My client wants an input element for a custom form to behave like this:
- Dropdown checkbox multiple
- Autosuggest field
So if we have a list of countries (Spain, UK, USA), it can display all the elements, and allows to select several of them. And if it is a long list of countries, you could search by entering the few letters, and only those items which match the entered letters would appear.
As for the first behaviour, I have found the following module "Dropdwon checkboxes". As for the second one, I haven't found any module so far, but in the wild there is this example (see example: Filtering mode: (filter existing list) ).