Select2 dropdown but allow new values by user?

Question

I want to have a dropdown with a set of values but also allow the user to \"select\" a new value not listed there.

I see that select2 supports this if you are using

Answer 1

Since many of these answers don't work in 4.0+, if you are using ajax, you could have the server add the new value as an option. So it would work like this:

1. User searches for value (which makes ajax request to server)
2. If value found great, return the option. If not just have the server append that option like this: [{"text":" my NEW option)","id":"0"}]
3. When the form is submitted just check to see if that option is in the db and if not create it before saving.