I'm having issues with xsl:variable
. I want to create a variable with a value that depends on the value of another XML node attribute. This working good. But when I try to create a variable with a string value that represents XPath, it just doesn't work when I try to use it as XPath in a later XSL tag.
<xsl:variable name="test">
<xsl:choose>
<xsl:when test="node/@attribute=0">string/represent/xpath/1</xsl:when>
<xsl:otherwise>string/represent/xpath/2</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:for-each select="$test">
[...]
</xsl:for-each>
I tried: How to use xsl variable in xsl if and trouble with xsl:for-each selection using xsl:variable. But with no results.
XSLT <xsl:variable>The <xsl:variable> element is used to declare a local or global variable. Note: The variable is global if it's declared as a top-level element, and local if it's declared within a template. Note: Once you have set a variable's value, you cannot change or modify that value!
The content model of both elements is the same. The way these elements declare variables is the same. However, the value of the variable declared using <xsl:param> is only a default that can be changed with the <xsl:with-param> element, while the <xsl:variable> value cannot be changed.
XSLT current() Function Usually the current node and the context node are the same. However, there is one difference. Look at the following XPath expression: "catalog/cd". This expression selects the <catalog> child nodes of the current node, and then it selects the <cd> child nodes of the <catalog> nodes.
Dynamic evaluation of an XPath expression is generally not supported in XSLT (both 1.0 and 2.0), however:
We can implement a rather general dynamic XPath evaluator if we only restrict each location path to be an element name:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:param name="inputId" select="'param/yyy/value'"/>
<xsl:variable name="vXpathExpression"
select="concat('root/meta/url_params/', $inputId)"/>
<xsl:template match="/">
<xsl:value-of select="$vXpathExpression"/>: <xsl:text/>
<xsl:call-template name="getNodeValue">
<xsl:with-param name="pExpression"
select="$vXpathExpression"/>
</xsl:call-template>
</xsl:template>
<xsl:template name="getNodeValue">
<xsl:param name="pExpression"/>
<xsl:param name="pCurrentNode" select="."/>
<xsl:choose>
<xsl:when test="not(contains($pExpression, '/'))">
<xsl:value-of select="$pCurrentNode/*[name()=$pExpression]"/>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="getNodeValue">
<xsl:with-param name="pExpression"
select="substring-after($pExpression, '/')"/>
<xsl:with-param name="pCurrentNode" select=
"$pCurrentNode/*[name()=substring-before($pExpression, '/')]"/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
when this transformation is applied on this XML document:
<root>
<meta>
<url_params>
<param>
<xxx>
<value>5</value>
</xxx>
</param>
<param>
<yyy>
<value>8</value>
</yyy>
</param>
</url_params>
</meta>
</root>
the wanted, correct result is produced:
root/meta/url_params/param/yyy/value: 8
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