如何在xsl：choose中使用xsl：variable

Question

Hey I have one xsl variable that I want to use in xsl choose tag

<xsl:template match="/">
    <xsl:choose>
        <xsl:when test="1 eq whatever">
             <xsl:variable name="name" select="Person/Name"/>
        </xsl:when>
    </xsl:choose>
</xsl:template>

It will give exception

javax.xml.transform.TransformerConfigurationException: Could not compile stylesheet
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:828)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:617)
    at com.navaera.sunflower.set.util.XmlElementsBuilder.getXMLOutput(XmlElementsBuilder.java:189)

Answer 1

You are not using the variable name inside xsl:choose - you declare it there.

To declare a variable inside an xsl:when only makes sense if you also make use of this variable inside the same element. This is because of the scope of a variable. If you declare a local variable inside xsl:when , you cannot use it outside.

Using xsl:choose only makes sense if you test at least two different conditions, one inside xsl:when , the other in xsl:otherwise . If there is only one condition, xsl:if will suffice.

If you reveal more of your XSLT stylesheet it might be possible to tell where you went wrong. So, please update your question with a complete input XML and a complete XSLT stylesheet.

EDIT : To make this even clearer: No, it is not possible to use a local variable outside of its scope. If you declare a variable inside xsl:when you'll never be able to access it outside.

Answer 2

you can use a global variable

<xsl:variable name="name" select="Person/Name"/>

and call it inside a template

<xsl:template match="/">
    <xsl:choose>
        <xsl:when test="1 eq whatever">
             <xsl:value-of select="$name"/>
        </xsl:when>
    </xsl:choose>
</xsl:template>

Answer 3

If you ask the question "I want to write + 3 5", you will get the answer "you can't do that, the language doesn't allow it". If you change the question to "I want to add three to five", people will tell you to write "3 + 5". So please explain your problem, and then we can tell you the right way to code it. We can't work out what the problem is by looking at incorrect code.