RE: [xsl] How to calculate attribute values with XSL ?

["Michael Kay" <michael dot h dot kay at ntlworld dot com>]

> I'm working with working with XSL for HTML output.   A
> problem that has occured
> several times is that I want to calculate the values of HTML
> attributes based on
> input XML values, but I'm not able to find a sensible way to do it.
>
> For instance if I want to change the background colour
> (bccolor attribute) of a
> table row based on the XML tags <state> and <ack>, where
> (<state>on</state> and
> <ack>off</ack>) shall give bgcolor="#ff0000", while
> (<state>on</state> and
> <ack>on</ack>) shall give bgcolor="#008000".
>
> I can solve this by writing :
>    <xsl:if test="state = 'on' and ack = 'off'">
>       <tr bgcolor="#ff0000">table contents</tr>
>    </if>
>    <xsl:if test="state = 'on' and ack = 'on'">
>       <tr bgcolor="#008000">table contents</tr>
>    </if>
>
Use
<tr>
  <xsl:attribute name="bgcolor">
    <xsl:if test="state = 'on' and ack = 'on'">#ff0000</xsl:if>
    <xsl:if test="state = 'on' and ack = 'off'">#008000</xsl:if>
  </xsl:attribute>
  table contents
</tr>

In XSLT 2.0, you can do it all within an attribute value template if you
want:

<tr bgcolor="{if (....) then '#ff0000' else ....}">

Mike Kay


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