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  • XSLT: Selecting elements by length of content text?

    Here's an interesting situation. I'm working on an XML language for geometry, but I have a small problem in rendering a symbolism for arcs, rays and lines. For line segments, it's pretty simple: I associate a CSS styling with the element in question:

    Code:
    geo:line[ends="both"] {
       text-decoration: overline
       }
    But beyond that, I need a little help...

    For instance, with an arc:

    Code:
    <geo:arc id="ABC">...</geo:arc>
    the presentation would need to be in the format:

    Code:
    <svg:g transform="translate(10,20)">
    <svg:path d="M 0 10 A 20 10 0 0 1 26 10" fill="none" stroke="#000000" />
    <svg:text x="0" y="20" font-family="Times New Roman">ABC</svg:text>
    </svg:g>
    With a two-letter id attribute for geo:arc, I'd need:

    Code:
    <svg:g transform="translate(10,0)">
    <svg:path d="M 0 10 A 20 20 0 0 1 18 10" fill="none" stroke="#000000" />
    <svg:text x="0" y="20" font-family="Times New Roman">AB</svg:text>
    </svg:g>
    A little different, obviously. So I'm wondering how to construct the <xsl:template>...</xsl:template> match attribute to distinguish between a two-character text content and a three-character text content.

    Advice?
    "The first step to confirming there is a bug in someone else's work is confirming there are no bugs in your own."
    June 30, 2001
    author, ES-Membrane project (Github Pages site)
    author, Verbosio prototype XML Editor
    author, JavaScript Developer's Dictionary
    https://alexvincent.us/blog

  • #2
    Say you want to check the length of the @id node of the context node:

    string-length(string(@id))

    Will return that number, so you can attach that as a predicate with a =2 to select only nodes with @id value equal to 2.

    A quick example document and XSL document:

    Code:
    <?xml version="1.0" encoding="UTF-8"?>
    <?xml-stylesheet type="text/xsl" href="test.xsl"?>
    
    <docEl>
    	<test id="aa">Element with id = "aa"</test>
    	<test id="aaa">Element with id = "aaa"</test>
    	<test id="ab">Element with id = "ab"</test>
    	<test id="ac">Element with id = "ac"</test>
    	<test id="abb">Element with id = "abb"</test>
    </docEl>
    And the XSLT document:
    Code:
    <?xml version="1.0" encoding="UTF-8"?>
    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    	<xsl:output method="html"/>
    	<xsl:template match="/">
    		<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
    			<head>
    				<title>Test</title>
    			</head>
    			<body>
    				All elements with id lengths = 2:
    				<xsl:apply-templates select="docEl/test[string-length(string(@id)) = 2]"/>
    			</body>
    		</html>
    	</xsl:template>
    
    	<xsl:template match="test">
    		<div>
    			<xsl:value-of select="."/>
    		</div>
    	</xsl:template>
    </xsl:stylesheet>
    Works beautifully in Mozilla 1.0 and IE6.
    Last edited by jkd; Jun 23, 2002, 10:26 PM.
    jasonkarldavis.com

    Comment


    • #3
      Thanks, Jason. Now if you'd only turn off your smileys...
      "The first step to confirming there is a bug in someone else's work is confirming there are no bugs in your own."
      June 30, 2001
      author, ES-Membrane project (Github Pages site)
      author, Verbosio prototype XML Editor
      author, JavaScript Developer's Dictionary
      https://alexvincent.us/blog

      Comment


      • #4
        Originally posted by Alex Vincent
        Thanks, Jason. Now if you'd only turn off your smileys...
        Oops, you could have turned them off yourself you know Mr. Moderator .

        Anyway, just disabled them, and proudly proclaiming post #100.
        jasonkarldavis.com

        Comment

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