Full project of http://drupal.org/sandbox/katbailey/1229060 with some extra features.

Provides a facetapi widget plugin for collapsible facets links - see screenshot. The facets can be configured to either stay open even when another facet has been expanded, or to collapse when another facet is expanded.


Enable the module as usual, then find settings under View Index / Realm settings >> Configure Display (on a facet) >> Select "Collapsible Links" under Display Widget:
Screenshot of Configure Display screen

collapsible facets

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