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Matt AdamsSubject: How to return values from sub-templates ?
Author: Matt Adams
Date: 01 Dec 2004 05:32 AM
Sorry for this newbie question but I didn't found a hint in tutorials on how to return
back parameter values from sub-templates. Assume the following situation.
I want to pass back the boolean (or other values in other scenarios) value if the attribute "age"
exists in a node "myelement" with the attribute name="karl".

Yes, I know, THIS sample could be coded easier within
one template but my sample is only a simplified version for a complex scenario
where two templates are required.

Again, how can I access the value of the variable myval from the calling template?

Thank you
Matt

<xsl:template match="/">
<xsl:call-template name="subtemp">
<xsl:with-param name="parm" select="//myelement[@name = 'karl']" />
</xsl:call-template>
Age exists=<xsl:value-of select="$myval" /> <!-- does not work -->
</xsl:template>

<xsl:template name="subtemp">
<xsl:param name="parm" />
Hello
<xsl:variable name="myval" select="exist(@age)" />
return $myval
</xsl:template>
Posttop
James DurningSubject: How to return values from sub-templates ?
Author: James Durning
Date: 02 Dec 2004 07:03 PM
Templates only pass back the value, not any variables. But, you can return nodes within the return value eg.
<xsl:template name="subtemp">
<xsl:param name="parm" />
Hello
<xsl:variable name="myval" select="exist(@age)" />
<xsl:value-of select="$myval"/>
</xsl:template>
However, this would combine Hello, with the other return value.

You could put the return value in a element eg.
<xsl:template name="subtemp">
<xsl:param name="parm" />
Hello
<xsl:variable name="myval" select="exist(@age)" />
<result><xsl:value-of select="$myval"/></result>
</xsl:template>
which would return
Hello<result>myvalue</result>

So you could change your main template to call the template from a variable...:
<xsl:template match="/">
<xsl:variable name="sub">
<xsl:call-template name="subtemp">
<xsl:with-param name="parm" select="//myelement[@name = 'karl']" />
</xsl:call-template>
</xsl:variable>
<xsl:value-of select="$sub"/><!-- outputs 'Hello'/>
Age exists=<xsl:value-of select="$sub/result" /> </xsl:template>

All depends on what you're looking for.
   
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