Custom facetwp drop down

I have following scenario:

1. I need two facetwp drop downs.
2. The first drop down will have some specific pages which can be populated using page ids.
3. The second drop down will have sub pages of the page selected in the first drop down.
4. The selected value of the drop down will be the search criteria.
5. The search will be performed upon selecting value from either drop down.
6. There will be more filters for selecting the posts like post date etc.

Can anyone please guide me in implementing this type of scenario.

Thanks.

FacetWP documentation: http://ift.tt/1IgjwS5 Custom facetwp docs: http://ift.tt/1I0QgOI

via Chebli Mohamed