我正在使用WP\\U bootstrap\\U navwalker作为下拉菜单。这很好，但它只显示了第一级和第二级项目。因此，当下拉列表打开时，在第一级取消下拉列表，并在第二级常规取消下拉列表。第三层不可见。
我想在我的第二级项目下显示它。walker现在正在将其作为另一个下拉列表（不起作用）。
我没有足够的技能来正确编辑助行器，使其适合我的需要。有人能帮我吗？
沃克密码：
class wp_bootstrap_navwalker extends Walker_Nav_Menu {
/**
* @see Walker::start_lvl()
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of page. Used for padding.
*/
public function start_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat( "\\t", $depth );
$output .= "\\n$indent<ul role=\\"menu\\" class=\\" dropdown-menu\\">\\n";
}
/**
* @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 int $current_page Menu item ID.
* @param object $args
*/
public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
$indent = ( $depth ) ? str_repeat( "\\t", $depth ) : \'\';
/**
* Dividers, Headers or Disabled
* =============================
* Determine whether the item is a Divider, Header, Disabled or regular
* menu item. To prevent errors we use the strcasecmp() function to so a
* comparison that is not case sensitive. The strcasecmp() function returns
* a 0 if the strings are equal.
*/
if ( strcasecmp( $item->attr_title, \'divider\' ) == 0 && $depth === 1 ) {
$output .= $indent . \'<li role="presentation" class="divider">\';
} else if ( strcasecmp( $item->title, \'divider\') == 0 && $depth === 1 ) {
$output .= $indent . \'<li role="presentation" class="divider">\';
} else if ( strcasecmp( $item->attr_title, \'dropdown-header\') == 0 && $depth === 1 ) {
$output .= $indent . \'<li role="presentation" class="dropdown-header">\' . esc_attr( $item->title );
} else if ( strcasecmp($item->attr_title, \'disabled\' ) == 0 ) {
$output .= $indent . \'<li role="presentation" class="disabled"><a href="#">\' . esc_attr( $item->title ) . \'</a>\';
} else {
$class_names = $value = \'\';
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$classes[] = \'menu-item-\' . $item->ID;
$class_names = join( \' \', apply_filters( \'nav_menu_css_class\', array_filter( $classes ), $item, $args ) );
if ( $args->has_children )
$class_names .= \' dropdown\';
if ( in_array( \'current-menu-item\', $classes ) )
$class_names .= \' active\';
$class_names = $class_names ? \' class="\' . esc_attr( $class_names ) . \'"\' : \'\';
$id = apply_filters( \'nav_menu_item_id\', \'menu-item-\'. $item->ID, $item, $args );
$id = $id ? \' id="\' . esc_attr( $id ) . \'"\' : \'\';
$output .= $indent . \'<li\' . $id . $value . $class_names .\'>\';
$atts = array();
$atts[\'title\'] = ! empty( $item->title ) ? $item->title : \'\';
$atts[\'target\'] = ! empty( $item->target ) ? $item->target : \'\';
$atts[\'rel\'] = ! empty( $item->xfn ) ? $item->xfn : \'\';
// If item has_children add atts to a.
if ( $args->has_children && $depth === 0 ) {
$atts[\'href\'] = \'#\';
$atts[\'data-toggle\'] = \'dropdown\';
$atts[\'class\'] = \'dropdown-toggle\';
$atts[\'aria-haspopup\'] = \'true\';
} else {
$atts[\'href\'] = ! empty( $item->url ) ? $item->url : \'\';
}
$atts = apply_filters( \'nav_menu_link_attributes\', $atts, $item, $args );
$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;
/*
* Glyphicons
* ===========
* Since the the menu item is NOT a Divider or Header we check the see
* if there is a value in the attr_title property. If the attr_title
* property is NOT null we apply it as the class name for the glyphicon.
*/
if ( ! empty( $item->attr_title ) )
$item_output .= \'<a\'. $attributes .\'><span class="glyphicon \' . esc_attr( $item->attr_title ) . \'"></span> \';
else
$item_output .= \'<a\'. $attributes .\'>\';
$item_output .= $args->link_before . apply_filters( \'the_title\', $item->title, $item->ID ) . $args->link_after;
$item_output .= ( $args->has_children && 0 === $depth ) ? \' <span class="caret"></span></a>\' : \'</a>\' ;
$item_output .= $args->after;
$output .= apply_filters( \'walker_nav_menu_start_el\', $item_output, $item, $depth, $args );
}
}
/**
* Traverse elements to create list from elements.
*
* Display one element if the element doesn\'t have any children otherwise,
* display the element and its children. Will only traverse up to the max
* depth and no ignore elements under that depth.
*
* This method shouldn\'t be called directly, use the walk() method instead.
*
* @see Walker::start_el()
* @since 2.5.0
*
* @param object $element Data object
* @param array $children_elements List of elements to continue traversing.
* @param int $max_depth Max depth to traverse.
* @param int $depth Depth of current element.
* @param array $args
* @param string $output Passed by reference. Used to append additional content.
* @return null Null on failure with no changes to parameters.
*/
public function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
if ( ! $element )
return;
$id_field = $this->db_fields[\'id\'];
// Display this element.
if ( is_object( $args[0] ) )
$args[0]->has_children = ! empty( $children_elements[ $element->$id_field ] );
parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output );
}
/**
* Menu Fallback
* =============
* If this function is assigned to the wp_nav_menu\'s fallback_cb variable
* and a manu has not been assigned to the theme location in the WordPress
* menu manager the function with display nothing to a non-logged in user,
* and will add a link to the WordPress menu manager if logged in as an admin.
*
* @param array $args passed from the wp_nav_menu function.
*
*/
public static function fallback( $args ) {
if ( current_user_can( \'manage_options\' ) ) {
extract( $args );
$fb_output = null;
if ( $container ) {
$fb_output = \'<\' . $container;
if ( $container_id )
$fb_output .= \' id="\' . $container_id . \'"\';
if ( $container_class )
$fb_output .= \' class="\' . $container_class . \'"\';
$fb_output .= \'>\';
}
$fb_output .= \'<ul\';
if ( $menu_id )
$fb_output .= \' id="\' . $menu_id . \'"\';
if ( $menu_class )
$fb_output .= \' class="\' . $menu_class . \'"\';
$fb_output .= \'>\';
$fb_output .= \'<li><a href="\' . admin_url( \'nav-menus.php\' ) . \'">Add a menu</a></li>\';
$fb_output .= \'</ul>\';
if ( $container )
$fb_output .= \'</\' . $container . \'>\';
echo $fb_output;
}
}
}
对不起我的英语，提前谢谢！
