const togglerBtn = document.getElementById("btn-burger"); const navbarContent = document.getElementById("nt-mainmenu"); navbarContent.addEventListener("show.bs.collapse", () => { console.log("opening navbar content"); togglerBtn.classList.toggle("is-active"); }); navbarContent.addEventListener("hide.bs.collapse", () => { console.log("closing navbar content"); togglerBtn.classList.toggle("is-active"); });