Drupal 7 Faceted Search: Always show Facets I have a faceted search working that uses searchapi, facetapi, and entityapi. I was not the one who developed this, but I have some experience with Drupal.  As of now the navigation uses links for selection and looks like below (first level of bullet points aren't links).  When mixing is selected sound design and composition disappear as expected. 

What the client wants is for all items to still stay visible and selectable as the user drills down (even if it returns nothing). Only one item per category will be selectable at a time, but the user should be able to do it without having to 'go back'.
Any advice is greatly appreciated.


What We Do_

Mixing (18)
Sound Design(11) 
Composition (6)

Who We Are_

Joe Schmoe (17)
Jeff Bleck (14)
David Berry (4)

Affiliated Composers_

Jim Carey (3)
Tony Maroni (2)
Under admin/config/search/search_api click “edit” on your search index and select “Facets”. Then for all facets that need the described behavior for their items, follow these steps:


Click “configure display”.
In the “Global settings” section, change the “Minimum facet count” to 0 (zero). Arguably this input field should rather be called “Minimum facet item count” …
“Save configuration”.


Now all non-matching facet items should remain in your facet list (with a zero count). As you have already mentioned, clicking such a facet item will return no search results anymore.