如何从嵌套循环中访问外部循环中的元素？ [英] How do I access elements from the outer loop from within nested loops?

问题描述

 < xsl：for-each select =/ Root / A > 
< xsl：for-each select =/ Root / B> 
<！ -  Code  - > 
< / xsl：for> 
< / xsl：for> 
  

在内部循环中，如何从外部当前节点访问属性循环？

我一直在发现自己写这样的代码：

 < xsl：for-each select =/ Root / A> 
 < xsl：for-each select =/ Root / B> 
 <！ - 现在可以使用$ someattribute来访问'A'中的数据 - > 
< / xsl：for> 
< / xsl：for> 
  

这并不是很好，因为有时我需要访问几条信息，为每件创建一个变量。有没有更简单的方法？

解决方案

您可以将整个/ Root / A结构存储在一个变量中，并引用变量，而不是为每个需要访问的属性和子元素创建一个新变量。

 < xsl：for-each select = /根/ A / > 
< xsl：variable name =ROOT_Aselect =。/> 
  <！ - 变量是这样访问的：$ ROOT_A / @ someAttribute 
就像普通的XML节点 - > 
< / xsl：for-each> 
< / xsl：for-each> 
  

I have nested xsl:for loops:

<xsl:for-each select="/Root/A">
    <xsl:for-each select="/Root/B">
        <!-- Code -->
    </xsl:for>
</xsl:for>

From within the inner loop, how can I access attributes from the current node in the outer loop?

I keep finding myself writing code like this:

<xsl:for-each select="/Root/A">
    <xsl:variable name="someattribute" select="@SomeAttribute"/>
    <xsl:for-each select="/Root/B">
        <!-- Now can use $someattribute to access data from 'A' -->
    </xsl:for>
</xsl:for>

This doesn't scale very well, as sometimes I need to access several pieces of information and end up creating one variable for each piece. Is there an easier way?

解决方案

You can store the entire /Root/A structure in a variable, and make reference to that variable rather than creating a new variable for every attribute and subelement you need to access.

<xsl:for-each select="/Root/A/">
    <xsl:variable name="ROOT_A" select="."/>
    <xsl:for-each select="/Root/B/">
         <!-- Variable is accessed like this: $ROOT_A/@someAttribute
              Just like a normal XML node -->
    </xsl:for-each>
</xsl:for-each>

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