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");

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

// Page navigation
document.querySelector(".nav__links").addEventListener("click", function (e) {
  if (e.target.classList.contains("nav__link")) {
    const id = e.target.getAttribute("href");
    document.querySelector(id).scrollIntoView({ behavior: "smooth" });
  }
});

// Tabbed component
tabsContainer.addEventListener("click", function (e) {
  const clicked = e.target.closest(".operations__tab");

  if (!clicked) return;

  tabs.forEach((t) => t.classList.remove("operations__tab--active"));
  tabsContent.forEach((c) => c.classList.remove("operations__content--active"));

  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 'argument' into handler
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);

// Reveal sections
const allSections = document.querySelectorAll(".section");

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

  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(function (section) {
  sectionObserver.observe(section);
});

// 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 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 currSlide = 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)}%)`)
    );
  };

  // Nex slide
  const nextSlide = function () {
    if (currSlide === maxSlide - 1) {
      currSlide = 0;
    } else {
      currSlide++;
    }

    goToSlide(currSlide);
    activateDot(currSlide);
  };

  // Prev slide
  const prevSlide = function () {
    if (currSlide === 0) {
      currSlide = maxSlide - 1;
    } else {
      currSlide--;
    }
    goToSlide(currSlide);
    activateDot(currSlide);
  };

  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();
    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);
    }
  });
};
slider();