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From david_n_bert...@us.ibm.com
Subject Re: How to check for a null RTF?
Date Fri, 16 May 2003 20:43:12 GMT

There's really no such thing as "null" in XSLT.  Do you mean you want to
know if it's empty?  If so, you can check the string value:

   not(string($DefaultFilter)) or $DefaultFilter=$NCID_Active_Meds_In


                                               To:      xalan-j-users@xml.apache.org     
                      05/16/2003 01:14         cc:      (bcc: David N Bertoni/Cambridge/IBM)
                      PM                       Subject: How to check for a null RTF?     

I'm having a problem with some old xalan-1 code. A value is conditionally
assigned to the DefaultFilter parameter. $OSHProfile/filter/default does
not exist in the stylesheet parameter $OSHProfile. The not($DefaultFilter)
test always evaluates to false. This is because an RTF is never really
null, as I understand it.

It isn't clear to me how to rewrite this logic so it will work in xalan
2.5.0. I thought about using a boolean; but I have to be able to test
$OSHProfile/filter/default for a null value to assign the boolean variable.

Is there a way to reliably test an RTF for null?
Is there some other workaround that I am not seeing?


          <xsl:call-template name="SummaryTitles">
            <xsl:with-param name="Category">Medications</xsl:with-param>
            <xsl:with-param name="Title">Meds</xsl:with-param>
            <xsl:with-param name="Reply">medications.xsl</xsl:with-param>
            <xsl:with-param name="Icon">meds.gif</xsl:with-param>
            <xsl:with-param name="DefaultFilter">
                <xsl:when test="$EncSummary='YES'"><xsl:value-of select
                  <xsl:value-of select="$OSHProfile/filter/default"/>


                  <input type="radio" name="Sumpat" value="
{$NCID_Active_Meds_In}" onClick="javascript:SumFilterOption()">
                  <xsl:if test="not($DefaultFilter) or $DefaultFilter
                        <xsl:attribute name="checked">true</xsl:attribute>

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