JavaScript51/18-Background_Slider/script.js at main · anshulontech/JavaScript51 · GitHub

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const body = document.body;
const slides = document.querySelectorAll(`.slide`);
const leftBtn = document.getElementById(`left`);
const rightBtn = document.getElementById(`right`);

let activeSlide = 0;

setBgToBody();

rightBtn.addEventListener(`click`, () => {
    activeSlide++;

    if (activeSlide >= slides.length)
        activeSlide = 0;

    setBgToBody();
    setActiveSlide();
})

leftBtn.addEventListener(`click`, () => {
    activeSlide--;

    if (activeSlide < 0)
        activeSlide = slides.length - 1;

    setBgToBody();
    setActiveSlide();
})

function setBgToBody() {
    body.style.backgroundImage = slides[activeSlide].style.backgroundImage
}

function setActiveSlide() {
    slides.forEach((slide) => {
        slide.classList.remove(`active`);
    })

    slides[activeSlide].classList.add(`active`);
}