[Summary view] [Print] [Text view]

   1  <?php
   2  /**
   3   * Server-side rendering of the `core/categories` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Renders the `core/categories` block on server.
  10   *
  11   * @param array $attributes The block attributes.
  12   *
  13   * @return string Returns the categories list/dropdown markup.
  14   */
  15  function render_block_core_categories( $attributes ) {
  16      static $block_id = 0;
  17      ++$block_id;
  18  
  19      $args = array(
  20          'echo'         => false,
  21          'hierarchical' => ! empty( $attributes['showHierarchy'] ),
  22          'orderby'      => 'name',
  23          'show_count'   => ! empty( $attributes['showPostCounts'] ),
  24          'title_li'     => '',
  25          'hide_empty'   => empty( $attributes['showEmpty'] ),
  26      );
  27      if ( ! empty( $attributes['showOnlyTopLevel'] ) && $attributes['showOnlyTopLevel'] ) {
  28          $args['parent'] = 0;
  29      }
  30  
  31      if ( ! empty( $attributes['displayAsDropdown'] ) ) {
  32          $id                       = 'wp-block-categories-' . $block_id;
  33          $args['id']               = $id;
  34          $args['show_option_none'] = __( 'Select Category' );
  35          $wrapper_markup           = '<div %1$s><label class="screen-reader-text" for="' . esc_attr( $id ) . '">' . __( 'Categories' ) . '</label>%2$s</div>';
  36          $items_markup             = wp_dropdown_categories( $args );
  37          $type                     = 'dropdown';
  38  
  39          if ( ! is_admin() ) {
  40              // Inject the dropdown script immediately after the select dropdown.
  41              $items_markup = preg_replace(
  42                  '#(?<=</select>)#',
  43                  build_dropdown_script_block_core_categories( $id ),
  44                  $items_markup,
  45                  1
  46              );
  47          }
  48      } else {
  49          $wrapper_markup = '<ul %1$s>%2$s</ul>';
  50          $items_markup   = wp_list_categories( $args );
  51          $type           = 'list';
  52      }
  53  
  54      $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => "wp-block-categories-{$type}" ) );
  55  
  56      return sprintf(
  57          $wrapper_markup,
  58          $wrapper_attributes,
  59          $items_markup
  60      );
  61  }
  62  
  63  /**
  64   * Generates the inline script for a categories dropdown field.
  65   *
  66   * @param string $dropdown_id ID of the dropdown field.
  67   *
  68   * @return string Returns the dropdown onChange redirection script.
  69   */
  70  function build_dropdown_script_block_core_categories( $dropdown_id ) {
  71      ob_start();
  72      ?>
  73      <script>
  74      ( function() {
  75          var dropdown = document.getElementById( '<?php echo esc_js( $dropdown_id ); ?>' );
  76  		function onCatChange() {
  77              if ( dropdown.options[ dropdown.selectedIndex ].value > 0 ) {
  78                  location.href = "<?php echo esc_url( home_url() ); ?>/?cat=" + dropdown.options[ dropdown.selectedIndex ].value;
  79              }
  80          }
  81          dropdown.onchange = onCatChange;
  82      })();
  83      </script>
  84      <?php
  85      return wp_get_inline_script_tag( str_replace( array( '<script>', '</script>' ), '', ob_get_clean() ) );
  86  }
  87  
  88  /**
  89   * Registers the `core/categories` block on server.
  90   */
  91  function register_block_core_categories() {
  92      register_block_type_from_metadata(
  93          __DIR__ . '/categories',
  94          array(
  95              'render_callback' => 'render_block_core_categories',
  96          )
  97      );
  98  }
  99  add_action( 'init', 'register_block_core_categories' );