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has_children in custom nav_walker

J'essaie de créer un menu personnalisé. J'ai ajouté le code ci-dessous

function display_element( $element, &$children_elements, $max_depth, $depth=0, $args, &$output )
{
    $id_field = $this->db_fields['id'];
    if ( is_object( $args[0] ) ) {
        $args[0]->has_children = ! empty( $children_elements[$element->$id_field] );
    }
    return parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output );
}

En conséquence, je peux utiliser l’instruction if ($ args-> has_children) dans ma fonction start_el. Malheureusement, le même code ne semble pas fonctionner dans la fonction end_el.

Code entier:

class CSS_Menu_Walker2 extends Walker {
  /**
   * What the class handles.
   *
   * @see Walker::$tree_type
   * @since 3.0.0
   * @var string
   */
  public $tree_type = array( 'post_type', 'taxonomy', 'custom' );

  /**
   * Database fields to use.
   *
   * @see Walker::$db_fields
   * @since 3.0.0
   * @todo Decouple this.
   * @var array
   */
  public $db_fields = array( 'parent' => 'menu_item_parent', 'id' => 'db_id' );

  /**
   * Starts the list before the elements are added.
   *
   * @see Walker::start_lvl()
   *
   * @since 3.0.0
   *
   * @param string $output Passed by reference. Used to append additional content.
   * @param int    $depth  Depth of menu item. Used for padding.
   * @param array  $args   An array of arguments. @see wp_nav_menu()
   */
  public function start_lvl( &$output, $depth = 0, $args = array() ) {
    $indent = str_repeat("\t", $depth);
    $output .= "\n$indent <div class=\"collapsible-body\"> <ul class=\"sub-menu\">\n";
  }

  /**
   * Ends the list of after the elements are added.
   *
   * @see Walker::end_lvl()
   *
   * @since 3.0.0
   *
   * @param string $output Passed by reference. Used to append additional content.
   * @param int    $depth  Depth of menu item. Used for padding.
   * @param array  $args   An array of arguments. @see wp_nav_menu()
   */
  public function end_lvl( &$output, $depth = 0, $args = array() ) {
    $indent = str_repeat("\t", $depth);

    $output .= "$indent</ul></div>\n";
  }

  /**
   * Start the element output.
   *
   * @see Walker::start_el()
   *
   * @since 3.0.0
   *
   * @param string $output Passed by reference. Used to append additional content.
   * @param object $item   Menu item data object.
   * @param int    $depth  Depth of menu item. Used for padding.
   * @param array  $args   An array of arguments. @see wp_nav_menu()
   * @param int    $id     Current item ID.
   */


    function display_element( $element, &$children_elements, $max_depth, $depth=0, $args, &$output )
    {
        $id_field = $this->db_fields['id'];
        if ( is_object( $args[0] ) ) {
            $args[0]->has_children = ! empty( $children_elements[$element->$id_field] );
        }
        return parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output );
    }



  public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {


    $indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

    $classes = empty( $item->classes ) ? array() : (array) $item->classes;
    $classes[] = 'menu-item-' . $item->ID;

    /**
     * Filter the CSS class(es) applied to a menu item's list item element.
     *
     * @since 3.0.0
     * @since 4.1.0 The `$depth` parameter was added.
     *
     * @param array  $classes The CSS classes that are applied to the menu item's `<li>` element.
     * @param object $item    The current menu item.
     * @param array  $args    An array of {@see wp_nav_menu()} arguments.
     * @param int    $depth   Depth of menu item. Used for padding.
     */
    $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args, $depth ) );
    $class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';

    /**
     * Filter the ID applied to a menu item's list item element.
     *
     * @since 3.0.1
     * @since 4.1.0 The `$depth` parameter was added.
     *
     * @param string $menu_id The ID that is applied to the menu item's `<li>` element.
     * @param object $item    The current menu item.
     * @param array  $args    An array of {@see wp_nav_menu()} arguments.
     * @param int    $depth   Depth of menu item. Used for padding.
     */
    $id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args, $depth );
    $id = $id ? ' id="' . esc_attr( $id ) . '"' : '';

    if ( $args->has_children ) {
    $output .= $indent .  '<ul class="collapsible collapsible-accordion">';
    $output .= $indent . '<a class="collapsible-header  waves-effect waves-teal ">';
    }
    $output .= $indent . '<li' . $id . $class_names .'>';

