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Nav walker: Display 3rd level items under 2nd level

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I am using the WP_navwalker for a dropdown menu. This works fine, but it only shows me the first and second level items. So de dropdown on the first level and a regular second item when dropdown is open. The third level is not visible. I want to display it under my second level items.

I am not skilled enough to properly edit the walker to fit make it fit my needs. can anyone help me?

The naw_walker code:

<?php /** * Menu Walker * * @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. * @param object $args Arguments. */ public function start_lvl(&$output, $depth = 0, $args = array()) { $indent = str_repeat("\t", $depth); $output .= "\n$indent<ul role=\"menu\" class=\" dvt-nav-dropdown closed\">\n"; } /** * Bootstrap Menu Walker start * * @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 object $args Arguments. * @param int    $id Menu item ID. */ public function start_el(&$output, $item, $depth = 0, $args = array(), $id = 0) { // Set level of indent. $indent = ($depth) ? str_repeat("\t", $depth) : ''; // Create nav menu item. $nav_menu_atts = array(); $nav_menu_atts['id'] = apply_filters('nav_menu_item_id', 'menu-item-' . $item->ID, $item, $args); $nav_menu_atts['class'] = empty($item->classes) ? array() : (array) $item->classes; $nav_menu_atts['class'] = apply_filters('nav_menu_css_class', $nav_menu_atts['class'], $item, $args); // Create link attributes. $nav_menu_link_atts = array(); $nav_menu_link_atts['title']  = ! empty($item->title)  ? $item->title  : ''; $nav_menu_link_atts['target'] = ! empty($item->target) ? $item->target : ''; $nav_menu_link_atts['rel']    = ! empty($item->xfn)    ? $item->xfn    : ''; // If item has_children add atts to a. $nav_menu_link_atts['href'] = $args->has_children && 0 === $depth ? '#' : (!empty($item->url) ? $item->url : ''); $nav_menu_link_atts = apply_filters('nav_menu_link_attributes', $nav_menu_link_atts, $item, $args); // Output LI menu item. $output .= $indent; $output .= '<li'; // Output menu attributes. foreach ($nav_menu_atts as $attr => $value) { // Output attribute name. $output .= ' ' . esc_attr($attr); if (!empty($value)) { $output .= '="'; // Add switch to handle escaping. switch ($attr) { case 'class': $output .= esc_attr(join(' ', array_filter($value))); break; default: $output .= esc_attr($value); break; } $output .= '"'; } } $output .= '>'; // Output A link. $item_output = $args->before; $item_output .= '<a'; // Output link attributes. foreach ($nav_menu_link_atts as $attr => $value) { if (!empty($value)) { // Output attribute name. $item_output .= ' ' . esc_attr($attr) . '="'; // Add switch to handle escaping. switch ($attr) { case 'href': $item_output .= esc_url($value); break; case 'class': $item_output .= esc_attr(join(' ', array_filter($value))); break; default: $item_output .= esc_attr($value); break; } $item_output .= '"'; } } $item_output .= '>'; $item_output .= $args->link_before . apply_filters('the_title', $item->title, $item->ID) . $args->link_after; $item_output .= '</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 Arguments. * @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')) { $fb_output = null; if ($args['container']) { echo '<' . esc_html($args['container']); if ($args['container_id']) { echo ' id="' . esc_attr($args['container_id']) . '"'; } if ($args['container_class']) { echo ' class="' . esc_attr($args['container_class']) . '"'; } echo '>'; } echo '<ul'; if ($args['menu_id']) { echo ' id="' . esc_attr($args['menu_id']) . '"'; } if ($args['menu_class']) { echo ' class="' . esc_attr($args['menu_class']) . '"'; } echo '>'; echo '</ul>'; if ($args['container']) { echo '</' . esc_html($args['container']) . '>'; } } }

}

Sorry for my English, thanks in advance!