The xsl:attribute-set Element: Generating Attribute Sets

The <xsl:attribute-set> Element: Generating Attribute Sets

Sometimes when you create a new element, you want to add a number of attributes to that element all at once. Theres an easy way to do that, because you can use the <xsl:attribute-set> element. This element has two attributes:

  • name (mandatory). The name of the attribute set. Set to a QName.

  • use-attribute-sets (optional). The names of other attribute sets you want included in this one. Set to a whitespace-separated list of QNames.

The <xsl:attribute-set> element encloses <xsl:attribute> elements, one for each new attribute you want to create. When you use <xsl:attribute-set> to create a new set of attributes for an element, you give the attribute set a name. You can then assign that name to the use-attribute-sets attribute of the <xsl:copy> , <xsl:element> , <xsl:for-each> elementsand of even the <xsl:attribute-set> element itselfto use that attribute set when you create the new element.

You already saw one example that used attribute sets in the JavaScript-creating template earlier in this chapter. In that example, I used an attribute set to specify all the attributes in the planets HTML buttons , then used that attribute set in an <xsl:element> element to create those buttons:

 <BODY>          <CENTER>              <H1>The Mass Page</H1>          </CENTER>          <xsl:for-each select="PLANET">              <P/>              <xsl:element name="input" use--attribute-sets="attribs"/>          </xsl:for-each>          <P/>          <P/>          <DIV ID='display'></DIV>      </BODY>  </HTML>      </xsl:template>      <xsl:attribute-set name="attribs">      <xsl:attribute name="type">BUTTON</xsl:attribute>      <xsl:attribute name="value"><xsl:value-of select="NAME"/></xsl:attribute>      <xsl:attribute name="onclick"><xsl:value-of select="NAME"/>()</xsl:attribute>      </xsl:attribute-set> 

In the result document, this attribute set was added to every HTML button, like this:

 <P></P>  <input type="BUTTON" value="Mercury" onclick="Mercury()">  <P></P>  <input type="BUTTON" value="Venus" onclick="Venus()">  <P></P>  <input type="BUTTON" value="Earth" onclick="Earth()"> 

In the following example, I use an attribute set to number the planets in planets.xml. I add two attributes to each <PLANET> element: number and total . The number attribute will hold the planets number, starting from 1, and the total attribute will hold the total number of planets in planets.xml, which I can determine with the count function (which youll see in Chapter 8):

Listing 6.11 Using <xsl:attribute-set>
 <xsl:stylesheet   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"   version="1.0">  <xsl:output method="xml" indent="yes"/>  <xsl:template match="*">      <xsl:copy>          <xsl:apply-templates/>      </xsl:copy>  </xsl:template>  <xsl:template match="PLANET">      <xsl:copy use-attribute-sets="numbering">          <xsl:apply-templates/>      </xsl:copy>  </xsl:template>  <xsl:attribute-set name="numbering">      <xsl:attribute name="number"><xsl:number/></xsl:attribute>      <xsl:attribute name="total"><xsl:value-of select="count(//PLANET)"/></xsl:attribute>  </xsl:attribute-set>  </xsl:stylesheet> 

Heres the result. Note that every <PLANET> element has both a number and total attribute:

 <?xml version="1.0" encoding="UTF-8"?>  <PLANETS>      <PLANET number="1" total="3">          <NAME>Mercury</NAME>          <MASS>.0553</MASS>          <DAY>58.65</DAY>          <RADIUS>1516</RADIUS>          <DENSITY>.983</DENSITY>          <DISTANCE>43.4</DISTANCE>      </PLANET>      <PLANET number="2" total="3">          <NAME>Venus</NAME>          <MASS>.815</MASS>          <DAY>116.75</DAY>          <RADIUS>3716</RADIUS>          <DENSITY>.943</DENSITY>          <DISTANCE>66.8</DISTANCE>      </PLANET>      <PLANET number="3" total="3">          <NAME>Earth</NAME>          <MASS>1</MASS>          <DAY>1</DAY>          <RADIUS>2107</RADIUS>          <DENSITY>1</DENSITY>          <DISTANCE>128.4</DISTANCE>      </PLANET>  </PLANETS> 


Inside XSLT
Inside Xslt
ISBN: B0031W8M4K
EAN: N/A
Year: 2005
Pages: 196

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