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<div id="tabs-wrapper" class="clearfix"> <h1 class="with-tabs">Plone 3: How to really exclude from navigation</h1>
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<span class="submitted">21. August 2009 - 0:49 — <span class="username">Martin</span></span>
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<div class="content clearfix">
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<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Plone has multiple ways of excluding a content object from the navigation:</p>
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<ul>
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<li>In the edit tab of the object under settings check "Exclude from navigation"</li>
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<li>Add the ID to <span class="geshifilter"><code class="text geshifilter-text">idsNotToList</code></span> in <span class="geshifilter"><code class="text geshifilter-text">portal_properties/navtree_properties</code></span></li>
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<li>Add the meta type to <span class="geshifilter"><code class="text geshifilter-text">metaTypesNotToList</code></span> in <span class="geshifilter"><code class="text geshifilter-text">portal_properties/navtree_properties</code></span></li>
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</ul>
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<p>This works fine but the item is still displayed in the navigation tree if it's the current item (the one you're currently viewing). This may have a reason (usability?) but it is not what I want in some cases. If you put a link to the terms and conditions in the footer, for example, you don't want this to show up in the navigation tree when you click on it.</p>
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<p>To solve this you can override the template for the navigation portlet (it may also work for the portal tabs) and add the conditions for the exclusion there.</p>
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<h2>Overriding the navigation portlet template</h2>
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<p>Copy the files <span class="geshifilter"><code class="text geshifilter-text">navigation.pt</code></span> and <span class="geshifilter"><code class="text geshifilter-text">navigation_recurse.pt</code></span> to your package. Then create a file <span class="geshifilter"><code class="text geshifilter-text">navigation.py</code></span> with the following content to create your own renderer based the original overriding the templates:</p>
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<div class="geshifilter"><div class="python geshifilter-python"><span class="kw1">from</span> plone.<span class="me1">app</span>.<span class="me1">portlets</span>.<span class="me1">portlets</span>.<span class="me1">navigation</span> <span class="kw1">import</span> Renderer<br />
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<span class="kw1">from</span> Products.<span class="me1">Five</span>.<span class="me1">browser</span>.<span class="me1">pagetemplatefile</span> <span class="kw1">import</span> ViewPageTemplateFile<br />
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<br />
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<span class="kw1">class</span> MyRenderer<span class="br0">(</span>Renderer<span class="br0">)</span>:<br />
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_template <span class="sy0">=</span> ViewPageTemplateFile<span class="br0">(</span><span class="st0">'navigation.pt'</span><span class="br0">)</span><br />
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recurse <span class="sy0">=</span> ViewPageTemplateFile<span class="br0">(</span><span class="st0">'navigation_recurse.pt'</span><span class="br0">)</span></div></div>
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<p>Next, you have to register the class in the <span class="geshifilter"><code class="text geshifilter-text">configure.zcml</code></span> to override the original renderer.</p>
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<div class="geshifilter"><div class="xml geshifilter-xml"><span class="sc3"><span class="re1"><configure</span></span><br />
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<span class="sc3"> <span class="re0">xmlns:plone</span>=<span class="st0">"http://namespaces.plone.org/plone"</span><span class="re2">></span></span><br />
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<br />
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<span class="sc3"><span class="re1"><include</span> <span class="re0">package</span>=<span class="st0">"plone.app.portlets"</span> <span class="re2">/></span></span><br />
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<br />
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<span class="sc3"><span class="re1"><plone:portletRenderer</span></span><br />
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<span class="sc3"> <span class="re0">portlet</span>=<span class="st0">"plone.app.portlets.portlets.navigation.INavigationPortlet"</span></span><br />
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<span class="sc3"> <span class="re0">class</span>=<span class="st0">".navigation.MyRenderer"</span></span><br />
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<span class="sc3"> <span class="re2">/></span></span><br />
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<br />
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<span class="sc3"><span class="re1"></configure<span class="re2">></span></span></span></div></div>
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<p>(Note: If you want to do this for one theme only, put the code into your theme package and add <span class="geshifilter"><code class="text geshifilter-text">layer="..browser.interfaces.IThemeSpecific"</code></span> to the <span class="geshifilter"><code class="text geshifilter-text"><plone:portletRenderer></code></span> element.)</p>
