XSLT - 使用嵌套的for-each循环的内部循环访问外部元素

Question

我刚接触XSLT，有一个问题需要我在内部for-each的外部循环中访问元素的值。我的XML如下所示：

<searchresults>
    <journeygroup>
        <journeygroupnum>1</journeygroupnum>
        <journeydetails>
            <flightsegments>1</flightsegments>
            <journeyid>1</journeyid>
            <currency>USD</currency>
            <fare>399.00</fare>
            <taxes>99.00</taxes>
            <flights>
                <segmentid>1</segmentid>
                <legid>1</legid>
                <marketingcarrier>DL</marketingcarrier>
                <operatingcarrier>DL</operatingcarrier>
                <flightnum>9695</flightnum> 
            </flights>
        </journeydetails>
        <journeydetails>
            <flightsegments>1</flightsegments>
            <journeyid>2</journeyid>
            <currency>USD</currency>
            <fare>459.00</fare>
            <taxes>129.00</taxes>
            <flights>
                <segmentid>1</segmentid>
                <legid>1</legid>
                <marketingcarrier>AA</marketingcarrier>
                <operatingcarrier>AA</operatingcarrier>
                <flightnum>5070</flightnum> 
            </flights>
        </journeydetails>
    </journeygroup>
</searchresults>

我的XSLT文档的一部分如下所示：

<table>
<xsl:for-each select="searchresults/journeygroup/journeydetails">       
    <xsl:for-each select="flights[segmentid='1']">
    <tr>
        <td><xsl:value-of select="marketingcarrier"/></td>
        <td><xsl:value-of select="operatingcarrier"/></td>
        <td><xsl:value-of select="flightnum"/></td>

        <!-- Here I would like to add columns with the currency and fare from the outer loop -->
        <td>currency</td>
        <td>fare</td>
    </tr>
    </xsl:for-each>
</xsl:for-each>
<table>

如何在内部 for-each 循环中访问外部循环中的 currency 和 fare 节点中的值。

- iowa

---

请参见https://dev59.com/CXRB5IYBdhLWcg3w9b59。 - Vadzim

Answer 1

您可以相对地访问父级：

<xsl:value-of select="../currency"/>

或者用一个变量捕获外层循环的当前节点，然后在内部访问它：

<table>
  <xsl:for-each select="searchresults/journeygroup/journeydetails">
    <xsl:variable name="journeyDetails" select="."/>
    <xsl:for-each select="flights[segmentid='1']">
      <tr>
        <td><xsl:value-of select="marketingcarrier"/></td>
        <td><xsl:value-of select="operatingcarrier"/></td>
        <td><xsl:value-of select="flightnum"/></td>

        <!-- Here I would like to add columns with the 
             currency and fare from the outer loop -->
        <td><xsl:value-of select="$journeyDetails/currency"/></td>
        <td><xsl:value-of select="$journeyDetails/fare"/></td>
      </tr>
    </xsl:for-each>
  </xsl:for-each>
</table>

- kjhughes

---

谢谢，两个建议都有效。这两个选项中有一个更好吗？ - iowa

相对路径在这种简单情况下更加简洁和合适。当命名良好且上下文在更复杂的情况下不太清晰时，定义一个单独的变量可能更容易理解。 - kjhughes

Answer 2

使用父级轴，也称为 .. 操作符。

<table>
<xsl:for-each select="searchresults/journeygroup/journeydetails">       
<xsl:for-each select="flights[segmentid='1']">
<tr>
    <td><xsl:value-of select="marketingcarrier"/></td>
    <td><xsl:value-of select="operatingcarrier"/></td>
    <td><xsl:value-of select="flightnum"/></td>

    <!-- Here I would like to add columns with the currency and fare from the outer loop -->
    <td><xsl:value-of select="../currency"/></td>
    <td><xsl:value-of select="../fare"/></td>
</tr>
</xsl:for-each>
</xsl:for-each>
<table>

- Agnes

Answer 3

使用<xsl:value-of select="../currency"/>向上导航。

- Martin Honnen