In the following scenario, I need to ensure that any single selection cannot be chosen twice:
- Group with cloning and sorting
- The clonable group member has a dropdown...
- Can be an Advanced Select with manually listed options
- Can be a simple Select with manually listed options
- Can be a Post selector with any type of control (where CPT names replace the manually listed options that would be OK with either of the above options)
- Once the dropdown is populated with an option, another group member is added to the group (if the user needs another), and it also has the same selection UI with the same series of options, with one exception...
- ...Once any one dropdown is populated with an option, later added group members (with the aforementioned selection control) allow the user to select anything in the list except for the selections already made in other group members
Is there a way to achieve this behavior with Metabox.io?