Node searching in an xsl:if test

[dolot]

Here's a snippet of the xml in question:

<FACILITY_RELATED>
  <PES_ID>384</PES_ID> 
  <ES_ID>402</ES_ID> 
  <RELATED_CODE>H</RELATED_CODE> 
  <AUTO_RELATED>false</AUTO_RELATED> 
  <PESRelatedFacilityNumber>1039</PESRelatedFacilityNumber> 
  <PESRelatedFacilityTypeCode>IHB</PESRelatedFacilityTypeCode> 
  <ESRelatedFacilityNumber>1010</ESRelatedFacilityNumber> 
  <ESRelatedFacilityTypeCode>AGM</ESRelatedFacilityTypeCode> 
</FACILITY_RELATED>
<FACILITY_RELATED>
  <PES_ID>384</PES_ID> 
  <ES_ID>401</ES_ID> 
  <RELATED_CODE>Q</RELATED_CODE> 
  <AUTO_RELATED>false</AUTO_RELATED> 
  <PESRelatedFacilityNumber>1038</PESRelatedFacilityNumber> 
  <PESRelatedFacilityTypeCode>IHB</PESRelatedFacilityTypeCode> 
  <ESRelatedFacilityNumber>1010</ESRelatedFacilityNumber> 
  <ESRelatedFacilityTypeCode>AGM</ESRelatedFacilityTypeCode> 
</FACILITY_RELATED>

All these FACILITY_RELATED nodes are records from a dataset. What I need to do is determine if a given pes_id is present, and if so, then do something. I don't have to aquire the node or even know how many nodes are present - just know if it's there.

But how do I do this in an xsl:if? I basically want to be able to say <xsl:if test="if there's a pes_id = 5 somewhere in the facility_related nodes, then do something" />

I thought I would have the test in an xml:template - something like:

    <xsl:template name ='IsIDPresent'><xsl:param name='ID' />
        <xsl:for-each select ='//FACILITY_RELATED'>
            <xsl:if test ='PES_ID = $ID'>
                <xsl:value-of select ='PES_ID'/>
            </xsl:if>
        </xsl:for-each>
    </xsl:template>

But I couldn't figure out how to put the call to the template into the xsl:if test.

Are there other ways to do what I'm trying to do? Any help would be appreciated.

[MarkT]

There is no need to loop through the nodes if all you are checking is the value exists somewhere in the document. Something like this should work.

  <xsl:template match="/">
    <xsl:call-template name='IsIDPresent'>
      <xsl:with-param name='ID'>384</xsl:with-param>
    </xsl:call-template> 
  </xsl:template>


  <xsl:template name ='IsIDPresent'>
    <xsl:param name='ID' />
    <xsl:if test ='//FACILITY_RELATED/PES_ID = $ID'>
      <xsl:value-of select ='$ID'/> - present
    </xsl:if>
  </xsl:template>

[dolot]

Thanks again. I can't find any references online to any kind of complex xsl. Everything tutorial I find is so simplistic.

[dolot]

One other question: How would I evaluate the call to the template in an xsl:if statement? In other words, how would I say "if <xsl:call-template name='IsIDPresent'>, then (execute some more xsl)"

[MarkT]

Change your template to use choose instead of an if. You can use multiple when tests inside a choose and the otherwise would be the else part of an if/else if/else statement

  <xsl:template name ='IsIDPresent'>
    <xsl:param name='ID' />
    <xsl:choose>
      <xsl:when test ='//FACILITY_RELATED/PES_ID = $ID'>
        <xsl:value-of select ='$ID'/> - present
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select ='$ID'/> - not present
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

[dolot]

Maybe I'm thinking of this wrong. I'm thinking of the 'IsIDPresent' template sort of like a function that returns a boolean - or something that can be interpreted like a boolean. My plan was to call the template from another place in the code and then, based upon the value returned, either execute a block of code or skip it. But maybe I'm misunderstanding templates. (noobishness).

[MarkT]

Is this closer to your needs?

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  
  <xsl:template match="/">
    <xsl:variable name="blnPresent">
      <xsl:call-template name='IsIDPresent'>
        <xsl:with-param name='ID'>384</xsl:with-param>
      </xsl:call-template>
    </xsl:variable>

    <xsl:choose>
      <xsl:when test='$blnPresent="true"'>Value found</xsl:when>
      <xsl:otherwise>Value not found</xsl:otherwise>
    </xsl:choose>
  </xsl:template>


  <xsl:template name ='IsIDPresent'>
    <xsl:param name='ID' />
    <xsl:if test ='//FACILITY_RELATED/PES_ID = $ID'>true</xsl:if>
  </xsl:template>
  
</xsl:stylesheet>

if it is you could do the samething without a template

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  
  <xsl:template match="/">
    <xsl:variable name="blnPresent">
      <xsl:if test ='//FACILITY_RELATED/PES_ID = 385'>true</xsl:if>
    </xsl:variable>

    <xsl:choose>
      <xsl:when test='$blnPresent="true"'>Value found</xsl:when>
      <xsl:otherwise>Value not found</xsl:otherwise>
    </xsl:choose>
  </xsl:template>
</xsl:stylesheet>

[dolot]

Yes, now it's starting to make sense.

Thanks again.