Use radio input instead of checkbox on Select Category – WordPress

1 comment

1. You can use this helper class, so the code will look like this

   <?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( 'category', array('community') );
   
      // 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;
   
   }
   

   Source: How to Replace WordPress Default Taxonomy Metabox – WebDevStudios

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