[Zope] Navigation menu

[J. Cameron Cooper]

Michael Havard wrote:

> I've been looking for a navigation menu/sitemap for ZOPE. I've found a 
> few but the output is not very well formed.
>
> Essentially every tool I've found outputs something similar to this:
>
> <div class="item" style="text-indent:35">
>     <!-- this is a parent element //-->
>     Item
> </div>
> <div class="item" style="text-indent:65">
>     <!-- this is a child element //-->
>     Child Item
> </div>
>
> The problem here is that the html structure doesn't intrisicly show 
> any relationship between the two levels. The code just shows levels by 
> using text-indent or margins or in some code table cells. What I'm 
> looking for would display the sitemap/navigation in a format like this:
>
> <ul>
>     <li>Item
>          <ul>
>                <li>Child Item</li>
>          </ul>
>     </li>
> </ul>
>
> This structure has the element relationship built in by design. Does 
> anyone know of a product that does this or have a code snippet they 
> could pass my way.

Here's something that I use for generation of a navigation tree. You can 
simplify it by removing the highlighting stuff and the styling stuff 
that interfaces with TransMenus 
(http://personal.archomai.org/transMenus.php).

Some things specific to my code and probably not yours:

 - course: a previously defined value for the object the tree should 
start at. You could use 'root' or 'context' or something else.
 - equivalency test: mine is for Archetypes objects. You'll need some 
other testif you don't have UIDs.
 - children listing: mine is project-specific. You can probably use 
'objectValues' or 'contentValues'
 - groupishness: again, mine is project-specific, an attribute on 
groupish types. You could use truthfullness of the children-listing as 
above.

Also, I've previously posted several times a simpler recursive 
tree-walker that works similarly, but with less METAL magic.

ZPT::

...
            <ul id="collapsibleDemo">
              <li tal:define="highlight python: course.UID()==here.UID()">
                <span tal:attributes="class python:highlight and 
'ccCurrentElt' or None">
                  <a href="." tal:attributes="href course/absolute_url">
                    <img src="site_icon.gif" tal:replace="structure 
python:path('here/%s' % course.getIcon(1))"
                         tal:on-error="structure here/site_icon.gif"
                    /></a>&nbsp;<a href="." tal:attributes="href 
course/absolute_url" tal:content="course/Title">Element</a>
                </span>&nbsp;<img tal:replace="structure 
here/transmenus/arrow.png" tal:condition="highlight" />

                <ul tal:repeat="elt course/children">
                  <span metal:use-macro="template/macros/recursivetree" />
                </ul>
              </li>
            </ul>
...

<tal:macros tal:replace="nothing">
<metal:li metal:define-macro="recursivetree">
 <li tal:define="highlight python: elt.UID()==here.UID()">
   <span tal:attributes="class python:highlight and 'ccCurrentElt' or None">
     <a href="." tal:attributes="href elt/absolute_url">
       <img src="site_icon.gif" tal:replace="structure 
python:path('here/%s' % elt.getIcon(1))"
            tal:on-error="structure here/site_icon.gif"
       /></a>&nbsp;<a href="." tal:attributes="href elt/absolute_url" 
tal:content="elt/Title">Element</a>
   </span>&nbsp;<img tal:replace="structure here/transmenus/arrow.png" 
tal:condition="highlight" />

   <tal:groupish tal:condition="exists:elt/aq_explicit/isGroup">
     <ul class="collapsibleMenu" tal:condition="elt/children">
       <tal:block tal:repeat="elt elt/children">
         <span metal:use-macro="template/macros/recursivetree" />
       </tal:block>
     </ul>
   </tal:groupish>
 </li>
</metal:li>
</tal:macros>

-- 
"My point and period will be throughly wrought,
Or well or ill, as this day's battle's fought."