Dynamically pass variable name from another variable in XSLT

Question

I have list of Variables defined and imported in current XSL.

 $varA --> 10
 $varB --> 20
 $varC --> 30

In current XSL, I get value of 'varA' or 'varB' or 'varC' dynamically and keep in variable called 'VarDynamic' ${$VarDynamic} is not working as expected. I have to pass dynamically variable name from another variable

VariableList.xsl

 <xsl:variable name="varA" select="10"></xsl:variable>
 <xsl:variable name="varB" select="20"></xsl:variable>
 <xsl:variable name="varC" select="30"></xsl:variable>

DynamicList.xsl

  <xsl:import href="VariableList.xsl"/>
  <xsl:template match="/">
  <xsl:variable name="DynamicVar">
      <xsl:choose>
          <xsl:when test="/A">
              <xsl:value-of select="'varA'"/>
          </xsl:when>
          <xsl:when test="/B">
              <xsl:value-of select="'varB'"/>
          </xsl:when>
          <xsl:otherwise>
              <xsl:value-of select="'varC'"/>
          </xsl:otherwise>
      </xsl:choose>
  </xsl:variable>

  <Result>
      <xsl:value-ofselect="${$DynamicVar}"/>
  </Result>

Can you please advise on this.

You can't do that in XSLT. What exactly is the problem you are trying to solve? — Nic Gibson
– Nic Gibson, Commented May 27, 2014 at 20:44

michael.hor257k · Accepted Answer · 2014-05-27 22:00:31Z

3

You have some serious syntax issues here, otherwise it would work. Try it this way:

VariableList.xsl

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:variable name="varA" select="10"></xsl:variable>
    <xsl:variable name="varB" select="20"></xsl:variable>
    <xsl:variable name="varC" select="30"></xsl:variable>
</xsl:stylesheet>

DynamicList.xsl

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:import href="VariableList.xsl"/>
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>

<xsl:template match="/">
    <xsl:variable name="DynamicVar">
        <xsl:choose>
            <xsl:when test="/A">
                <xsl:value-of select="$varA"/>
            </xsl:when>
            <xsl:when test="/B">
                <xsl:value-of select="$varB"/>
            </xsl:when>
            <xsl:otherwise>
                <xsl:value-of select="$varC"/>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:variable>
    <Result>
        <xsl:value-of select="$DynamicVar"/>
    </Result>
</xsl:template>

</xsl:stylesheet>

Edit:

If you must do it by indirection, then try:

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>

<xsl:template match="/">
    <xsl:variable name="DynamicVar">
        <xsl:choose>
            <xsl:when test="/A">
                <xsl:value-of select="'varA'"/>
            </xsl:when>
            <xsl:when test="/B">
                <xsl:value-of select="'varB'"/>
            </xsl:when>
            <xsl:otherwise>
                <xsl:value-of select="'varC'"/>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:variable>
    <Result>
        <xsl:value-of select="document('VariableList.xsl')/xsl:stylesheet/xsl:variable[@name=$DynamicVar]/@select"/>
    </Result>
</xsl:template>

</xsl:stylesheet>

Note that import is not required here. Actually, the VariableList.xsl document could be a simple XML document.

edited May 27, 2014 at 22:00

answered May 27, 2014 at 21:15

michael.hor257k

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3 Comments

Isaac G Sivaa Over a year ago

Hi. I would like to read variable name from another variable. This is straight forward.

michael.hor257k Over a year ago

@SivaaNethaji Do you mean you want to take the variable's name as text and get the variable's value from that? Why would you go that route? It's not straightforward at all.

Isaac G Sivaa Over a year ago

Thanks :) For some reason I have to keep XSL file with variable name. Your solution works here. Thanks :)

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