How can I collapsible the facet search block with checkbox I need to create a  collapsible facet search block with check-box. Has anyone done this type of functionality. 
I tried the Facet API Collapsible module but this modules provides the link and not the check-box.
I did work on similar functionality, where the client wanted a set of check boxes inside the collapsible Facet Block. 
I found a module Collapsiblock which allows us to have check boxes inside the Facet Block.
This module will most probably help you.