    $atts = array();
    $atts['title']  = ! empty( $item->attr_title ) ? $item->attr_title : '';
    $atts['target'] = ! empty( $item->target )     ? $item->target     : '';
    $atts['rel']    = ! empty( $item->xfn )        ? $item->xfn        : '';
    $atts['href']   = ! empty( $item->url )        ? $item->url        : '';

    /**
     * Filter the HTML attributes applied to a menu item's anchor element.
     *
     * @since 3.6.0
     * @since 4.1.0 The `$depth` parameter was added.
     *
     * @param array $atts {
     *     The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored.
     *
     *     @type string $title  Title attribute.
     *     @type string $target Target attribute.
     *     @type string $rel    The rel attribute.
     *     @type string $href   The href attribute.
     * }
     * @param object $item  The current menu item.
     * @param array  $args  An array of {@see wp_nav_menu()} arguments.
     * @param int    $depth Depth of menu item. Used for padding.
     */
    $atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args, $depth );

    $attributes = '';
    foreach ( $atts as $attr => $value ) {
      if ( ! empty( $value ) ) {
        $value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
        $attributes .= ' ' . $attr . '="' . $value . '"';
      }
    }

    $item_output = $args->before;
    if (!$args->has_children ) 
    $item_output .= '<a'. $attributes .'>';
    /** This filter is documented in wp-includes/post-template.php */
    $item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
    if (!$args->has_children ) 
    $item_output .= '</a>';
    $item_output .= $args->after;



    /**
     * Filter a menu item's starting output.
     *
     * The menu item's starting output only includes `$args->before`, the opening `<a>`,
     * the menu item's title, the closing `</a>`, and `$args->after`. Currently, there is
     * no filter for modifying the opening and closing `<li>` for a menu item.
     *
     * @since 3.0.0
     *
     * @param string $item_output The menu item's starting HTML output.
     * @param object $item        Menu item data object.
     * @param int    $depth       Depth of menu item. Used for padding.
     * @param array  $args        An array of {@see wp_nav_menu()} arguments.
     */
    $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );

  }

  /**
   * Ends the element output, if needed.
   *
   * @see Walker::end_el()
   *
   * @since 3.0.0
   *
   * @param string $output Passed by reference. Used to append additional content.
   * @param object $item   Page data object. Not used.
   * @param int    $depth  Depth of page. Not Used.
   * @param array  $args   An array of arguments. @see wp_nav_menu()
   */
  public function end_el( &$output, $item, $depth = 0, $args = array() ) {

    $output .= "</li>\n";

  }

} // Walker_Nav_Menu
?>
a

Est-ce que je fais quelque chose de mal?

menusnavigationwalker
1
Dawid Adach

J'ai le même problème. Certaines réponses prétendent que vous pouvez utiliser $args->has_children ou $args[0]->has_children, mais il n'est jamais ajouté à $ args. Parfois, has_children est ajouté sous $args->walker->has_children, mais il est toujours défini sur false, autrement dit, inutile ...

En guise de solution de contournement, le modèle actuel que j'utilise ajoute une classe aux éléments contenant des enfants (menu-item-has-children). Je l'ai donc recherché sous $item->classes.

function end_el( &$output, $item, $depth = 0, $args = array() ) {

    if( !empty($item->classes) && 
        is_array($item->classes) && 
        in_array('menu-item-has-children', $item->classes) ){

        // This guy has children

    }
}

Je suppose que vous pourriez ajouter une marque dans votre fonction start_el puis la rechercher ...

J'espère que ça aide. Si vous avez une meilleure solution, merci de la partager.

3
Jorge Raigoza