Facets are not correctly populated when using AJAX if you have an exposed fulltext filter and also expose the list of searched fields.
Create a search api based view.
Add an exposed fulltext search filter.
Also expose the list of searched fields.
Navigate to the view. The exposed form will contain a <input> for the search itself and a multi-value <select> for the choice of fields to search.
Choose two or more fields to search from.
Upon submitting the form, the URL will look something like this: /myview?search_api_fulltext=foo&search_api_fulltext_searched_fields[]=field1&search_api_fulltext_searched_fields[]=field2
Note the two query parameters called search_api_fulltext_searched_fields[]
Form API can handle this, and the parsed query parameters contain ['search_api_fulltext' => 'foo', search_api_fulltext_searched_fields' = ['field1', 'field2']].
Enable AJAX.
in `facets.views.ajax.js`, we come across a call to Drupal.Views.parseQueryString(href). That does not respect multiple values for a single query parameter.
Instead it returns an object that looks like this: {"search_api_fulltext": "foo", "search_api_fulltext_searched_fields": "field1"}. The second field name (arbitrary) is missing.
https://www.drupal.org/project/drupal/issues/2175513 🐛 Handle params array in Drupal.Views.parseQueryString JS function Closed: won't fix isn't getting fixed and suggests contrib do this:
Use URLSearchParams instead of Drupal.Views.parseQueryString(href).
Make patch available.
Given that this is an old version of facets 2, this is more for reference than anything else.
Active
2.0
Code
Same problem, I have tried the patch and it seems to resolve it
set to RTBC