Re: [xsl] Something similar to managing behavior with a variable

Subject: Re: [xsl] Something similar to managing behavior with a variable
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Tue, 05 Apr 2005 13:54:24 -0400
Luke,

The easiest way to fix this, if it's possible, is to construct your condition such that it occurs in the 'select' expression that chooses the nodes to process, rather than selecting a larger set and then using an explicit conditional to filter them.

That is, instead of:

<xsl:for-each select="$nodes">
  <xsl:if test="$condition">
    ...
  </xsl:if>
  ...
</xsl:for-each>

do

<xsl:for-each select="$nodes[$condition]">
  ...
</xsl:for-each>

Then your code relying on position() will work again.

Note, this isn't always possible -- your problem may require heavier lifting. Post again with more info (including the logic of the condition) if this doesn't work for you.

Cheers,
Wendell

At 01:57 PM 4/5/2005, you wrote:
Hello;

I'm creating a UI that writes rows of data. The background of the row needs
to changes every second row. I was doing it like this:

<tr align="left" valign="middle" class="grey1ColumnText">
<xsl:choose>
<xsl:when test='number($position) mod 2 != 0'>
<xsl:attribute name="class">grey1ColumnText</xsl:attribute>
</xsl:when>
<xsl:otherwise>
<xsl:attribute name="class">grey2ColumnText</xsl:attribute>
</xsl:otherwise>
</xsl:choose>
</tr>

My problem now is now have a condition that determines when a row is to be
written. So, in a collection of 5 items maybe only 1 and 4 get written. I
still need a way to figure out how to alternate the background for the rows
that actually get written. Position no longer does the trick.

I thought I could keep the previous background in a variable like below:

<tr align="left" valign="middle" class="grey1ColumnText">
<xsl:choose>
<xsl:when test="$resultBK = 'grey1ColumnText'">
<xsl:attribute name="class">grey2ColumnText</xsl:attribute>
<xsl:variable name="resultBK" select="string('grey2ColumnText')"/>
</xsl:when>
<xsl:otherwise>
<xsl:attribute name="class">grey1ColumnText</xsl:attribute>
<xsl:variable name="resultBK" select="string('grey1ColumnText')"/>
</xsl:otherwise>
</xsl:choose>
</tr>

But I have just found out you can't change the contents of a global variable
(resultBK) after it has been defined. How can I handle this?

Thanks,

Luke

Luke Shannon | Software Developer
FutureBrand Toronto

207 Queen's Quay, Suite 400
Toronto, ON, M5J 1A7
416 642 7935 (office)


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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
17 West Jefferson Street                    Direct Phone: 301/315-9635
Suite 207                                          Phone: 301/315-9631
Rockville, MD  20850                                 Fax: 301/315-8285
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