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RE: Conditional Assigining
- To: <xsl-list at lists dot mulberrytech dot com>
- Subject: RE: [xsl] Conditional Assigining
- From: "Michael Kay" <mhkay at iclway dot co dot uk>
- Date: Wed, 16 May 2001 17:15:17 +0100
- Reply-To: xsl-list at lists dot mulberrytech dot com
>
> <xsl:variable name="ID">-1</xsl:variable>
> <xsl:for-each select="Section[parentID='0']">
> <xsl:if test="$ID=-1">
> <xsl:variable name="ID" select="sectionID" />
> </xsl:if>
> id <xsl:value-of select="$ID"/>
>
XSLT isn't a sequential programming language, you are trying to use it as if
it were. You can't do things in one iteration of xsl:for-each that affect
subsequent iterations, because there is no such thing as "subsequent" in a
non-sequential language. (See my XSLT Programmer's Reference for an essay on
the subject...)
Instead you want something like
<xsl:for-each select="Section[parentID='0']">
<xsl:choose>
<xsl:when test="preceding-sibling::Section[parentID='0']">
<xsl:value-of select="preceding-sibling::Section[parentID='0'][1]"/>
</xsl:when>
<xsl:otherwise>-1</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
That works because it expresses the output as a function of the input.
Mike Kay
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list