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 (e) {
  e.preventDefault();
  modal.classList.remove('hidden');
  overlay.classList.remove('hidden');
};

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();
  }
});

///////////////////////////////////////
// BUTON SCROLL

btnScrollTo.addEventListener('click', function (e) {
  const s1coords = section1.getBoundingClientRect();

  // scrolling
  // window.scrollTo(
  //   s1coords.left + window.pageYOffset,
  //   s1coords.top + window.pageYOffset
  // );

  // window.scrollTo({
  //   left: s1coords.left + window.pageXOffset,
  //   top: s1coords.top + window.pageYOffset,
  //   behavior: 'smooth',
  //     });

  section1.scrollIntoView({ behavior: 'smooth' });
});

///////////////////
// PAGE NAVIGATION

document.querySelector('.nav__links').addEventListener('click', function (e) {
  e.preventDefault();

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

///////////////////////////////////////
// TABBED CONTENT

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

  // Guard clause
  if (!clicked) return;

  // Remove active classes
  tabs.forEach(t => t.classList.remove('operations__tab--active'));
  tabsContent.forEach(c => c.classList.remove('operations__content--active'));

  // Activate tab
  clicked.classList.add('operations__tab--active');

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

///////////////////////////////////////
// MANU FADE ANIMATION

// Refactored
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 'argument' into handler
// mouse over bubbles, mouseenter niet
nav.addEventListener('mouseover', handleHover.bind(0.5));
nav.addEventListener('mouseout', handleHover.bind(1));

///////////////////////////////////////
// STICKY NAVIGATION

// VIA SCROLL EVENT
// const initialCoords = section1.getBoundingClientRect();

// window.addEventListener('scroll', function () {
//   if (window.scrollY > initialCoords.top) nav.classList.add('sticky');
//   else nav.classList.remove('sticky');
// });

// VIA INTERSECTION OBSERVER API

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);

// REVEAL ELEMENTS ON SCROLL
const allSections = document.querySelectorAll('.section');

const revealSection = function (entries, observer) {
  const [entry] = entries;

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

  // Unobserve
  observer.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

// All images with the data-src images are goning to be selected
const imgTargets = document.querySelectorAll('img[data-src]');

const loadImg = function (entries, observer) {
  const [entry] = entries;

  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 animation

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

  // 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(${100 * (i - slide)}%)`)
    );
    // curSlide = 1: -100%, 0%, 100%, 200%
  };

  // Go to next slide -> change % to slide you want to move to to 0 %
  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 () {
    goToSlide(0);
    createDots();
    activateDot(0);
  };

  init();

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

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

    //shortcirquiting
    e.key === 'ArrowRight' && nextSlide();
  });

  // Eventdelegation (adding a handler to parentelement of the needed child elements)
  dotContainer.addEventListener('click', function (e) {
    if (e.target.classList.contains('dots__dot')) {
      // restructuring, reading from the object
      const { slide } = e.target.dataset;
      goToSlide(slide);
      activateDot(slide);
    }
  });
};
slider();

/*

// REFERENCE CLASSES

///////////////////
// Selecting, Creating, and Deleting Elements

// Selecting elements
console.log(document.documentElement);
console.log(document.head);
console.log(document.body);

const header = document.querySelector('.header');
const allSections = document.querySelectorAll('.section');
console.log(allSections);

document.getElementById('section--1');
const allButtons = document.getElementsByTagName('button');
console.log(allButtons);

console.log(document.getElementsByClassName('btn'));

// Creating and inserting elements
const message = document.createElement('div');
message.classList.add('cookie-message');
// message.textContent = 'We use cookied for improved functionality and analytics.';
message.innerHTML =
  'We use cookied for improved functionality and analytics. <button class="btn btn--close-cookie">Got it!</button>';

// header.prepend(message);
header.append(message);
// header.append(message.cloneNode(true));

// header.before(message);
// header.after(message);

// Delete elements
document
  .querySelector('.btn--close-cookie')
  .addEventListener('click', function () {
    // message.remove();
    message.parentElement.removeChild(message);
  });


  */
/*




///////////////////////////////////////
// Styles, Attributes and Classes

// Styles
message.style.backgroundColor = '#37383d';
message.style.width = '120%';

console.log(message.style.color);
console.log(message.style.backgroundColor);

console.log(getComputedStyle(message).color);
console.log(getComputedStyle(message).height);

message.style.height =
  Number.parseFloat(getComputedStyle(message).height, 10) + 30 + 'px';

// CSS VARIABLES VERANDEREN

document.documentElement.style.setProperty('--color-primary', 'orangered');

// ATTRIBUTES
const logo = document.querySelector('.nav__logo');
console.log(logo.alt);
console.log(logo.src);

logo.alt = 'beautifull minimalist logo';

console.log(logo.getAttribute('src'));
console.log(link.getAttribute('href'));

