Responsive Image Slider

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CSS

*,
*::after,
*::before {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --active-color: hsl(204 100 53);
    --bg-color: #e1e3e5;
    --icon-default: hsl(203 5 75);
    --icon-accent: hsl(203 15 98);
    --navigation-color: hsl(203 5 25 / 0.3);
}

body {
    min-block-size: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--bg-color);
}

.image-slider {
    display: flex;
    flex-flow: column;
    width: clamp(360px, 96vw, 830px);
    aspect-ratio: 16 / 9;
    min-height: 300px;
    overflow: hidden;
    border-radius: 8px;
    container-type: inline-size;
    contain: content;
    background-color: #0006;
    box-shadow: rgba(0, 0, 0, 0.2) 0px 1px 2px, rgba(0, 0, 0, 0.3) 0px 2px 4px,
        rgba(0, 0, 0, 0.25) 0px 4px 8px, rgba(0, 0, 0, 0.2) 0px 8px 16px,
        rgba(0, 0, 0, 0.15) 0px 16px 32px;
}

.slider__content {
    flex-grow: 1;
    display: flex;
    justify-content: space-between;
}

.slider-control--button {
    border: 0;
    background: 0;
    outline: 0;
    cursor: pointer;
    place-content: center;
    padding-inline: 3vw;
    z-index: 1;
    display: grid;
}

.icon {
    height: 2rem;
    width: 2rem;
    fill: var(--icon-default);
    border-radius: 50%;
}

.slider-control--button:where(:hover) {
    background-image: linear-gradient(
        to var(--position),
        #0000 0%,
        #0002,
        80%,
        #0006 100%
    );
    .icon {
        fill: var(--icon-accent);
        background: #0001;
    }
}

.slider-control--button:active {
    outline: 0.2em solid hsl(204 100 53);
    outline-offset: -0.5em;
}

.prev-button {
    --position: left;
}
.next-button {
    --position: right;
}

.image-display {
    position: fixed;
    inset: 0;
}

.slider-navigation {
    z-index: 10;
    display: grid;
    grid-auto-flow: column;
    grid-template-columns: repeat(6, 1fr);
    grid-auto-columns: 100%;
    gap: 1.25rem;
    padding: 1rem;
    place-content: center;
    background-color: var(--navigation-color);
    backdrop-filter: blur(6px);
}

.nav-button {
    display: grid;
    width: 100%;
    height: 100%;
    border-radius: 0.5em;
    overflow: hidden;
    align-items: center;
    justify-content: center;
    border: 0;
    aspect-ratio: 16 / 9;
    transition: filter 150ms linear, scale 266ms ease;
}

.thumbnail {
    display: block;
    max-width: 100%;
    width: 100%;
    object-fit: cover;
    height: 100%;
}

.nav-button[aria-selected="true"] {
    scale: 1.1;
}

.nav-button[aria-selected="true"],
.nav-button:focus-visible {
    outline: 0.2em solid var(--active-color);
    outline-offset: 0.2em;
}

.nav-button[aria-selected="false"] {
    filter: opacity(0.7);
}

.nav-button[aria-selected="false"]:where(:hover, :focus-visible) {
    filter: opacity(1);
}

@container (max-width: 660px) {
    .nav-button:not(:has(img)) {
        background-color: rgb(241, 235, 232);
    }

.slider-navigation {
        display: flex;
        justify-content: center;
        padding-block: 1.5em;
    }

.nav-button {
        inline-size: 0.625rem;
        aspect-ratio: 1;
        border-radius: 50%;
    }

.nav-button > .thumbnail {
        display: none;
    }

.nav-button[aria-selected="true"] {
        background-color: black;
        scale: 1.5;
    }
}

JS

class Slider {
    constructor(slider) {
        this.slider = slider;
        this.display = slider.querySelector(".image-display");
        this.navButtons = Array.from(slider.querySelectorAll(".nav-button"));
        this.prevButton = slider.querySelector(".prev-button");
        this.nextButton = slider.querySelector(".next-button");
        this.sliderNavigation = slider.querySelector(".slider-navigation");
        this.currentSlideIndex = 0;
        this.preloadedImages = {};

this.initialize();
    }

initialize() {
        this.setupSlider();
        this.preloadImages();
        this.eventListeners();
    }

setupSlider() {
        this.showSlide(this.currentSlideIndex);
    }

showSlide(index) {
        this.currentSlideIndex = index;
        const navButtonImg = this.navButtons[
            this.currentSlideIndex
        ].querySelector("img");
        if (navButtonImg) {
            const imgClone = navButtonImg.cloneNode();
            this.display.replaceChildren(imgClone);
        }
        this.updateNavButtons();
    }

updateNavButtons() {
        this.navButtons.forEach((button, buttonIndex) => {
            const isSelected = buttonIndex === this.currentSlideIndex;
            button.setAttribute("aria-selected", isSelected);
            if (isSelected) button.focus();
        });
    }

preloadImages() {
        this.navButtons.forEach((button) => {
            const imgElement = button.querySelector("img");
            if (imgElement) {
                const imgSrc = imgElement.src;
                if (!this.preloadedImages[imgSrc]) {
                    this.preloadedImages[imgSrc] = new Image();
                    this.preloadedImages[imgSrc].src = imgSrc;
                }
            }
        });
    }

eventListeners() {
        document.addEventListener("keydown", (event) => {
            this.handleAction(event.key);
        });

this.sliderNavigation.addEventListener("click", (event) => {
            const targetButton = event.target.closest(".nav-button");
            const index = targetButton
                ? this.navButtons.indexOf(targetButton)
                : -1;
            if (index !== -1) {
                this.showSlide(index);
            }
        });

this.prevButton.addEventListener("click", () =>
            this.handleAction("prev")
        );
        this.nextButton.addEventListener("click", () =>
            this.handleAction("next")
        );
    }

handleAction(action) {
        if (action === "Home") {
            this.currentSlideIndex = 0;
        } else if (action === "End") {
            this.currentSlideIndex = this.navButtons.length - 1;
        } else if (action === "ArrowRight" || action === "next") {
            this.currentSlideIndex =
                (this.currentSlideIndex + 1) % this.navButtons.length;
        } else if (action === "ArrowLeft" || action === "prev") {
            this.currentSlideIndex =
                (this.currentSlideIndex - 1 + this.navButtons.length) %
                this.navButtons.length;
        }

this.showSlide(this.currentSlideIndex);
    }
}

const ImageSlider = new Slider(document.querySelector(".image-slider"));

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