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Nav Menu for Twitter Bootstrap

For use with Twitter Bootstrap, this snippet modifies the walker navigation to use the dropdown menu CSS and JavaScript. Insert this code into your functions.php, and be sure to include Bootstrap dropdown Javascript and CSS.

Code Snippet:

<?php

// Menu output mods
class description_walker extends Walker_Nav_Menu
{
      function start_el(&$output, $item, $depth, $args)
      {
			global $wp_query;
			$indent = ( $depth ) ? str_repeat( "t", $depth ) : '';
			
			$class_names = $value = '';
			
			// If the item has children, add the dropdown class for bootstrap
			if ( $args->has_children ) {
				$class_names = "dropdown ";
			}
			
			$classes = empty( $item->classes ) ? array() : (array) $item->classes;
			
			$class_names .= join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) );
			$class_names = ' 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        ) .'"' : '';
           	// if the item has children add these two attributes to the anchor tag
           	if ( $args->has_children ) {
				$attributes .= 'class="dropdown-toggle" data-toggle="dropdown"';
			}

            $item_output = $args->before;
            $item_output .= '<a'. $attributes .'>';
            $item_output .= $args->link_before .apply_filters( 'the_title', $item->title, $item->ID );
            $item_output .= $args->link_after;
            // if the item has children add the caret just before closing the anchor tag
            if ( $args->has_children ) {
            	$item_output .= '<b class="caret"></b></a>';
            }
            else{
            	$item_output .= '</a>';
            }
            $item_output .= $args->after;

            $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
            }
            
        function start_lvl(&$output, $depth) {
            $indent = str_repeat("t", $depth);
            $output .= "n$indent<ul class="dropdown-menu">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 );
      	    }
      	
            
}

?>

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