XSLT按属性值排序 [英] XSLT sort by attribute value

问题描述

我有一个关于如何根据属性值进行排序的问题。

我有以下源文档，我想按照标题类值。

希望有人可以帮助解决这个问题。

 < trackList> 
 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =STD> Data Two< / title> 
< / track> 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =SH>资料三< / title> 
 
< / track> 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =STD> Data Four< / title> 
 
< / track> 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =SH> Data Five< / title> 
 
< / track> 
< / trackList> 
  

最终输出应该如下所示：

 <曲目> 
 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =SH>资料三< / title> 
 
< / track> 
 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =SH> Data Five< / title> 
 
< / track> 
 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =STD> Data Four< / title> 
 
< / track> 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =STD> Data Two< / title> 
< / track> 
< / trackList> 
  

我尝试了以下方法，但无效。

 < xsl：for-each-group select =titlegroup-by =@ class> 
 
< xsl：for-each select =current-group（）> 
< xsl：value-of select =@ class/> 
< / xsl：for-each> 
 
< / xsl：for-each-group> 
  

谢谢。

解决方案你可以这样做：

 < xsl：stylesheet version =1.0xmlns：xsl = http://www.w3.org/1999/XSL/Transform > 
< xsl：output method =xmlindent =yesomit-xml-declaration =yes/> 
 
< xsl：template match =@ * | node（）> 
< xsl：copy> 
< xsl：apply-templates select =@ * | node（）/> 
< / xsl：copy> 
< / xsl：template> 
 
< xsl：template match =trackList> 
< xsl：copy> 
< xsl：apply-templates select =track> 
< xsl：sort select =title / @ class/> 
< / xsl：apply-templates> 
< / xsl：copy> 
< / xsl：template> 
 
< / xsl：stylesheet> 
  

运行您的示例输入时，结果为：

 < trackList> 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =SH>资料三< / title> 
 
< / track> 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =SH> Data Five< / title> 
 
< / track> 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =STD> Data Two< / title> 
< / track> 
<曲目> 
< location> http：// localhost / vmydoc< / location> 
< title class =STD> Data Four< / title> 
 
< / track> 
< / trackList> 
  

I have a question about how to sort based on attribute value.

I have the following source document and I would like to sort the track items by the value of the title class value.

Hopefully someone can help with this.

 <trackList>

    <track>
        <location>http://localhost/vmydoc</location>
        <title class="STD">Data Two</title>
        </track>
    <track>
        <location>http://localhost/vmydoc</location>
        <title class="SH">Data Three</title>

    </track>
    <track>
        <location>http://localhost/vmydoc</location>
        <title class="STD">Data Four</title>

    </track>
    <track>
        <location>http://localhost/vmydoc</location>
        <title class="SH">Data Five</title>

    </track>
</trackList>

The final output should look like this:

<trackList>

    <track>
        <location>http://localhost/vmydoc</location>
        <title class="SH">Data Three</title>

    </track>

    <track>
        <location>http://localhost/vmydoc</location>
        <title class="SH">Data Five</title>

    </track>

    <track>
        <location>http://localhost/vmydoc</location>
        <title class="STD">Data Four</title>

    </track>
    <track>
        <location>http://localhost/vmydoc</location>
        <title class="STD">Data Two</title>
    </track> 
</trackList>

I have tried the following but it does not work.

<xsl:for-each-group select="title" group-by="@class">

    <xsl:for-each select="current-group()">
        <xsl:value-of select="@class" />
    </xsl:for-each>

</xsl:for-each-group>

Thanks.

解决方案

You can do this as follows:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" indent="yes" omit-xml-declaration="yes"/>

  <xsl:template match="@* | node()">
    <xsl:copy>
      <xsl:apply-templates select="@* | node()"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="trackList">
    <xsl:copy>
      <xsl:apply-templates select="track">
        <xsl:sort select="title/@class"/>
      </xsl:apply-templates>
    </xsl:copy>
  </xsl:template>

</xsl:stylesheet>

When run on your sample input, the result is:

<trackList>
  <track>
    <location>http://localhost/vmydoc</location>
    <title class="SH">Data Three</title>

  </track>
  <track>
    <location>http://localhost/vmydoc</location>
    <title class="SH">Data Five</title>

  </track>
  <track>
    <location>http://localhost/vmydoc</location>
    <title class="STD">Data Two</title>
  </track>
  <track>
    <location>http://localhost/vmydoc</location>
    <title class="STD">Data Four</title>

  </track>
</trackList>

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