add data role to using Walker_Nav_Menu

Hi all,

I was wondering if some one could help me with this.

I was trying to add the attribute data-role=”none” to the

class=”sub-menu” using Walker Class. However im stuck.

here is my html output…

<li id=”menu-item-132″ class=”menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-21 current_page_item menu-item-has-children menu-item-132″>About
<ul class=”sub-menu” style=”display: block;”>

and here is my custom walker class

class my_nav_walker extends Walker {
var $tree_type = array( ‘post_type’, ‘taxonomy’, ‘custom’ );
var $db_fields = array( ‘parent’ => ‘menu_item_parent’, ‘id’ => ‘db_id’ );
function start_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat(“\t”, $depth);
$output .= “\n$indent<ul class=\”sub-menu\”>\n”;
}

function end_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat(“\t”, $depth);
$output .= “$indent\n”;
}

function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
$indent = ( $depth ) ? str_repeat( “\t”, $depth ) : ”;
$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 ) );
$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->attr_title ) ? $item->attr_title : ”;
$atts[‘target’] = ! empty( $item->target ) ? $item->target : ”;
$atts[‘rel’] = ! empty( $item->xfn ) ? $item->xfn : ”;
$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;
$item_output .= ‘<a’. $attributes .’ data-role=”none”>’;
$item_output .= $args->link_before . apply_filters( ‘the_title’, $item->title, $item->ID ) . $args->link_after;
$item_output .= ”;
$item_output .= $args->after;
$output .= apply_filters( ‘walker_nav_menu_start_el’, $item_output, $item, $depth, $args );
}
function end_el( &$output, $item, $depth = 0, $args = array() ) {
$output .= “\n”;
}
}

?>

any help is appriciated