[xsl] Re: Returning a value from a template

[Narayan <ed_narayanan@xxxxxxxxx>]

Date: Tue, 09 Nov 2010 21:50:43 -0500
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [xsl]
Returning a value from a template
Message-Id:
<7.0.1.0.2.20101109211020.023bec20@xxxxxxxxxxxxxxxxxxxxxx>

At 2010-11-09
18:07 -0800, Narayan wrote:
>I have been scratching my head on how to return a
value from a called template
>which includes a for loop. A snippet of the XML
fragment is as follows:
>
>  <Loop-N1>
>      <Segment-N1>
>         
<Element-98>BT</Element-98>
>          <Element-93 xsi:nil="true"/>
>         
<Element-66>21</Element-66>
>          <Element-67>RA0129937</Element-67>
>   
  </Segment-N1>
>    </Loop-N1>
>    <Loop-N1>
>      <Segment-N1>
>         
<Element-98>ST</Element-98>
>          <Element-93>ABC COLUMBUS
DIVISION</Element-93>
>          <Element-66>11</Element-66>
>         
<Element-67>RA0314562</Element-67>
>      </Segment-N1>
>    </Loop-N1>
>
>The
element <Loop-N1> can occur multiple times. If one of the <Element-66>'s
>contain a value of "21" then I need to generate a fixed string value 
>else I
need
>to generate another fixed string literal. So I tried creating a named
template
>and calling this from my main template like a function:
>
>   
<xsl:template name="getOrderSource">
>
>    <xsl:for-each
select="/ns0:Transaction-850/ns0:Loop-N1">
>        <xsl:if
test='ns0:Segment-N1/ns0:Element-66 = "21"'>
>          <xsl:variable
name="ordrSrc" select="NAEDI"/>
>        </xsl:if>
>    </xsl:for-each>
>
>   
<xsl:choose>
>      <xsl:when test='$orderSrc = "NAEDI"'>
>        <xsl:text
disable-output-escaping="no">NAEDI</xsl:text>
>      </xsl:when>
>     
<xsl:otherwise>
>        <xsl:text
disable-output-escaping="no">NAEDIBrokerage</xsl:text>

(the default for d-o-e
is "no" so you don't have to say it)

>      </xsl:otherwise>
>   
</xsl:choose>
>  </xsl:template>
>
>This was called like:
>  <corecom:ID>
>   
        <xsl:call-template name="getOrderSource"/>
>  </corecom:ID>
>
>
>However, I realized that the variable declared inside the for-each is not
>visible to the xsl:choose that follows.

Right.  The scope of a local
variable is the following siblings and 
their descendants.  There are no such
following siblings.

>What I was trying to do is to set a flag
>to indicate
that the element exists and then return the appropriate string
>literal. Would
there be a simpler way to do this?

Yes ... don't use the flag.  Something
along the lines of:

  <xsl:template name="getOrderSource">
    <xsl:for-each
select="/ns0:Transaction-850/ns0:Loop-N1">
      <xsl:choose>
       
<xsl:when test='ns0:Segment-N1/ns0:Element-66 = "21"'>NAEDI</xsl:when>
       
<xsl:otherwise>NAEDIBrokerage</xsl:otherwise>
      </xsl:choose>
   
</xsl:for-each>
  </xsl:template>

I hope this helps.

. . . . . . . Ken

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------------------------------

Thanks
Ken. The problem with the above approach is that if there are 3 Loop-N1's
then the output would be:
<corecom:ID>NAEDIBrokerageNAEDIBrokerageNAEDIBrokerage</corecom:ID>

Thats why
I was trying to set a flag inside the loop and then return a Single 
value.