I would like to use wp_nav_menu to generate side menu containing only elements that are children of currently selected top level element, or if a child element is selected, display also all element of top leve lelement.
To make it graphical -> top menu will show only 1 level elements:
Menu item 1
Menu item 2
Menu item 3
Menu item 4
Structure of entire menu looks this way:
Menu item 1
Submenu item A
Submenu item B
Menu item 2
Submenu item C
Submenu item D
Submenu item E
Menu item 3
Submenu item F
Submenu item G
Submenu item H
Menu item 4
Now if current page is one of: Menu item 1, Submenu item A, Submenu item B – side menu shows:
Submenu item A
Submenu item B
If current page is one of: Menu item 2, Submenu item C, Submenu item D, Submenu item E – side menu shows:
Submenu item C
Submenu item D
Submenu item E
If current page is Menu item 4, side menu is empty.
