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Re: optimization choose - then same call-template
Subject: Re: optimization choose - then same call-template
From: Joerg Heinicke <joerg.heinicke@xxxxxx>
Date: Sun, 26 Jan 2003 14:06:30 +0100
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Hello Hans,
there is one possibility, which is maybe more difficult to maintain, but
is much shorter:
<xsl:value-of select="$title[$title != ''] | $title2['pseudocode: if
second condition true'] | $title3['pseudo: if 3rd true'] | $default-value"/>
But there are some aspects:
1. The selected value will generally be the first in document order, not
the first in the select statement. You won't get the hard and exclusive
order of <xsl:choose/>, <xsl:when/>, <xsl:otherwise/>.
2. It will only work with node-sets, not with strings. So instead of
testing on $title, you will need the expression used in your variable
$title:
<xsl:value-of select="$pathNode[.=$df]/../@title[normalize-space()] |
$expression2['pseudo: if true'] | $pathProperties/df[@name=$df]"/>
It's maybe a bit hard to understand. But you only have one <xsl:when/>
in your example, so I can't give you a better example.
Of course instead of <xsl:value-of/> you can use <xsl:variable/>, but
you will get all nodes, for which the evaluation is true. This means you
always get the default node too. So you must change it a bit:
<xsl:variable name="title" select="(like select above)[1]"/>
Hope this helps a bit.
Regards,
Joerg
<!-- the three parameters are inititialized from other template rule, which applies this rule for node df >
<xsl:template match="df">
<xsl:param name="pathNode"/>
<xsl:param name="pathProperties"/>
<xsl:param name="df" select="@name"/>
<!-- select attribute title from xml-source with normalizing (delete)white-space-->
<xsl:variable name="title" select="normalize-space($pathNode[.=$df]/../@title)"/>
<xsl:choose>
<!-- test if title from xml-source is not empty (exist and contains more than white-space)-->
<xsl:when test="$title != '' "><!-- Label --><xsl:value-of select="$title"/>
<xsl:call-template name="df">
<!-- insert title from xml-source and pass parameters to generic template for generation of datafields -->
<xsl:with-param name="thisTitle" select="$title"/>
<xsl:with-param name="thisName" select="$df"/>
<xsl:with-param name="thisPath" select="$pathNode[.=$df]/../."/>
<xsl:with-param name="dfProperties" select="$pathProperties/df[@name=$df]"/>
</xsl:call-template>
</xsl:when>
<!-- title from xml-properties -->
<xsl:otherwise>
<!-- Label --><xsl:value-of select="$pathProperties/df[@name=$df]"/>
<xsl:call-template name="df">
<!-- insert title from xml-properties and pass same parameters as above to generic template for generation of datafields -->
<xsl:with-param name="thisTitle" select="$pathProperties/df[@name=$df]"/>
<xsl:with-param name="thisName" select="$df"/>
<xsl:with-param name="thisPath" select="$pathNode[.=$df]/../."/>
<xsl:with-param name="dfProperties" select="$pathProperties/df[@name=$df]"/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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