Re: [xsl] Evaluating a variable as part of XPath Query

[Joerg Heinicke <joerg.heinicke@xxxxxx>]

Hello Alan,

Alan Flaherty wrote:
> Hi List,
>
> I'm trying to use xslt to generate a number of controls for a page on a
> website but some of the controls will need "referenced" values which are
> found in the source xml file itself, these referenced values will always
> be found in the settings section of the xml definition file, how can I
> generate an XPath expression like so:
>
> propertyPage/settings/elementId/text() 
>
> when 'elementId' is passed as the reference required from the xml file
> to the xslt file, see below marked !!!Problem area!!! 
>
> In the samples below the method is (trying to be) used to generate the
> full src of an iframe, some of the values the iframe page requires are
> in the xml definition file
>
> Settings section of xml file:
> <propertyPage title="" tabHeight="400" tabWidth="380">
> 	<settings>
> 		<elementType>product</elementType>
> 		<elementId>-1</elementId>
> 	</settings>
>
> ....
>
> Definition for iframe control:
> <control type="iframe" title="General" x="5" y="5" w="290" h="140">
> 	<attributes src="iframe/Image.aspx">
> 		<param type="val" name="ImageType" value="FabricColor"/>
> 		<param type="property" name="ElementId"
> value="elementId"/>
> 	</attributes>
> </control>
>
>
> Xslt 
> <xsl:variable name="src">
> <xsl:value-of select="concat(attributes/@src,'?')" />
> 	<xsl:for-each select="attributes/param">
> 		<xsl:choose>
> 			<xsl:when test="string(@type)='property'">
> 				<xsl:value-of select="@name" />
> 				=
>
>
> !!!! Problem Area, Looks like I misunderstood the meaning of
> msxsl:node-set !!! 
>
> <xsl:value-of select="//settings/msxsl:node-set(@value)/text()"/>

<xsl:value-of select="//settings/*[name() = current()/@value]/text()"/>

This is possible only for one level in an XPath expression. For multiple 
levels like

<xsl:variable name="part-of-expr" select="test/test"/>
<xsl:value-of select="//foo/$part-of-expr/bar"/>

is *not* possible. Some processors have an extension function evaluate() 
for such requirements.
Example usage: <xsl:value-of select="xx:evaluate('//foo/' + 
$part-of-expr + '/bar')"/>.

Regards,

Joerg

> 			</xsl:when>
> 			<xsl:otherwise>
> 				<xsl:value-of select="@name"
> />=<xsl:value-of select="@value"/>
> 			</xsl:otherwise>
> 		</xsl:choose>
> 		<xsl:if test="following-sibling::node()">
> 			<xsl:text><![CDATA[&]]></xsl:text>
> 		</xsl:if>
> 	</xsl:for-each>
> </xsl:variable>
>
>
>
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list


XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list