RE: Dynamically controlling sort order based on values in t he XML

You can also do it in a single pass by passing the sort column to the
stylesheet as a parameter:

http://www.xslt.com/html/xsl-list/2005-03/msg01309.html

Maria
 

-----Original Message-----
From: Aron Bock [mailto:aronbock(_at_)hotmail(_dot_)com] 
Sent: Friday, June 03, 2005 10:10 AM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: RE: [xsl] Dynamically controlling sort order based on values in the
XML

I need to be able to sort the data based on the CONFIG element of the 
XML and I don't know ahead of time how many columns there are going to 
be in the dataset and how many of them I will need to sort by.


I'd approach this as a multi-pass (in this case 2-pass) transform, as
follows:

pass 1: write a stylesheet that, given your input xml, generates as its
output another stylesheet that does what you want (sorts by multiple cols,
displays multiple cols, etc).

pass 2: run this generated stylesheet against the original input

Regards,

--A

From: "Steve W" <lsl(_at_)btconnect(_dot_)com>
Reply-To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
To: <xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com>
Subject: [xsl] Dynamically controlling sort order based on values in 
the XML
Date: Fri, 3 Jun 2005 10:27:37 +0100

I have some xml that looks like :

<DISPLAY>
    <CONFIG>
        <COL>
            <ID>ColA</ID>
            <ORDERBY DIRECTION="ASC">1</ORDERBY>
        </COL>
        <COL>
            <ID>ColB</ID>
            <ORDERBY DIRECTION="DSC">2</ORDERBY>
        </COL>
    </CONFIG>
    <DATA>
        <ROW>
            <COL ID="ColA">
                <VALUE>BBB</VALUE>
            </COL>
            <COL ID="ColB">
                <VALUE>111</VALUE>
            </COL>
        </ROW>
        <ROW>
            <COL ID="ColA">
                <VALUE>CCC</VALUE>
            </COL>
            <COL ID="ColB">
                <VALUE>333</VALUE>
            </COL>
        </ROW>
        <ROW>
            <COL ID="ColA">
                <VALUE>AAA</VALUE>
            </COL>
            <COL ID="ColB">
                <VALUE>222</VALUE>
            </COL>
        </ROW>
    </DATA>
</DISPLAY>

I have a stylesheet that outputs the data sorted by the element in 
CONFIG where COL/ORDERBY/text() is 1,  which looks like :

<xsl:template match="DISPLAY">
   <xsl:variable name="sort_col"
select="CONFIG/COL[ORDERBY/text()='1']/ID/text()" />
   <xsl:apply-templates select="DATA/ROW" mode="do_data">
      <xsl:sort select="COL[(_at_)ID=$sort_col]/VALUE/text()" />
   </xsl:apply-templates>
</xsl:template>

<xsl:template match="ROW" mode="do_data">
   <xsl:value-of select="COL[(_at_)ID='ColA']/VALUE/text()" />, 
<xsl:value-of select="COL[(_at_)ID='ColB']/VALUE/text()" />
   <br />
</xsl:template>

This gives me :
AAA, 222
BBB, 111
CCC, 333

I need to be able to sort the data based on the CONFIG element of the 
XML and I don't know ahead of time how many columns there are going to 
be in the dataset and how many of them I will need to sort by.

Can anyone suggest a way to achive this ?


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