$(function () {
    // Set hidding event handler function
    $(".selector").wijmenu({
        hidding : function (event, item) {
     
        }
    });
});

hidding = function ( 
   event : any,
   item : any
) { };

Parameters

event

This is the jQuery.Event object.

item

This is the wijmenu widget object when hiding the menu or a wijmenuitem when hiding the submenu.

Reference

options type
wijmenu jQuery Widget