WordPress How to use bootstrap navigation menu

This code you can used easily Bootstrap drop-down menu.

Under the ‘menu’ item in the array below you will need to change ‘main_nav’ to whatever name you decide to give your menu bar in the WordPress Admin Dashboard. That is the only location you need to change ‘main_nav’ as all the other references to ‘main_nav’ can remain.


/**
/* Class Name: wp_bootstrap_navwalker
/* Create new file as wp_bootstrap_navwalker.php or add this code in functions.php
/* 
/* if create file so Register Custom Navigation Walker.	 as like require_once('wp_bootstrap_navwalker.php');
/*/
class wp_bootstrap_navwalker extends Walker_Nav_Menu {	
	public function start_lvl( &$output, $depth = 0, $args = array() ) {
		$indent = str_repeat( "\t", $depth );
		$output .= "\n$indent<ul role=\"menu\" class=\" dropdown-menu\">\n";
	}

	public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
		$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
		/**
		 * Dividers, Headers or Disabled
		 * =============================
		 * 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
			 * ===========			
			 */
			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 );
		}
	}
	
	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
	 * =============	 
	 *
	 */
	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;
		}
	}
}

Register Walker in functions.php

/************/
/* Register Custom Navigation Walker
/************/
require_once('wp_bootstrap_navwalker.php');

Call Walker in header.php

/************/
/* Usage in your heder file.
/************/

 wp_nav_menu( array(
                'menu'              => 'primary',
                'theme_location'    => 'primary',
                'depth'             => 2,
                'container'         => 'div',
                'container_class'   => 'collapse navbar-collapse',
        'container_id'      => 'bs-example-navbar-collapse-1',
                'menu_class'        => 'nav navbar-nav',
                'fallback_cb'       => 'wp_bootstrap_navwalker::fallback',
                'walker'            => new wp_bootstrap_navwalker())
            );

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