WordPress Menu & Walker for ZURB's Foundation 4 Sections

readme.txt

Adding a Foundation Horizontal or Vertical Section to WordPress as a menu
---

foundation-section-menu.php and foundation-section-walker.php should be included in the WordPress functions.php file.
 
The code in foundation-sectionr.php should be added to a template (ie. header.php)
Note: replace horizontal with vertical for the vertical section
 
Setup a menu in WordPress admin under Appearance > Menus
 
Foundation Top Bar Doc: http://foundation.zurb.com/docs/components/section.html

foundation4-section-menu.php

<?php
add_theme_support('menus');
 
/**
 * http://codex.wordpress.org/Function_Reference/register_nav_menus#Examples
 */
register_nav_menus(array(
  'main-menu' => 'Main Menu',
));

/**
 * http://codex.wordpress.org/Function_Reference/wp_nav_menu
 */
function foundation_section_menu() {
	$defaults = array( 
		'theme_location'  => 'main-menu',
		'menu'            => '',
		'container'       => false,
		'container_class' => '',
		'container_id'    => '',
		'menu_class'      => 'nav-bar',
		'menu_id'         => '',
		'echo'            => true,
		'fallback_cb'     => false,
		'before'          => '',
		'after'           => '',
		'link_before'     => '',
		'link_after'      => '',
		'items_wrap'      => '%3$s',
		'depth'           => 2,
		'walker'          => new Section_Nav_Walker()
		);    
	wp_nav_menu( $defaults );
}
?>

foundation4-section-walker.php

<?php
/**
 * Section Nav Walker
 * used for accordion side menu and horizontal main menu
 */
class Section_Nav_Walker extends Walker_Nav_Menu {
  
	/**
 	 * @see Walker_Nav_Menu::start_lvl()
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param int $depth Depth of page. Used for padding.
	*/
    function start_lvl( &$output, $depth = 0, $args = array() ) {
        $output .= '<div class="content" data-section-content><ul class="side-nav">';
    }	
	
	/**
	 * @see Walker::end_lvl()
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param int $depth Depth of page. Used for padding.
	 */
	function end_lvl( &$output, $depth = 0, $args = array() ) {
		// close .side-nav .content and .section
		$output .= '</ul></div></div>';
	}
	
    /**
     * @see Walker_Nav_Menu::start_el()
     *
     * @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 $args
     */
	function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
  
        $class_names = $value = '';
  
	$classes = empty( $item->classes ) ? array() : (array) $item->classes;
	$classes[] = 'menu-item-' . $item->ID;
	$classes[] = ( $depth == 0 ) ? 'title' : '';
	$classes[] = ( $args->has_children ) ? 'has-dropdown' : '';
	$classes[] = ( in_array('current-menu-item', $classes) && !in_array('active', $classes) ) ? 'active' : '';
		  
  
        $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
        $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 ) . '"' : '';
  		  
	// create sections
	//$section_class = ( $depth == 0 && in_array('active', $classes) ) ? 'section active' : 'section';
	$section_class = 'section';
	$output .= ( $depth == 0 ) ? '<div class="' . $section_class . '">' : '';
		  
	// if top level use p.title else use li in dropdown
        $output .= ( $depth == 0 ) ? '<p data-section-title' . $id . $value . $class_names .'>' : '<li' . $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 ) . '"' : '';
		  
	// if top level and has dropdown do not use url
	if ( $depth == 0 && $args->has_children ) {
		$attributes .= ' href="#"';
	}
	// else use url
	elseif ( !empty( $item->url ) ) {
		$attributes .= ' href="' . esc_attr( $item->url ) . '"';
	}
  		
        $item_output = $args->before;
        $item_output .= '<a'. $attributes .'>';
        $item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
        $item_output .= '</a>';
        $item_output .= $args->after;
		  
	// close .section if there is no dropdown
	$item_output .= ( $depth == 0 && !$args->has_children ) ? '</div>' : '';
  
        $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
      }

	/**
	 * @see Walker::end_el()
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param object $item Page data object. Not used.
	 * @param int $depth Depth of page. Not Used.
	 */
	function end_el( &$output, $item, $depth = 0, $args = array() ) {
		if ( $depth > 0 ) {
			$output .= "</li>";
		}
	}
 
    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]);
        }
	$element->classes[] = ($element->current || $element->current_item_ancestor) ? 'active' : '';

        parent::display_element($element, $children_elements, $max_depth, $depth, $args, $output);
    } 	  
	
}
?>

foundation4-section.php

<nav id="menu">
  <div class="section-container horizontal-nav" data-section="horizontal-nav">
    <?php foundation_section_menu(); ?>
  </div>
</nav>

This is so useful – how can I also include grandchildren of the parent item? Currently, it breaks (closes the list too early) the menu when there is more than one set of grandchildren.