[Zope] Reformatting <dtml-tree>

[Keith J. Farmer]

Very simple, you'd think..

How does one insert an extra (blank) row in a dtml tree, based on a
change of property value?  Alternatively, how does one alter a value
originally defined in a dtml let statement?

I'm wanting to group items in the tree, visually.

The following does NOT work (order is the property being tested, x is
used to hold the previous value):

<a HREF=3D"<dtml-var URL0>?expand_all=3D1">Expand all</a> |
<a HREF=3D"<dtml-var URL0>?collapse_all=3D1">Collapse all</a>
<br>

<dtml-let x=3D0>=20

<dtml-tree content branches_expr=3D"objectValues(['Folder','Link'])"
sort=3D"order">
 <dtml-if "meta_type=3D=3D'Folder'">

  <dtml-if expr=3D"order !=3D x"><br><dtml-call =
expr=3D"x=3Dorder"></dtml-if>

  <IMG SRC=3D"<dtml-var icon>" BORDER=3D0> <dtml-var title_or_id>
 <dtml-else>
  <b><dtml-var expr=3D"getLink(absolute_url(1))"></b>
 </dtml-if>
<dtml-if description><i class=3Dfooter><dtml-var
description></i></dtml-if>
</dtml-tree>
</dtml-let>

----------
Keith J. Farmer
kfarmer@thuban.org
http://www.thuban.org