Forcing viewlets to order properly.

by Eric Steele

— filed under: for planet plone

From the Department of Putting-this-out-there-so-someone-doesn't-have-to-spend-an-hour-fighting-with-the-same-problem.

Recently, I ran into issues defining the placement of a new viewlet I'd created. The GenericSetup viewlet tag has "insert-before" and "insert-after" attributes that didn't seem to be working as I'd thought they would.

When I attempted

<order manager="plone.htmlhead" skinname="*">
  <viewlet name="glowormHtmlHeadIncludes" insert-after="plone.resourceregistries" />
</order>

my viewlet wasn't showing up where expected.

So instead, to get it to work properly, I wound up having to relist the existing viewlet I wanted it to be placed after.

<order manager="plone.htmlhead" skinname="*">
    <viewlet name="plone.resourceregistries" />
    <viewlet name="glowormHtmlHeadIncludes" />
</order>

That's it. Hope that helps.

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Re: Forcing viewlets to order properly.

Posted by David Glick at Feb 10, 2009 11:31 AM

Hmm. This exposes a limitation in GS viewlet support. The problem with the way you ended up doing it is that if there's some *other* product already installed that *also* depends on having a viewlet ordered after plone.resourceregistries, its position will get clobbered. It seems there's no good way for multiple products to affect the viewlet ordering in a deterministic fashion. :-[

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