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

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

Parameters

event

This is the jQuery.Event object.

item

The wijmenu widget object when a menu is hidden or a wijmenuitem object when the submenu is hidden.

Reference

options type
wijmenu jQuery Widget