给定具有日期属性的元素列表,例如,
<foo> <bar date="2001-04-15"/> <bar date="2002-01-01"/> <bar date="2005-07-04"/> <bar date="2010-11-10"/> </foo>
我想使用XSLT检索最接近但不在给定日期之后的元素.
使用参数“2008-01-01”调用此函数应打印< bar date =“2005-07-04”>.假设上下文节点已经是< foo>.
解决方法
这是一个XSLT 2.0选项……
XML输入
<foo> <bar date="2001-04-15"/> <bar date="2005-07-04"/> <bar date="2002-01-01"/> <bar date="2010-11-10"/> </foo>
XSLT 2.0
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xsl:output indent="yes"/> <xsl:strip-space elements="*"/> <xsl:param name="threshold" select="xs:date('2008-01-01')"/> <xsl:template match="@*|node()"> <xsl:copy> <xsl:apply-templates select="@*|node()"/> </xsl:copy> </xsl:template> <xsl:template match="foo"> <xsl:variable name="closestDate" as="node()*"> <xsl:apply-templates select="bar[$threshold >= xs:date(@date)]"> <xsl:sort select="@date" data-type="text"/> </xsl:apply-templates> </xsl:variable> <xsl:copy-of select="$closestDate[last()]"/> </xsl:template> </xsl:stylesheet>
XML输出
<bar date="2005-07-04"/>
“foo”模板的说明……
<xsl:template match="foo"> <!--First a variable named 'closestDate' is created by doing an 'xsl:apply-templates' to all 'bar' elements that have a '@date' attribute that is less than or equal to the 'threshold' parameter (which is '2008-01-01' in the example). Notice that both '@date' and '$threshold' are cast as 'xs:date' so that the date comparison will work correctly. Also,we use the 'as="node()*"' attribute to cast the variable as zero or more nodes() so that each individual 'bar' can be accessed individually.--> <xsl:variable name="closestDate" as="node()*"> <xsl:apply-templates select="bar[$threshold >= xs:date(@date)]"> <!--This 'xsl:sort' is used to put all the 'bar' elements in order based on the '@date' attribute.--> <xsl:sort select="@date" data-type="text"/> </xsl:apply-templates> </xsl:variable> <!--What we end up with for the 'closestDate' variable is this: <bar date="2001-04-15"/> <bar date="2002-01-01"/> <bar date="2005-07-04"/> In the following 'xsl:copy-of',we choose the last node in 'closestDate'.--> <xsl:copy-of select="$closestDate[last()]"/> </xsl:template>
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