Boa dica pros amigos que precisam que suas taxonomias não hierárquicas (ou seja, as que funcionam como tags e usam um campo de texto para preenchimento) funcionem com uma interface um pouco mais amigável.
Basicamente, o código remove a meta box padrão criada pela taxonomia e adiciona a nova através de uma walker class personalizada, uma modificação da Walker_Category_Checklist. Essa classe é necessária para que seja feita a mudança dos valores dos inputs, pois as taxonomias hierárquicas são referenciadas por IDs, enquanto as que não possuem pais nem filhos usam o próprio slug registrado.
Criei um gist também para facilitar a localização do código.
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| <?php | |
| // Change this to your own taxonomy and post type | |
| new Tag_Checklist( 'taxonomy_name', 'post_type' ); | |
| /** | |
| * Use checkbox term selection for non-hierarchical taxonomies | |
| * | |
| * @author Hugh Lashbrooke | |
| * @link http://www.hughlashbrooke.com/wordpress-use-checkbox-term-selection-for-non-hierarchical-taxonomies/ | |
| */ | |
| class Tag_Checklist { | |
| private $taxonomy; | |
| private $post_type; | |
| function __construct( $taxonomy, $post_type ) { | |
| $this->taxonomy = $taxonomy; | |
| $this->post_type = $post_type; | |
| // Remove default taxonomy meta box | |
| add_action( 'admin_menu', array( $this, 'remove_meta_box' ) ); | |
| // Add new meta box | |
| add_action( 'add_meta_boxes', array( $this, 'add_meta_box' ) ); | |
| // Handle AJAX call for adding new term | |
| add_action( 'wp_ajax_add-' . $this->taxonomy , '_wp_ajax_add_non_hierarchical_term' ); | |
| } | |
| /** | |
| * Remove default meta box | |
| * @return void | |
| */ | |
| public function remove_meta_box() { | |
| remove_meta_box('tagsdiv-' . $this->taxonomy, $this->post_type, 'normal'); | |
| } | |
| /** | |
| * Add new metabox | |
| * @return void | |
| */ | |
| public function add_meta_box() { | |
| $tax = get_taxonomy( $this->taxonomy ); | |
| add_meta_box( 'taglist-' . $this->taxonomy, $tax->labels->name, array( $this, 'metabox_content' ), $this->post_type, 'side', 'core' ); | |
| } | |
| /** | |
| * Generate metabox content | |
| * @param obj $post Post object | |
| * @return void | |
| */ | |
| public function metabox_content( $post ) { | |
| $taxonomy = $this->taxonomy; | |
| $tax = get_taxonomy( $taxonomy ); | |
| ?> | |
| <div id="taxonomy-<?php echo $taxonomy; ?>" class="categorydiv"> | |
| <ul id="<?php echo $taxonomy; ?>-tabs" class="category-tabs"> | |
| <li class="tabs"><a href="#<?php echo $taxonomy; ?>-all"><?php echo $tax->labels->all_items; ?></a></li> | |
| <li class="hide-if-no-js"><a href="#<?php echo $taxonomy; ?>-pop"><?php _e( 'Most Used' ); ?></a></li> | |
| </ul> | |
| <div id="<?php echo $taxonomy; ?>-pop" class="tabs-panel" style="display: none;"> | |
| <ul id="<?php echo $taxonomy; ?>checklist-pop" class="categorychecklist form-no-clear" > | |
| <?php $popular_ids = wp_popular_terms_checklist( $taxonomy ); ?> | |
| </ul> | |
| </div> | |
| <div id="<?php echo $taxonomy; ?>-all" class="tabs-panel"> | |
| <input type="hidden" name="tax_input[<?php echo $taxonomy; ?>][]" value="0" /> | |
| <?php | |
| if( class_exists( 'Walker_Tag_Checklist' ) ) { | |
| $walker = new Walker_Tag_Checklist; | |
| } | |
| ?> | |
| <ul id="<?php echo $taxonomy; ?>checklist" data-wp-lists="list:<?php echo $taxonomy; ?>" class="categorychecklist form-no-clear"> | |
| <?php wp_terms_checklist($post->ID, array( 'taxonomy' => $taxonomy, 'popular_cats' => $popular_ids , 'walker' => $walker ) ) ?> | |
| </ul> | |
| </div> | |
| <?php if ( current_user_can($tax->cap->edit_terms) ) : ?> | |
| <div id="<?php echo $taxonomy; ?>-adder" class="wp-hidden-children"> | |
| <h4> | |
| <a id="<?php echo $taxonomy; ?>-add-toggle" href="#<?php echo $taxonomy; ?>-add" class="hide-if-no-js"> | |
| <?php | |
| /* translators: %s: add new taxonomy label */ | |
| printf( __( '+ %s' ), $tax->labels->add_new_item ); | |
| ?> | |
| </a> | |
| </h4> | |
| <p id="<?php echo $taxonomy; ?>-add" class="category-add wp-hidden-child"> | |
| <label class="screen-reader-text" for="new<?php echo $taxonomy; ?>"><?php echo $tax->labels->add_new_item; ?></label> | |
| <input type="text" name="new<?php echo $taxonomy; ?>" id="new<?php echo $taxonomy; ?>" class="form-required form-input-tip" value="<?php echo esc_attr( $tax->labels->new_item_name ); ?>" aria-required="true"/> | |
