Re: Dynamic output dependant on existance of other nod

Hi Ian,

> If Airport_choices exists, and Airport exists, then the menu is
> populated by the contents of Airport_choices and the formfield Name
> attribute is set to "Airport".
>
> If Airport_choices exists, and Airport does not exist, simply
> display a list populated by the contents of Airport Choices and the
> formfield Name attribute is set to "Airport_choices".

In a template matching the Item element, you can work out whether this
Item is an Airport_choices Item with:

  @Name = 'Airport_choices'

You can find the sibling Item elements with:

  ../Item

and you can work out whether one of them has a Name attribute equal to
'Airport' with:

  ../Item/@Name = 'Airport'

So in the template for Item elements:

  <xsl:choose>
    <xsl:when test="@Name = 'Airport_choices'">
      <xsl:variable name="fieldname">
        <xsl:choose>
          <xsl:when test="../Item/@Name = 'Airport'">Airport</xsl:when>
          <xsl:otherwise>Airport_choices</xsl:otherwise>
        </xsl:choose>
      </xsl:variable>
      <select name="{$fieldname}">
        <xsl:for-each select="Val">
          <option><xsl:value-of select="." /></option>
        </xsl:for-each>
      </select>
    </xsl:when>
    <xsl:otherwise>...</xsl:otherwise>
  </xsl:choose>

> This needs to work for combinations of any <itemname>_choice and
> <itemname> pair.

You can test whether this Item has a name in the form
<itemname>_choices with:

  substring-after(@Name, '_') = 'choices'

You can find the itemname from the name of the current Item with:

  substring-before(@Name, '_choices')

Inserting this into the above code, you get:

  <xsl:choose>
    <xsl:when test="substring-after(@Name, '_') = 'choices'">
      <xsl:variable name="itemname"
                    select="substring-before(@Name, '_choices')" />
      <xsl:variable name="fieldname">
        <xsl:choose>
          <xsl:when test="../Item/@Name = $itemname">
            <xsl:value-of select="$itemname" />
          </xsl:when>
          <xsl:otherwise>
            <xsl:value-of select="@Name" />
          </xsl:otherwise>
        </xsl:choose>
      </xsl:variable>
      <select name="{$fieldname}">
        <xsl:for-each select="Val">
          <option><xsl:value-of select="." /></option>
        </xsl:for-each>
      </select>
    </xsl:when>
    <xsl:otherwise>...</xsl:otherwise>
  </xsl:choose>


I hope that helps,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/


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