用户xsl：call-template，值xsl：param

Question

I'm working on some utility xslt templates and I would like to make a template in which you can call another template based on a parameter.

What I want to achieve:

<xsl:template name="OuterTemplate.AlternatingRow">
    <xsl:param name="Position" />
    <xsl:param name="CallTemplate" />
    <xsl:if test="$Position mod 2 = 0">
        <xsl:if test="$CallTemplate != ''">
            <xsl:call-template name="$CallTemplate"></xsl:call-template>
        </xsl:if>
    </xsl:if>
</xsl:template>

But I keep getting errors as <xsl:call-template name="$CallTemplate"></xsl:call-template> isn't an allowed action.

Is this even possible? Couldn't find much about this when googling.

Answer 1

根据XSLT规范， <xsl:call-template>的name属性必须是文字qname，它不能是诸如变量引用之类的表达式。

Answer 2

While the accepted answer of Ian Roberts is correct, it is possible in XSLT 1.0 and in XSLT 2.0 to simulate passing a "function" (template) as a parameter to another function .

This has been done in the FXSL library for functional programming with XSLT (1.0 and 2.0).

You can read more about the underlying, main idea of FXSL here (for XSLT 2.0): http://conferences.idealliance.org/extreme/html/2006/Novatchev01/EML2006Novatchev01.html

And for XSLT 1.0 here: http://conferences.idealliance.org/extreme/html/2003/Novatchev01/EML2003Novatchev01.html

The idea is that instead of a template name, we are passing as parameter a node (say $pFun ) that is uniquely matched by a template that implements the wanted functionality. Thenn in the called template the following invokes the "passed as parameter" template:

<xsl:apply-templates select="$pFun">
 <!-- Any necessary <xsl:with-param> here -->
</xsl:apply-templates>

Answer 3

XSLT的动态发送机制是xsl：apply-templates，您可以在Dimitre Novatchev的FXSL库中找到巧妙的方法来构建此功能。