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Inside of a Wordpress category metabox or any custom taxonomy box for that matter there is a link with the text "+ Add New Category" is there a way this link can be removed preferably without resorting to JS or CSS hacks to hide it? A way to hide it using some kind of filter or action hook would be best.

If no action hook or filter method exists to remove it, I would be open to JS and CSS solutions as a last resort.

The reason I am doing this is because I have a Wordpress installation integrated with Magento and I am creating and populating a custom taxonomy called "brands" with a list of brands from the Magento database so a post can be assigned to a brand. Obviously this means I don't want users to be able to add in their own terms and only be able to choose the brands added in dynamically to keep it in-sync with Magento.

Thank you.

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up vote 8 down vote accepted

The default metaboxes are registred in the file wp-admin/includes/meta-boxes.php. There you can find the function post_categories_meta_box() which will generate the taxonomy metabox. Currently there is no hook available to filter the output. But you can do one of the following:

  1. Use remove_meta_box() to remove the existing category metabox and register your own with add_meta_box(). Copy&Past the existing code to your new metabox function and remove the code block from line 345 to 367.
  2. The cleaner way: Remove the edit_terms capability from your user roles with remove_cap(). If you look in the metabox function, on line 345 you can see an if-statement which checks if the user has the capability edit_terms. If so, the + Add New XY will be displayed. Problem here, the name of the capability is dynamic and could be anything. If someone registers a taxonomy with a different capability naming, this will probably not work (untested).
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Ah, yes. Capabilities is a nice way actually. However I don't want to remove the ability from other taxonomies just one in particular. I decided hiding the link with some good old fashioned CSS was the easiest choice. Thanks for the great suggestions. –  DigitalSea Sep 22 '11 at 23:13
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I can't comment on rofflox's post, but the capability looks to have been changed to "manage_categories" –  pkmatte Apr 9 at 18:47
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