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I have a custom taxonomy, "position", with multiple terms for a custom post type, "employee" in the admin. I want to validate the form to require a position to be selected when you save/update a post.

How do I validate and make the position custom taxonomy a required field in the wordpress admin?

Also, I'd like to display an error message to indicate to users that a position is required to be checked.

Thanks!

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3 Answers

I've posted an answer to very similar question here which provides a "framework" to validate post fields (title,content...) meta fields (any metabox) and taxonomies (category, tags, custom) by ajax before submiting the post.

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following this tutorial i replaced the standard taxonomy metabox with a custom metabox that has a set of radio buttons. (the tutorial uses a select, but it isn't that different). this way you can ensure that something is selected AND limit the selections to a few pre-defined options.

http://shibashake.com/wordpress-theme/wordpress-custom-taxonomy-input-panels

there is a note about how to remove the default metabox, but you can prevent the UI from ever displaying by declaring show-ui to false when you define your taxonomy.

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I'd say, hook into pre_post_update and check what is given via $_POST...

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