This library of code/plugin will allow you to change the default WordPress Taxonomy display for a specific Taxonomy to a Radio Button Single Select display.
GitHub Source and Read More at WebDev Studios
Includes the capabilities to:
- Choose Radio or Single Select Drop Down
- Choose a Default Value
- Disable the Add-New Option for the Taxonomy
Use the GitHub Source above, but including the Code snippet for reference:
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<?php if ( !class_exists( 'WDS_Taxonomy_Radio' ) ) { /** * Removes and replaces the built-in taxonomy metabox with our radio-select metabox. * @link http://codex.wordpress.org/Function_Reference/add_meta_box#Parameters */ class WDS_Taxonomy_Radio { // Post types where metabox should be replaced (defaults to all post_types associated with taxonomy) public $post_types = array(); // Taxonomy slug public $slug = ''; // Taxonomy object public $taxonomy = false; // New metabox title. Defaults to Taxonomy name public $metabox_title = ''; // Metabox priority. (vertical placement) // 'high', 'core', 'default' or 'low' public $priority = 'high'; // Metabox position. (column placement) // 'normal', 'advanced', or 'side' public $context = 'side'; // Set to true to hide "None" option & force a term selection public $force_selection = false; /** * Initiates our metabox action * @param string $tax_slug Taxonomy slug * @param array $post_types post-types to display custom metabox */ public function __construct( $tax_slug, $post_types = array() ) { $this->slug = $tax_slug; $this->post_types = is_array( $post_types ) ? $post_types : array( $post_types ); add_action( 'add_meta_boxes', array( $this, 'add_radio_box' ) ); } /** * Removes and replaces the built-in taxonomy metabox with our own. */ public function add_radio_box() { foreach ( $this->post_types() as $key => $cpt ) { // remove default category type metabox remove_meta_box( $this->slug .'div', $cpt, 'side' ); // remove default tag type metabox remove_meta_box( 'tagsdiv-'.$this->slug, $cpt, 'side' ); // add our custom radio box add_meta_box( $this->slug .'_radio', $this->metabox_title(), array( $this, 'radio_box' ), $cpt, $this->context, $this->priority ); } } /** * Displays our taxonomy radio box metabox */ public function radio_box() { // uses same noncename as default box so no save_post hook needed wp_nonce_field( 'taxonomy_'. $this->slug, 'taxonomy_noncename' ); // get terms associated with this post $names = wp_get_object_terms( get_the_ID(), $this->slug ); // get all terms in this taxonomy $terms = (array) get_terms( $this->slug, 'hide_empty=0' ); // filter the ids out of the terms $existing = ( !is_wp_error( $names ) && !empty( $names ) ) ? (array) wp_list_pluck( $names, 'term_id' ) : array(); // Check if taxonomy is hierarchical // Terms are saved differently between types $h = $this->taxonomy()->hierarchical; // default value $default_val = $h ? 0 : ''; // input name $name = $h ? 'tax_input['. $this->slug .'][]' : 'tax_input['. $this->slug .']'; echo '<div style="margin-bottom: 5px;"> <ul id="'. $this->slug .'_taxradiolist" data-wp-lists="list:'. $this->slug .'_tax" class="categorychecklist form-no-clear">'; // If 'category,' force a selection, or force_selection is true if ( $this->slug != 'category' && !$this->force_selection ) { // our radio for selecting none echo '<li id="'. $this->slug .'_tax-0"><label><input value="'. $default_val .'" type="radio" name="'. $name .'" id="in-'. $this->slug .'_tax-0" '; checked( empty( $existing ) ); echo '> '. sprintf( __( 'No %s', 'wds' ), $this->taxonomy()->labels->singular_name ) .'</label></li>'; } // loop our terms and check if they're associated with this post foreach ( $terms as $term ) { $val = $h ? $term->term_id : $term->slug; echo '<li id="'. $this->slug .'_tax-'. $term->term_id .'"><label><input value="'. $val .'" type="radio" name="'. $name .'" id="in-'. $this->slug .'_tax-'. $term->term_id .'" '; // if so, they get "checked" checked( !empty( $existing ) && in_array( $term->term_id, $existing ) ); echo '> '. $term->name .'</label></li>'; } echo '</ul></div>'; } /** * Gets the taxonomy object from the slug * @return object Taxonomy object */ public function taxonomy() { $this->taxonomy = $this->taxonomy ? $this->taxonomy : get_taxonomy( $this->slug ); return $this->taxonomy; } /** * Gets the taxonomy's associated post_types * @return array Taxonomy's associated post_types */ public function post_types() { $this->post_types = !empty( $this->post_types ) ? $this->post_types : $this->taxonomy()->object_type; return $this->post_types; } /** * Gets the metabox title from the taxonomy object's labels (or uses the passed in title) * @return string Metabox title */ public function metabox_title() { $this->metabox_title = !empty( $this->metabox_title ) ? $this->metabox_title : $this->taxonomy()->labels->name; return $this->metabox_title; } } $custom_tax_mb = new WDS_Taxonomy_Radio( 'custom-tax-slug' ); // Update optional properties // $custom_tax_mb->priority = 'low'; // $custom_tax_mb->context = 'normal'; // $custom_tax_mb->metabox_title = __( 'Custom Metabox Title', 'yourtheme' ); // $custom_tax_mb->force_selection = true; } |