| <input type="button" id="<?php echo $taxonomy; ?>-add-submit" data-wp-lists="add:<?php echo $taxonomy ?>checklist:<?php echo $taxonomy ?>-add" class="button category-add-submit" value="<?php echo esc_attr( $tax->labels->add_new_item ); ?>" /> | |
| <?php wp_nonce_field( 'add-'.$taxonomy, '_ajax_nonce-add-'.$taxonomy, false ); ?> | |
| <span id="<?php echo $taxonomy; ?>-ajax-response"></span> | |
| </p> | |
| </div> | |
| <?php endif; ?> | |
| </div> | |
| <?php | |
| } | |
| } | |
| if( ! function_exists( '_wp_ajax_add_non_hierarchical_term' ) ) { | |
| /** | |
| * Mod of _wp_ajax_add_hierarchical_term to handle non-hierarchical taxonomies | |
| * @return void | |
| */ | |
| function _wp_ajax_add_non_hierarchical_term() { | |
| $action = $_POST['action']; | |
| $taxonomy = get_taxonomy( substr( $action, 4 ) ); | |
| check_ajax_referer( $action, '_ajax_nonce-add-' . $taxonomy->name ); | |
| if ( !current_user_can( $taxonomy->cap->edit_terms ) ) | |
| wp_die( –1 ); | |
| $names = explode( ',', $_POST['new'.$taxonomy->name] ); | |
| $parent = 0; | |
| if ( $taxonomy->name == 'category' ) | |
| $post_category = isset( $_POST['post_category'] ) ? (array) $_POST['post_category'] : array(); | |
| else | |
| $post_category = ( isset( $_POST['tax_input'] ) && isset( $_POST['tax_input'][$taxonomy->name] ) ) ? (array) $_POST['tax_input'][$taxonomy->name] : array(); | |
| $checked_categories = array_map( 'absint', (array) $post_category ); | |
| foreach ( $names as $tax_name ) { | |
| $tax_name = trim( $tax_name ); | |
| $category_nicename = sanitize_title( $tax_name ); | |
| if ( '' === $category_nicename ) | |
| continue; | |
| if ( ! $cat_id = term_exists( $tax_name, $taxonomy->name, $parent ) ) | |
| $cat_id = wp_insert_term( $tax_name, $taxonomy->name, array( 'parent' => $parent ) ); | |
| if ( is_wp_error( $cat_id ) ) | |
| continue; | |
| else if ( is_array( $cat_id ) ) | |
| $cat_id = $cat_id['term_id']; | |
| $checked_categories[] = $cat_id; | |
| if ( $parent ) // Do these all at once in a second | |
| continue; | |
| $new_term = get_term( $cat_id, $taxonomy->name ); | |
| $data = "\n<li id='{$taxonomy->name}-{$cat_id}'>" . '<label class="selectit"><input value="' . $new_term->slug . '" type="checkbox" name="tax_input['.$taxonomy->name.'][]" id="in-'.$taxonomy->name.'-' . $new_term->term_id . '"' . checked( in_array( $new_term->term_id, $checked_categories ), true, false ) . ' /> ' . esc_html( apply_filters('the_category', $new_term->name )) . '</label>'; | |
| $add = array( | |
| 'what' => $taxonomy->name, | |
| 'id' => $cat_id, | |
| 'data' => str_replace( array("\n", "\t"), '', $data ), | |
| 'position' => –1 | |
| ); | |
| } | |
| $x = new WP_Ajax_Response( $add ); | |
| $x->send(); | |
| } | |
| } | |
| /** | |
| * Mod of WP's Walker_Category_Checklist class | |
| */ | |
| class Walker_Tag_Checklist extends Walker { | |
| var $tree_type = 'tag'; | |
| var $db_fields = array ('parent' => 'parent', 'id' => 'term_id'); //TODO: decouple this | |
| function start_lvl( &$output, $depth = 0, $args = array() ) { | |
| $indent = str_repeat("\t", $depth); | |
| $output .= "$indent<ul class='children'>\n"; | |
| } | |
| function end_lvl( &$output, $depth = 0, $args = array() ) { | |
| $indent = str_repeat("\t", $depth); | |
| $output .= "$indent</ul>\n"; | |
| } | |
| function start_el( &$output, $tax_term, $depth, $args, $id = 0 ) { | |
| extract($args); | |
| if ( empty($taxonomy) ) | |
| $taxonomy = 'tag'; | |
| if ( $taxonomy == 'tag' ) | |
| $name = 'post_tag'; | |
| else | |
| $name = 'tax_input['.$taxonomy.']'; | |
| $class = in_array( $tax_term->term_id, $popular_cats ) ? ' class="popular-category"' : ''; | |
| $output .= "\n<li id='{$taxonomy}-{$tax_term->term_id}'$class>" . '<label class="selectit"><input value="' . $tax_term->slug . '" type="checkbox" name="'.$name.'[]" id="in-'.$taxonomy.'-' . $tax_term->term_id . '"' . checked( in_array( $tax_term->term_id, $selected_cats ), true, false ) . disabled( empty( $args['disabled'] ), false, false ) . ' /> ' . esc_html( apply_filters('the_category', $tax_term->name )) . '</label>'; | |
| } | |
| function end_el( &$output, $tax_term, $depth = 0, $args = array() ) { | |
| $output .= "</li>\n"; | |
| } | |
| } | |
| ?> |