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<p>If you restart Zope now, you are using your own class and templates but there's no difference, yet.</p>
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<h2>Adding conditions to really exclude from navigation</h2>
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<p>First we expose the <span class="geshifilter"><code class="text geshifilter-text">idsNotToList</code></span> and <span class="geshifilter"><code class="text geshifilter-text">metaTypesNotToList</code></span> properties to the templates by adding the following to <span class="geshifilter"><code class="text geshifilter-text">navigation.py</code></span>:</p>
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<div class="geshifilter"><div class="python geshifilter-python">...<br />
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<span class="kw1">from</span> plone.<span class="me1">memoize</span>.<span class="me1">instance</span> <span class="kw1">import</span> memoize<br />
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<span class="kw1">from</span> Products.<span class="me1">CMFCore</span>.<span class="me1">utils</span> <span class="kw1">import</span> getToolByName<br />
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<br />
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<span class="kw1">class</span> MyRenderer<span class="br0">(</span>Renderer<span class="br0">)</span>:<br />
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...<br />
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<span class="sy0">@</span>memoize<br />
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<span class="kw1">def</span> getMetaTypesNotToList<span class="br0">(</span><span class="kw2">self</span><span class="br0">)</span>:<br />
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context <span class="sy0">=</span> <span class="kw2">self</span>.<span class="me1">context</span><br />
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portal_properties <span class="sy0">=</span> getToolByName<span class="br0">(</span>context<span class="sy0">,</span> <span class="st0">'portal_properties'</span><span class="br0">)</span><br />
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navtree_properties <span class="sy0">=</span> <span class="kw2">getattr</span><span class="br0">(</span>portal_properties<span class="sy0">,</span> <span class="st0">'navtree_properties'</span><span class="br0">)</span><br />
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<span class="kw1">return</span> <span class="kw2">list</span><span class="br0">(</span>navtree_properties.<span class="me1">metaTypesNotToList</span><span class="br0">)</span><br />
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<br />
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<span class="sy0">@</span>memoize<br />
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<span class="kw1">def</span> getIdsNotToList<span class="br0">(</span><span class="kw2">self</span><span class="br0">)</span>:<br />
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context <span class="sy0">=</span> <span class="kw2">self</span>.<span class="me1">context</span><br />
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portal_properties <span class="sy0">=</span> getToolByName<span class="br0">(</span>context<span class="sy0">,</span> <span class="st0">'portal_properties'</span><span class="br0">)</span><br />
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navtree_properties <span class="sy0">=</span> <span class="kw2">getattr</span><span class="br0">(</span>portal_properties<span class="sy0">,</span> <span class="st0">'navtree_properties'</span><span class="br0">)</span><br />
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<span class="kw1">return</span> <span class="kw2">list</span><span class="br0">(</span>navtree_properties.<span class="me1">idsNotToList</span><span class="br0">)</span></div></div>
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<p>Now we can finally add the conditions to the template so the item is not displayed in the navigation portlet any more. In <span class="geshifilter"><code class="text geshifilter-text">navigation_recurse.pt</code></span> change</p>
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<div class="geshifilter"><div class="text geshifilter-text">tal:condition="python:bottomLevel &lt;= 0 or level &lt;= bottomLevel"</div></div>
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<p>to</p>
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<div class="geshifilter"><div class="text geshifilter-text">tal:condition="python:(not node['item'].id in view.getIdsNotToList()) and (node['portal_type'] not in view.getMetaTypesNotToList()) and (not node['item'].exclude_from_nav) and (bottomLevel &lt;= 0 or level &lt;= bottomLevel)"</div></div>
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<p>That's it!</p>
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<p>References:</p>
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<ul>
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<li>http://plone.org/documentation/how-to/override-the-portlets-in-plone-3.0/</li>
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<li>http://plone.org/support/region/de#nabble-td1643152%7Ca1643152</li>
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</ul>
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<p>Alle Rechte liegen bei siarp.</p>
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<h2 class="title">Written by</h2>
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<div class="content">
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<ul class="menu"><li class="first leaf"><a href="../../blog/2/">Martin</a></li>
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<li class="last leaf"><a href="../../blog/3/">Tilman</a></li>
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</ul> </div>
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