How do I reset my menu so it closes all the sub-menu elements?

In a small window, mobile for example, I want to reset the menu when it's closed so all the sub-menu dropdowns close for example.

handleNavToggle: function() {
      $(".navbar-toggle").on("click", function() {
         if ($(this).hasClass("collapsed")) {
             openNavbar();
         } else {
             collapseNavbar();
         }
     });
},

function collapseNavbar() {
    $(".navbar-toggle").addClass("collapsed");
    $("#navbar").removeClass("in");
    $("#site-navigation").attr("style", [
        "height: 40px;",
        "background-color: transparent"
    ].join(" "));
    $("body").removeClass("noscroll");

    $(".fa-angle-up").hide();
    $(".navbar-toggle").animate({
        right: 0
    });
}