name</xsl:when>
    <xsl:otherwise>Parent @name is not equal to grandparent @name</xsl:otherwise>
  </xsl:choose>
  <xsl:text>#xd;*****************************#xd;</xsl:text>
  <xsl:apply-templates/>
</xsl:template>
</xsl:stylesheet>

--

Joe (Microsoft MVP - XML)