Hi nilsgoe,
I normally do post answers to my own questions and if I’m honest as I had no help from this post, I forgot I asked for help here.
I came up with a solution that worked for me.
I created a function (place this in your functions file see this for more info https://goo.gl/djqk )
class data_type_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;
$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 ) .'"' : '';
$prepend = '';
$append = '';
if($depth != 0)
{
$description = $append = $prepend = "";
}
$item_output = $args->before;
$item_output .= '<a'. $attributes .' data-role="" data-transition="" data-icon="">';
$item_output .= $args->link_before .$prepend.apply_filters( 'the_title', $item->title, $item->ID ).$append;
$item_output .= $description.$args->link_after;
$item_output .= '</a>';
$item_output .= $args->after;
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
}
This adds data-type, data-transition & data-icon, you could add anything you need to it. this then adds these to the links.
Then I used jQuery .attr to add what I need to those on a “page” basis, when needed like this…
$("#menu-mobile-nav a").attr("data-role","button");
$("#menu-mobile-nav a").attr("data-transition","flip");
$("#menu-mobile-nav a").attr("data-icon","arrow-r");
Hope it helps ??