I have a post type called fi. For that I have a custom taxonomy called fi_types. fi_types contains 5 terms.

How do I require a user to specify at least one term within this taxonomy? Preferably the Other term.

Thanks for any help.

  • Do you simply want to add the Other term to the post if the user hasn't added any terms? Would that solution work for you? Commented Dec 18, 2016 at 15:35
  • @LinneaHuxford Yes that will work perfectly. Commented Dec 19, 2016 at 7:36

1 Answer 1


I'm working on something similar at the moment. I've decided on using radio buttons or a dropdown to ensure a user has to pick from my taxonomy terms when creating their post.

I'm still refinig my solution, but these two articles have helped me a lot:


I want my metabox to appear in multiple post types so I've used this too:


Hope this helps. I will endeavour to update if I change the example code in the articles significantly.

  • Seems like it'd be a lot easier to just use Advanced Custom Fields for this. I'm already using ACF for the site. In it I could simply add a taxonomy field and make it required. However I would have to hide the normal box (in order to prevent the user from specifying the same thing twice) and that's not ideal. I wanna use the default meta box for the terms. Commented Dec 14, 2016 at 15:59

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