// Data attributes

console.log(logo.dataset.versionNumber);

logo.classList.add();
logo.classList.remove();
logo.classList.toggle();
logo.classList.contains();

*/
///////////////////////////////////////
/*

// SMOOTH SCROLL

const btnScrollTo = document.querySelector('.btn--scroll-to');
const section1 = document.querySelector('#section--1');

// Manier 1

btnScrollTo.addEventListener('click', function (e) {
  const s1coords = section1.getBoundingClientRect();
  console.log(s1coords);

  // scrolling
  // window.scrollTo(
  //   s1coords.left + window.pageYOffset,
  //   s1coords.top + window.pageYOffset
  // );

  // window.scrollTo({
  //   left: s1coords.left + window.pageXOffset,
  //   top: s1coords.top + window.pageYOffset,
  //   behavior: 'smooth',
  //     });

  section1.scrollIntoView({ behavior: 'smooth' });
});


*/
///////////////////////////////////////
// TYPES OF EVENTS AND EVENT HANDLERS
/*

const h1 = document.querySelector('h1');

const alertH1 = function (e) {
  alert('addEventListener: Great! You are reading the heading : D');

  h1.removeEventListener('mouseenter', alertH1);
};

h1.addEventListener('mouseenter', alertH1);

setTimeout(() => h1.removeEventListener('mouseenter', alertH1), 3000);

// h1.onmouseenter = function (e) {
//   alert('addEventListener: Great! You are reading the heading : D');
// };

*/

///////////////////////////////////////
// EVENT PROPAGATION

/*

// rgb(255, 255, 255)
const randomInt = (min, max) =>
  Math.floor(Math.random() * (max - min + 1) + min);
const randomColor = () =>
  `rgb(${randomInt(0, 255)}, ${randomInt(0, 255)}, ${randomInt(0, 255)})`;

document.querySelector('.nav__link').addEventListener('click', function (e) {
  this.style.backgroundColor = randomColor();
  console.log('LINK', e.target, e.currentTarget);

  e.stopPropagation();
});

document.querySelector('.nav__links').addEventListener('click', function (e) {
  this.style.backgroundColor = randomColor();
  console.log('CONTAINER', e.target, e.currentTarget);
});

document.querySelector('.nav').addEventListener('click', function (e) {
  this.style.backgroundColor = randomColor();
  console.log('NAV', e.target, e.currentTarget);
});

*/
/*

///////////////////////////////////////
// DOM TRAVERSING



const h1 = document.querySelector('h1');

// Going downwards: child
// querySelector gaat zo diep als de kinderen zijn
// Met querySleector pak je niet andere elementen met de zlefde class, maar met een andere parent.
// ChildNodes geeft van alles.
console.log(h1.querySelectorAll('.highlight'));
console.log(h1.childNodes);

// Werkt alleen met directe children
console.log(h1.children);

h1.firstElementChild.style.color = 'white';
h1.lastElementChild.style.color = 'orangered';

// Going upwards: parents
console.log(h1.parentNode);
console.log(h1.parentElement);

// Soms hebben we een parent element nodig, hoever die ook is in de DOM tree. Met closest gebruik je een query string).

// Deze gebruik je veel! Vooral met eventDelegation

// Closest is eigenlijk het tegenovergestelde als queryselector. beide geebruiken een query string als input. Queryselector pakt alle childs van een parent. Closest pakt alle parents.

h1.closest('.header').style.background = 'var(--gradient-secondary)';

h1.closest('h1').style.background = 'var(--gradient-secondary)';

// Selecting sibling
// We kunnen alleen direct siblings bereiken in javascript.
// Dat zijn de previous en next siblings.

console.log(h1.previousElementSibling);
console.log(h1.nextElementSibling);

// Dit heb je ook voor nodes

console.log(h1.previousSibling);
console.log(h1.nextSibling);

// Als je wel alle nodes wil, kan je gebruik maken van parentElement en dan children.

console.log(h1.parentElement.children);

[...h1.parentElement.children].forEach(function (el) {
  if (el !== h1) el.style.transform = 'scale(0.5)';
});

*/

/*
///////////////////////////////////////
// INTERSECTION OBSERVER API
const obsCallback = function (entries, observer) {
  entries.forEach(entry => {
    console.log(entry);
  });
};

const obsOptions = {
  root: null,
  threshold: [0, 0.2],
};

const observer = new IntersectionObserver(obsCallback, obsOptions);

// section is the target here
observer.observe(section1);

*/

/*
///////////////////////////////////////
// Lifecycle DOM Events

// DOM content Loaded
document.addEventListener('DOMContentLoaded', function (e) {});

// Load event 
window.addEventListener(‘load’, function(e){
})

// Before unload
window.addEventListener('beforeunload', function(e){
  e.preventDefault();

})

*/