Re: Defining an attribute only if not empty

[Wendell Piez <wapiez at mulberrytech dot com>]

Carlos,

This is pretty straightforward:

<xsl:element name="h1">
  <xsl:if test="fm/@id">
    <xsl:attribute name="id">
      <xsl:value-of select="fm/@id"/>
    </xsl:attribute>
  </xsl:if>
  <xsl:if test="fm/@class">
    <xsl:attribute name="class">
      <xsl:value-of select="fm/@class"/>
    </xsl:attribute>
  </xsl:if>
</xsl:element>

Note that in order to perform the test, the processor changes the
expression (e.g. 'fm/@class') that returns a node-set, into a Boolean, and
it turns true if the set is not empty (i.e. if there is such an attribute).
If you want to make sure the attribute exists and is not the empty string, use

<xsl:if test="string(fm/@class)">
  <xsl:attribute name="class">
    <xsl:value-of select="fm/@class"/>
  </xsl:attribute>
</xsl:if>

Enjoy,
Wendell

At 12:50 PM 5/8/00 -0700, you wrote:
>I'm trying to add an attribute to an element, something like this:
>
><xsl:element name="h1">
>	<xsl:attribute name="id"><xsl:value-of select="fm/@id"/></xsl:attribute>
>	<xsl:attribute name="class"<xsl:value-ofselect="fm/@class"
>		/></xsl:attribute>
></xsl:element>
>
>Now my question is, how can I detect whether an attribute doesnt' have a
>value (like, say, @id is empty)?


======================================================================
Wendell Piez                            mailto:wapiez@mulberrytech.com
Mulberry Technologies, Inc.                http://www.mulberrytech.com
17 West Jefferson Street                    Direct Phone: 301/315-9635
Suite 207                                          Phone: 301/315-9631
Rockville, MD  20850                                 Fax: 301/315-8285
----------------------------------------------------------------------
  Mulberry Technologies: A Consultancy Specializing in SGML and XML
======================================================================


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list