Question

I m generating a table in a pdf document using xml-fo.
The number of columns is dynamic. Columns are only displayed when tests are passing.
In tests I m using variables like $var1, $var2, ... that point to xml nodes.

我这样说。

 <xsl:element name="fo:table-row">
    <xsl:element name="fo:table-cell" use-attribute-sets="table-cell">
        <xsl:attribute name="number-columns-spanned"> **???** </xsl:element>
        <xsl:element name="fo:block">Text that spans over columns</xsl:element>
    </xsl:element>
 </xsl:element>
 <xsl:element name="fo:table-row" use-attribute-sets="headerRow"> 
    <xsl:element name="fo:table-cell" use-attribute-sets="table-cell">
       <xsl:element name="fo:block">some value here</xsl:element>
    </xsl:element>
    <xsl:if test="$var1">
       <xsl:element name="fo:table-cell" use-attribute-sets="table-cell">
          <xsl:element name="fo:block">maybe some value here 2</xsl:element>
       </xsl:element>
    </xsl:if>
    <xsl:if test="$var2">
       <xsl:element name="fo:table-cell" use-attribute-sets="table-cell">
          <xsl:element name="fo:block">maybe some value here 3</xsl:element>
       </xsl:element>
    </xsl:if>
    ...
</xsl:element>

I m expanding the 1st row to span all over the columns. "number-columns-spanned" is variable and depends on the number of test that are passing.
Is there an easy way to dynamically extract the number of conditions that are passing in order to correctly define the attribute number-columns-spanned?

Answer 1

你们可以通过这样的表述来计算变量的内容:

count($var1 | $var2 | $var3 | ...)

假设你们的每个变量,就是一种可能无法避免的组合。如果您的变量是真实的/虚假的数值,那么你就可以利用XSL中的错误0和真实性(至少使用译员Im):

$var1 + $var2 + $var3 + ...

如果这些数值为t node set and aren t booleans,则首先将其转化成机器人:

boolean($var1) + boolean($var2) + boolean($var3) + ...

这不是处理该问题的非常明智的方法,而是行之有效的。

According to the XPath spec , booleans are actual due to behave this way whenposition to numerics. Good!

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