administraCursos/resources/js/app.js

const mdc = require('material-components-web');
mdc.autoInit();

$("ul.dropdown-menu [data-toggle='dropdown']").on("click", function(event) {
    event.preventDefault();
    event.stopPropagation();

    $(this).siblings().toggleClass("show");

    if (!$(this).next().hasClass('show')) {
        $(this).parents('.dropdown-menu').first().find('.show').removeClass("show");
    }
    $(this).parents('li.nav-item.dropdown.show').on('hidden.bs.dropdown', function(e) {
        $('.dropdown-submenu .show').removeClass("show");
    });
});