Facets

Overview

The Facet module allows site builders to easily create and manage faceted search interfaces. In addition to the UI components that come out of the box, themers and module developers can build their own widgets that can optionally be contributed back to Drupal.org.

Facets is a Drupal 9 and above only solution. Please see Facet API for a Drupal 7 solution.

Facets 2 vs Facets 3

Facets 3.x is a partial rewrite of facets that introduces "Facets exposed filters" next to "facet blocks". There is no upgrade path currently.
There are no plans to stop maintaining the 2.x

Facets 3 will not support AJAX when using Facet blocks.
It does however support AJAX when using "facets views exposed filters", see #3396816: Facets 3.x - Exposed filters roadmap

Facets 2 work with Drupal Core Search and Search API. Facets 3 only supports Search API and builds upon the excellent Better exposed filters module.

How to Contribute

Want to create your own extension module? Post a link to your project against the appropriate issue to eliminate duplication of effort, and make sure to search for other modules that are already integrating with facets. We have a section in the README.txt for extension modules.

Attribution

The architecture of this module is a complete rewrite of the drupal 7 Facet API module with concepts inspired by search api (such as the processors).
The Drupal 8+ version were inspired by the functionality of Facet API (Drupal 7) and the facetapi_bonus (Drupal 7) project.