We'll create fresh WordPress site with Single Value Taxonomy UI installed. You have 20 minutes to test the plugin after that site we'll be deleted.
This infrastructure plugin adds basic UI for single-valued taxonomies, i.e. a taxonomy with presents a select widget.
When registering your custom taxonomy, add the argument single_value set to true to get the single value UI. If a selection of this term is required, also add required set to true.
register_taxonomy(
'astrological_sign',
array( 'person' ),
array(
'hierarchical' => false,
'show_ui' => true,
'required' => true,
'single_value' => true
)
);
Development of this plugin supported by MIT Global Shakespeares.