At 06:13 10/05/2002, [EMAIL PROTECTED] wrote: >'else' is tricky within the block oriented structure of anything XML-ish, >because of the concept of 'well-formedness'. The 'if' statement would have >to be singly wrapped, and the else block wrapped separately, looking at >least somewhat awkward any way you go about it. The best I can come up with >in my mind is this, in order to have the 'else' pick up on the condition >expressed in its surrounding container. But, yuck: > ><if ...> > true stuff > <else> > false stuff > </else> ></if> > > >A good page template way is something like this: > ><tal:if condition="myTalesExpression"> > truth ></tal:if> ><tal:else condition="not:myTalesExpression"> > false ></tal:else> > >The 'not' TALES namespace is valuable. The downside is that you evaluate >the expression twice. A good way to work within this is something that I >did earlier today, outside of this conversation, where I evaluate an >expression earlier and assign it to a variable: > ><div id="edit-area" > tal:define="editItems python:here.getMenuItem(...)"> > > <h3>Edit Menu Items</h3> > <form action="Delete" method="post" name="actForm" > tal:condition="editItems"> > > ... (form and table elements, and a loop over editItems > contained in here if there were results) ... > > </form> > > <div class="emph" > tal:condition="not:editItems"> > No menu items available > </div> > ></div> > > >This is something I did a lot in DTML too, setting a search result to either >a global variable, or inside of a large <dtml-let> namescape
It is maybe not clear that the above is really usable and allowed. I do not know how and where to stress that the tal: marked tags are underdocumented what a pity. I have already tried : http://www.zope.org/Documentation/ZopeBook/AdvZPT.stx#3-44 Sorry that I am not able to explain it better... -- Godefroid Chapelle BubbleNet sprl rue Victor Horta, 18 / 202 1348 Louvain-la-Neuve Belgium Tel + 32 (10) 459901 Mob + 32 (477) 363942 TVA 467 093 008 RC Niv 49849 _______________________________________________ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )