Re: [xsl] Error when params are in Xpath expression

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

Dmitri,

At 07:06 AM 5/12/2009, you wrote:
> <!-- get translation of a string -->
>     <xsl:template name="translateString">
>         <xsl:param name="str" select="'recent_albums'"/>
>         <xsl:param name="toLang"/>
>         <xsl:param name="fallback" select="'en'"/>
>
>         <xsl:choose>
>             <xsl:when test="true()">
>
>                                 <xsl:value-of
> select="document('')/*/trans:tr/tr_string[@str=$str]/$toLang"/>
>             </xsl:when>
>             <xsl:otherwise>
>                 <xsl:value-of select="'not found'"/>
>             </xsl:otherwise>
>         </xsl:choose>
>     </xsl:template>
>
>
> I get errors when running this template.
> If I manually replace the $str and $toLang, then I am getting the
> correct result.
>
> <xsl:value-of 
> select="document('')/*/trans:tr/tr_string[@str='recent_images']/ru"/>
>
> What is wrong with my syntax that uses params? Are params allowed in
> Xpath expression?

Only the "/$toLang" step will give the error.

You have a couple of options. You could fall back on name testing, 
and use the step "/*[name()=$toLang]".

If you find that cumbersome (and some of us do), you could remodel 
somewhat. Instead of using 'de', 'fr', 'en' and so forth as element names:

<de>Halt<de>
<fr>Arretez</fr>
<en>Stop</en>

you could reduce them to values on attributes:

<str lang="de">Halt</str>
<str lang="fr">Arretez</str>
<str lang="en">Stop</str>

In this case you could have

document('')/*/trans:tr/tr_string[@str=$str]/*[@lang=$toLang]"

I hope that helps,
Wendell



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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
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Suite 207                                          Phone: 301/315-9631
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