Untitled

'use strict';

const nav = document.querySelector('.nav');
const modal = document.querySelector('.modal');
const overlay = document.querySelector('.overlay');
const btnCloseModal = document.querySelector('.btn--close-modal');
const btnsOpenModal = document.querySelectorAll('.btn--show-modal');
const btnScrollTo = document.querySelector('.btn--scroll-to');
const section1 = document.querySelector('#section--1');
const tabs = document.querySelectorAll('.operations__tab');
const tabsContainer = document.querySelector('.operations__tab-container');
const tabsContent = document.querySelectorAll('.operations__content');
const header = document.querySelector('.header');

///////////////////////////////////////
// Modal window

const openModal = function (e) {
  e.preventDefault(); // to prevent the website from going back to the top when opening the modal
  modal.classList.remove('hidden');
  overlay.classList.remove('hidden');

  e.stopPropagation();
};

const closeModal = function () {
  modal.classList.add('hidden');
  overlay.classList.add('hidden');
};

btnsOpenModal.forEach((btn) => btn.addEventListener('click', openModal));

btnCloseModal.addEventListener('click', closeModal);
overlay.addEventListener('click', closeModal);

document.addEventListener('keydown', function (e) {
  if (e.key === 'Escape' && !modal.classList.contains('hidden')) {
    closeModal();
  }
});

///////////////////////////////////////
// Button scrolling

btnScrollTo.addEventListener('click', function (e) {
  section1.scrollIntoView({ behavior: 'smooth' });
});

///////////////////////////////////////
// Page navigation

document.querySelector('.nav__links').addEventListener('click', function (e) {
  e.preventDefault();
  // console.log(e.target);

  // Matching strategy
  if (e.target.classList.contains('nav__link')) {
    const id = e.target.getAttribute('href');
    console.log(id);
    document.querySelector(id).scrollIntoView({ behavior: 'smooth' });
  }
});

///////////////////////////////////////
// Tabbed component

tabsContainer.addEventListener('click', function (e) {
  const clicked = e.target.closest('.operations__tab');
  // console.log(clicked);

  // Guard clause
  if (!clicked) return;

  // remove all active classes from tab and content area
  tabs.forEach((tab) => tab.classList.remove('operations__tab--active'));
  tabsContent.forEach((tabContent) =>
    tabContent.classList.remove('operations__content--active')
  );

  // activate tab and content area
  clicked.classList.add('operations__tab--active');
  document
    .querySelector(`.operations__content--${clicked.dataset.tab}`)
    .classList.add('operations__content--active');
});

///////////////////////////////////////
// menu fade animation
const handleHover = function (e) {
  if (e.target.classList.contains('nav__link')) {
    const link = e.target;
    const siblings = link.closest('.nav').querySelectorAll('.nav__link');
    const logo = link.closest('.nav').querySelector('img');

    siblings.forEach((el) => {
      if (el !== link) el.style.opacity = this;
    });
    logo.style.opacity = this;
  }
};

// passing an argument into handler
// * mouseenter/mouseleave does not bubble
nav.addEventListener('mouseover', handleHover.bind(0.5));
nav.addEventListener('mouseout', handleHover.bind(1));

///////////////////////////////////////
// Sticky navigation - scroll event

const navHeight = nav.getBoundingClientRect().height;
// console.log(navHeight);

const stickyNav = function (entries) {
  const [entry] = entries;
  if (!entry.isIntersecting) nav.classList.add('sticky');
  else nav.classList.remove('sticky');
};

const headerObserver = new IntersectionObserver(stickyNav, {
  root: null,
  threshold: 0, // 0 percent of the header is visible, we want something to happen
  rootMargin: `-${navHeight}px`, // px height of nav
});
headerObserver.observe(header);

///////////////////////////////////////
// Reveal elements

const allSections = document.querySelectorAll('.section');

const revealSection = function (entries, observer) {
  const [entry] = entries;
  // console.log(entry);

  if (!entry.isIntersecting) return;
  entry.target.classList.remove('section--hidden');

  observer.unobserve(entry.target);
};

const sectionObserver = new IntersectionObserver(revealSection, {
  root: null,
  threshold: 0.15,
});
allSections.forEach((section) => {
  sectionObserver.observe(section);
  section.classList.add('section--hidden');
});

///////////////////////////////////////
// Lazy loading images

const imgTargets = document.querySelectorAll('img[data-src]');

const loadImg = function (entries, observer) {
  const [entry] = entries;
  // console.log(entry);

  if (!entry.isIntersecting) return;

  // replace src with data-src
  entry.target.src = entry.target.dataset.src;

  entry.target.addEventListener('load', function () {
    entry.target.classList.remove('lazy-img');
  });

  observer.unobserve(entry.target);
};

const imgObserver = new IntersectionObserver(loadImg, {
  root: null,
  threshold: 0,
  rootMargin: '200px',
});

imgTargets.forEach((img) => {
  imgObserver.observe(img);
});

///////////////////////////////////////
// Slider part 1

const slider = function () {
  const slides = document.querySelectorAll('.slide');
  const slider = document.querySelector('.slider');
  const btnLeft = document.querySelector('.slider__btn--left');
  const btnRight = document.querySelector('.slider__btn--right');
  const dotContainer = document.querySelector('.dots');

  // slider.style.transform = 'scale(0.4) translateX(-800px)';
  // slider.style.overflow = 'visible';

  // slides.forEach((slide, i) => {
  //   slide.style.transform = `translateX(${i * 100}%)`; // 0%, 100%, 200%, 300%
  // });

  // functions
  const createDots = function () {
    slides.forEach(function (_, i) {
      dotContainer.insertAdjacentHTML(
        'beforeend',
        `<button class="dots__dot" data-slide="${i}"></button>`
      );
    });
  };

  const activateDot = function (slide) {
    document
      .querySelectorAll('.dots__dot')
      .forEach((dot) => dot.classList.remove('dots__dot--active'));

    document
      .querySelector(`.dots__dot[data-slide="${slide}"]`)
      .classList.add('dots__dot--active');
  };

  const goToSlide = function (slide) {
    slides.forEach((s, i) => {
      s.style.transform = `translateX(${(i - slide) * 100}%)`; // slide 1: -100%, 0%, 100%, 200%
    });
  };

  let curSlide = 0;
  const maxSlide = slides.length;

  // Next slide and prev slide
  const nextSlide = function () {
    if (curSlide === maxSlide - 1) curSlide = 0;
    else curSlide++;

    goToSlide(curSlide);
    activateDot(curSlide);
  };

  const prevSlide = function () {
    if (curSlide === 0) curSlide = maxSlide - 1;
    else curSlide--;

    goToSlide(curSlide);
    activateDot(curSlide);
  };

  const init = function () {
    createDots();
    activateDot(0);
    goToSlide(0);
  };

  init();

  // Event handlers
  btnRight.addEventListener('click', nextSlide);
  btnLeft.addEventListener('click', prevSlide);

  document.addEventListener('keydown', function (e) {
    if (e.key === 'ArrowLeft') prevSlide();
    e.key === 'ArrowRight' && nextSlide();
  });

  dotContainer.addEventListener('click', function (e) {
    if (e.target.classList.contains('dots__dot')) {
      const { slide } = e.target.dataset; // same as const slide = e.target.dataset.slide
      goToSlide(slide);
      activateDot(slide);
    }
  });
};

slider();