Custom Taxonomy as checkbox or dropdown

I have registered a custom tax to my CPT. On the edit screen the tax meta box appears with an autocomplete field.

Is it possible to display it as checkboxes or dropdown instead?

Answers:

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Method 1

You probably did not set the ‘hierarchical’ argument to true in your register_taxonomy. This would mean that it defaults to false, which gives you a tag-like interface.

Add 'hierarchical' => true to your register_taxonomy.

Method 2

As of WP 3.7 (https://core.trac.wordpress.org/ticket/14206) you can add this argument to register_taxonomy:

'meta_box_cb' => 'post_categories_meta_box'

to get the built-in checkbox category style metabox without having to make your taxonomy hierarchical.

Also you could instead provide your own callback function to create your own metabox (i.e. with a dropdown).

Method 3

if you want to change the term of existing plugin to checkbox you need to edit the existing register_taxonomy().

add_action( 'init', 'change_room_term_to_checkbox', 999);
function change_room_term_to_checkbox()
{
    $tax = get_taxonomy('roomtype');
    $tax->meta_box_cb = 'post_categories_meta_box';
    $tax->hierarchical = true;
}

‘roomtype’ is the name of term used on register_taxonomy(‘roomtype’, array(…..

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