Bootstrap Nav Walker - Add a class to the child UL - multi-level menu

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I'm working on a Wordpress site that someone else coded using Bootstrap. I added a submenu item to a submenu item, but it is appearing on top of it's parent, rather than under it.

I found code that would add a class to the submenu, but I need to add a class to the child of the submenu item.

Parent - A Submenu (child of main menu) --A1 Submenu (child of A)

I created a dropdown-submenu class in the css file, but I don't know how or where to add it to the wp_bootstrap_navwalker.php file. Code is below.

<?php

/**
 * Class Name: wp_bootstrap_navwalker
 * GitHub URI: https://github.com/twittem/wp-bootstrap-

navwalker
 * Description: A custom WordPress nav walker class to 

implement the Bootstrap 3 navigation style in a custom theme 

using the WordPress built in menu manager.
 * Version: 2.0.4
 * Author: Edward McIntyre - @twittem
 * License: GPL-2.0+
 * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
 */

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'] = ! empty( $item->url ) ? 

$item->url : '';
                // $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>&nbsp;';
            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;
        }
    }
}


You could try this: add this to your styles.css, it's work for me:

/* dropdown */
.dropdown-menu {
    margin: 0px auto;
}
.dropdown-menu .dropdown-menu {
    left: 100%;
    top: 0px;
}
/*  shows the dropdown on hover*/
.navbar ul.nav li:hover > ul.dropdown-menu {
    display: block;
}
/* before and after */
.navbar .nav > li > .dropdown-menu::before, .navbar .nav > li > .dropdown-menu::after {
    display: none;
}