script.js

"use strict";

/**
 * add event listener on multiple elements
 */

const addEventOnElements = function (elements, eventType, callback) {
  for (let i = 0, len = elements.length; i < len; i++) {
    elements[i].addEventListener(eventType, callback);
  }
};

/**
 * MOBILE NAVBAR TOGGLE
 */

const navbar = document.querySelector("[data-navbar]");
const navTogglers = document.querySelectorAll("[data-nav-toggler]");
const overlay = document.querySelector("[data-overlay]");

const toggleNav = function () {
  navbar.classList.toggle("active");
  overlay.classList.toggle("active");
};

addEventOnElements(navTogglers, "click", toggleNav);

/**
 * active header when window scroll down to 100px
 */

const header = document.querySelector("[data-header]");

const headerActive = function () {
  if (window.scrollY > 100) {
    header.classList.add("active");
  } else {
    header.classList.remove("active");
  }
};

window.addEventListener("scroll", headerActive);