script.js

'use strict';

///////////////////////////////////////

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 nav = document.querySelector('.nav');
const tabs = document.querySelectorAll('.operations__tab');
const tabsContainer = document.querySelector('.operations__tab-container');
const tabsContent = document.querySelectorAll('.operations__content');

// modal window

const openModal = function () {
  modal.classList.remove('hidden');
  overlay.classList.remove('hidden');
};

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

for (let i = 0; i < btnsOpenModal.length; i++) {
  btnsOpenModal[i].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();
  if (e.target.classList.contains('nav__link')) {
    const id = e.target.getAttribute('href');
    document.querySelector(id).scrollIntoView({ behavior: 'smooth' });
  }
});

// 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;
  }
};

nav.addEventListener('mouseover', handleHover.bind(0.5));

nav.addEventListener('mouseout', handleHover.bind(1));

// Sticky navigation

const header = document.querySelector('.header');
const navHeight = nav.getBoundingClientRect().height;
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,
  rootMargin: `-${navHeight}px`,
});

headerObserver.observe(header);

// Tabed component

tabsContainer.addEventListener('click', e => {
  const clicked = e.target.closest('.operations__tab');

  // Guard clause
  if (!clicked) return;

  // Active tab
  tabs.forEach(t => t.classList.remove('operations__tab--active'));
  clicked.classList.add('operations__tab--active');

  // Activate content area
  tabsContent.forEach(tc => tc.classList.remove('operations__content--active'));
  document
    .querySelector(`.operations__content--${clicked.dataset.tab}`)
    .classList.add('operations__content--active');
});

//  Section load animation

const allSections = document.querySelectorAll('.section');
const revealSection = function (entries, observe) {
  const [entry] = entries;

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

const sectionObserver = new IntersectionObserver(revealSection, {
  root: null,
  threshold: 0.15,
});

allSections.forEach(function (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;

  if (!entry.isIntersecting) return;

  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

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

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

  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(${100 * (i - slide)}%)`)
    );
  };

  const nextSlide = function () {
    if (currentSlide === maxSlide - 1) {
      currentSlide = 0;
    } else {
      currentSlide++;
    }
    goToSlide(currentSlide);
    activateDot(currentSlide);
  };

  const prevSlide = function () {
    if (currentSlide === 0) {
      currentSlide = maxSlide - 1;
    } else {
      currentSlide--;
    }
    goToSlide(currentSlide);
    activateDot(currentSlide);
  };

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

  init();

  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;
      goToSlide(slide);
      activateDot(slide);
    }
  });
};

sliders();