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Grouping in XSLT
2008-12-16 15:34:15 by Martynas Jusevičius
Together with joining, grouping is one of the most used techniques in XSLT, at least in my practice. Unfortunately, there is no native support in XSLT 1.0 (there is <xsl:for-each-group> construct in XSLT 2.0).
However, grouping can be implemented in XSLT 1.0 as well using the Muenchian method. For that you will need a key to compute values by which elements will be grouped, and (as I do it) one template to handle the whole group of elements, and one template to handle each element, single entry in the group.
Suppose we have a list of keywords used in a book, containing the text itself and the number of the page it appears on:
<keywords>
<keyword>
<text>XML</text>
<page>25</page>
</keyword>
<keyword>
<text>PHP</text>
<page>10</page>
</keyword>
<keyword>
<text>XSLT</text>
<page>30</page>
</keyword>
<keyword>
<text>W3C</text>
<page>2</page>
</keyword>
</keywords>Now, as it is common in publishing, we want to use them to build an aplhabetically-grouped index of keywords to be added to the appendix of the book.
First we define a key, which assigns each keyword a value equal to the first letter of its text (and can be used to select keywords starting with the same letter):
<xsl:key name="keywords-by-letter" match="keyword" use="substring(text, 1, 1)"/>
Then, a group template which displays the current letter and a list of keywords starting with it:
<xsl:template match="keyword" mode="group">
<xsl:variable name="letter" select="substring(text, 1, 1)"/>
<h1>
<xsl:value-of select="$letter"/>
</h1>
<ul>
<xsl:apply-templates select="key('keywords-by-letter', $letter)" mode="entry"/>
</ul>
</xsl:template>And a template to show a single keyword as a list item (notice how mode is different from the group template):
<xsl:template match="keyword" mode="entry">
<li>
<xsl:value-of select="text"/>, page <xsl:value-of select="page"/>
</li>
</xsl:template>Finally, we can put this all to use with a master template which applies templates for each keyword group, or in other words, for each unique starting letter found in the keyword list:
<xsl:template match="keywords">
<html>
<head>...</head>
<body>
<xsl:apply-templates select="keyword[generate-id(.) = generate-id(key('keywords-by-letter', substring(text, 1, 1))[1])]" mode="group">
<xsl:sort select="text"/>
</xsl:apply-templates>
</body>
</html>
</xsl:template>XML and XSLT will be both grouped under X.
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del.icio.us!Comments (101)
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Grouping in XSLT
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HTML is not easier to parse than XHTML, supported basically on the same level, has no extension mechanism (like namespaces), and is arguably less logical to write (when is there a closing tag, and when not?). So why the nonsense?
2010-01-25 12:15:01 by mcitp certification
HTML is not easier to parse than XHTML, supported basically on the same level, has no extension mechanism (like namespaces), and is arguably less logical to write (when is there a closing tag, and when not?). So why the nonsense?
2010-01-25 12:18:34 by mcsa test
HTML is not easier to parse than XHTML, supported basically on the same level, has no extension mechanism (like namespaces), and is arguably less logical to write (when is there a closing tag, and when not?). So why the nonsense?
mcsa test
HTML is not easier to parse than XHTML, supported basically on the same level, has no extension mechanism (like namespaces), and is arguably less logical to write (when is there a closing tag, and when not?). So why the nonsense?
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