Using param value in xpath

jose.jeria · Jul 6, 2005

I have the following
Code:

<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl

utput method="html" indent="yes" encoding="UTF-8"/>
<xsl

aram name="myvar"/>

<xsl:template match="/">
<html>
<body>
<xsl:for-each select="strings/$myvar">
<p><xsl:value-of select="."/></p>
</xsl:for-each>

</body>
</html>
</xsl:template>

</xsl:stylesheet>

What i want to do is to use the $myvar in the xpath expression. Its
marked in bold, but that gives me an error. I tried the concat
function, but that did also didnt work. What am I doing wrong?

Joris Gillis · Jul 6, 2005

Hi,

What i want to do is to use the $myvar in the xpath expression. Its
marked in bold, but that gives me an error. I tried the concat
function, but that did also didnt work. What am I doing wrong?

Variables or parameters cannot be used in XSLT to dynamically make xpath expression.

You could use an extension function. e.g http://www.exslt.org/dyn/functions/evaluate/index.html

But I certainly wouldn't to that myself to solve your specific problem. Simple use:

'strings/*[local-name()=$myvar]'

or the lightening fast key equivalent:

<xsl:key name="node" match="strings/*" use="local-name()"/>

<xsl:template match="/">
<html>
<body>
<xsl:for-each select="key('node',$myvar)">
<p><xsl:value-of select="."/></p>
</xsl:for-each>
</body>
</html>
</xsl:template>

regards,

Martin Honnen · Jul 6, 2005

<xslaram name="myvar"/>

<xsl:for-each select="strings/$myvar">

What i want to do is to use the $myvar in the xpath expression. Its
marked in bold, but that gives me an error. I tried the concat
function, but that did also didnt work. What am I doing wrong?

There is no dynamic XPath expression evaluation, what you have is not
syntactically correct.
It is hard to tell you what to use instead as I have no idea what you
want to achieve, you have not provided any information what type of
value you set the variable to.
If you have for instance a variable/param of type string with an element
name and you want to select elements with that name then
<xsl:for-each select="strings/*[name() = $myvar]">
might do what you want.

jose.jeria · Jul 6, 2005

Thanks Joris and Martin,

that was exactly what i was looking for.

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Using param value in xpath

jose.jeria

Joris Gillis

Martin Honnen

jose.jeria

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