WordPress walker for ZURB's Foundation Nav Bar classes

readme.txt

This code should be added to the WordPress functions.php file.

Call the menu in your theme by using <?php foundation_nav_bar(); ?>

Setup a menu in WordPress admin under Appearance > Menus

Note: the function main_nav_fb() could be used to echo an error instead of wp_list_pages as a menu. If you choose to not use wp_list_pages the page_walker is not needed.

foundation-menu.php

add_theme_support( 'menus' ); 

/*
http://codex.wordpress.org/Function_Reference/register_nav_menus#Examples
*/
register_nav_menus( array(
	'main-menu' => 'Main Menu' // registers the menu in the WordPress admin menu editor
) );


/* 
http://codex.wordpress.org/Function_Reference/wp_nav_menu 
*/
function foundation_nav_bar() {
    wp_nav_menu(array( 
    	'container' => false,
    	'container_class' => '',
    	'menu' => 'Main Menu',
    	'menu_class' => 'nav-bar',         // this adds the Foundation nav-bar class to the menu
    	'theme_location' => 'main-menu',
    	'before' => '',
        'after' => '',
        'link_before' => '',
        'link_after' => '',
        'depth' => 2,                      // Foundation Nav Bar only supports 2 levels
    	'fallback_cb' => 'main_nav_fb',    // this uses the below function to list pages as a menu
	'walker' => new nav_walker()       // this calls the walker for Foundation classes and descriptions
	));
}


/*
http://codex.wordpress.org/Template_Tags/wp_list_pages
*/
function main_nav_fb() {
	echo '<ul class="nav-bar">';
	wp_list_pages(array(
		'depth'        => 0,
		'child_of'     => 0,
		'exclude'      => '',
		'include'      => '',
		'title_li'     => '',
		'echo'         => 1,
		'authors'      => '',
		'sort_column'  => 'menu_order, post_title',
		'link_before'  => '',
		'link_after'   => '',
		'walker'       => new page_walker(),
		'post_type'    => 'page',
		'post_status'  => 'publish' 
	));
	echo '</ul>';
}

foundation-nav-walker.php

/* 
Customize the output of menus for Foundation nav classes and add descriptions

http://www.kriesi.at/archives/improve-your-wordpress-navigation-menu-output
http://wikiduh.com/1541/custom-nav-menu-walker-function-to-add-classes
http://code.hyperspatial.com/1514/twitter-bootstrap-walker-classes/ 
*/
class nav_walker extends Walker_Nav_Menu {
	function start_el(&$output, $item, $depth, $args) {
		global $wp_query;
		
		$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

		$class_names = $value = '';

		$classes = empty( $item->classes ) ? array() : (array) $item->classes;
		
		if (in_array( 'current-menu-item', $classes )){$classes[]= 'active';}
		if ($args->has_children){$classes[] = 'has-flyout';}

		$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
        $class_names = strlen( trim( $class_names ) ) > 0 ? ' class="' . esc_attr( $class_names ) . '"' : '';

		$output .= $indent . '<li id="menu-item-'. $item->ID . '"' . $value . $class_names .'>';

		$attributes  = ! empty( $item->attr_title ) ? ' title="'  . esc_attr( $item->attr_title ) .'"' : '';
		$attributes .= ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
		$attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
		$attributes .= ! empty( $item->url )        ? ' href="'   . esc_attr( $item->url        ) .'"' : '';
		$attributes .= ! empty( $item->description ) ? ' class="has-desc"' : '';

		$description  = ! empty( $item->description ) ? '<span class="nav-desc">'.esc_attr( $item->description ).'</span>' : '';

		$item_output = $args->before;
		$item_output .= '<a'. $attributes .'>';
		$item_output .= $args->link_before .apply_filters( 'the_title', $item->title, $item->ID );
		$item_output .= $description.$args->link_after;
           	if ( $args->has_children && $depth == 0 ) {
               		$item_output .= '</a><a href="#" class="flyout-toggle"><span> </span></a>';
           	 } else {
                	$item_output .= '</a>';
            	}
		$item_output .= $args->after;

		$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
	}
    function end_el(&$output, $item, $depth) {
        $output .= "</li>\n";
    }
			
	function start_lvl(&$output, $depth) {
		$indent = str_repeat("\t", $depth);
		$output .= "\n$indent<ul class=\"sub-menu flyout\">\n";
	}
    function end_lvl(&$output, $depth) {
        $indent = str_repeat("\t", $depth);
        $output .= "\n$indent</ul>\n";
    }
				
	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 );
	}  	
	
} /* end nav walker */

foundation-page-walker.php

/*
Customize the output of page list for Foundation nav classes in main_nav_fb

http://forrst.com/posts/Using_Short_Page_Titles_for_wp_list_pages_Wordp-uV9
*/
class page_walker extends Walker_Page {
	function start_el(&$output, $page, $depth, $args, $current_page) {
		
	$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

		extract($args, EXTR_SKIP);
		$classes = array('page_item', 'page-item-'.$page->ID);
		if ( !empty($current_page) ) {
			$_current_page = get_page( $current_page );
			if ( isset($_current_page->ancestors) && in_array($page->ID, (array) $_current_page->ancestors) )
				$classes[] = 'current_page_ancestor';
			if ( $page->ID == $current_page )
				$classes[] = 'current_page_item active';
			elseif ( $_current_page && $page->ID == $_current_page->post_parent )
				$classes[] = 'current_page_parent';
		} elseif ( $page->ID == get_option('page_for_posts') ) {
			$classes[] = 'current_page_parent';
		}
		if ( get_children( $page->ID ) )
			$classes[] = 'has-flyout';
		
		$classes = implode(' ', apply_filters('page_css_class', $classes, $page));
		
		$output .= $indent . '<li class="' . $classes . '"><a href="' . get_page_link($page->ID) . '" title="' . esc_attr( wp_strip_all_tags( $page->post_title ) ) . '">' . $args['link_before'] . $page->post_title . $args['link_after'] . '</a>';

	}
    function end_el(&$output, $item, $depth) {
        $output .= "</li>\n";
    }
	
    function start_lvl(&$output, $depth) {
        $indent = str_repeat("\t", $depth);
        $output .= "\n$indent<ul class=\"sub-menu flyout\">\n";
    }
    function end_lvl(&$output, $depth) {
        $indent = str_repeat("\t", $depth);
        $output .= "\n$indent</ul>\n";
    }
	
} /* end page walker */

That's Awesome, thanks!