I am making my first custom walker to build an accordion menu. To start with I used this example: http://bitacre.com/2025/custom-nav-menu-walker-for-wordpress-themes
There are two functions. First start_lvl and then start_el.
In start_el the ID get's implemented by $item->ID. Does anybody know how I can do this in start_lvl as well? I need to give the (surrounding lower level navigation) an ID so I can trigger it to collapse in the accordion menu.
What I'm trying to generate is something like this:
<a href="#collapse2">Titel 2</a>
<ul id="collapse2">Lower Level Menu 2</ul>
<a href="#collapse3">Titel 3</a>
<ul id="collapse3">Lower Level Menu 3</ul>
My code for the start_lvl function:
// add id's and classes to ul sub-menus
function start_lvl( &$output, $depth, $item ) {
// depth dependent classes
$indent = ( $depth > 0 ? str_repeat( "\t", $depth ) : '' ); // code indent
$display_depth = ( $depth + 1); // because it counts the first submenu as 0
$pgid = ; // How to get ID in here??
$classes = array(
'sub-menu',
( $display_depth == 1 ? 'accordion-body collapse' : '' ),
( $display_depth % 2 ? 'menu-odd' : 'menu-even' ),
( $display_depth >=2 ? 'sub-sub-menu' : '' ),
'menu-depth-' . $display_depth
);
$ids = array(
'collapse' . $pgid
);
$class_names = implode( ' ', $classes );
$id_name = implode( ' ', $ids );
// build html
$output .= "\n" . $indent . '<ul id="' . $id_name . '" class="' . $class_names . '">' . "\n";
}