CSS Snap Scroll Slider

Minimal JS Carousel with CSS Snap Scroll

by ninty9notout

HTML

<link rel="stylesheet" href="https://unpkg.com/modern-css-reset/dist/reset.min.css">
<script src="https://fonts.googleapis.com/css2?family=Bree+Serif&amp;family=PT+Sans:ital,wght@0,400;0,700;1,400;1,700&amp;display=swap"></script>
<div class="section">
    <h2 class="section__heading">
        At Vero Eos et Accusamus
    </h2>

    <div class="heading__slider slider" data-controls>
        <div class="slider__list">
            <div class="slider__item">
                <a href="https://www.example.com" class="card">
                    <div class="card__media">
                        <img src="https://picsum.photos/640/360?1" alt="Et harum quidem rerum" class="card__image">
                    </div>

                    <div class="card__body">
                        <h3 class="card__title">
                            Et harum quidem rerum
                        </h3>

                        <p class="card__description">
                            At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium
                        </p>
                    </div>
                </a>
            </div>
            
            <div class="slider__item">
                <a href="https://www.example.com" class="card">
                    <div class="card__media">
                        <img src="https://picsum.photos/640/360?2" alt="Et harum quidem rerum" class="card__image">
                    </div>

                    <div class="card__body">
                        <h3 class="card__title">
                            Et harum quidem rerum
                        </h3>

                        <p class="card__description">
                            At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium
                        </p>
                    </div>
                </a>
            </div>
            
            <div class="slider__item">
                <a...

SCSS

html {
    font-family: 'PT Sans', sans-serif;
    font-size: 16px;
    line-height: 1rem;
}

body {
    background-color: #EAEAEA;
    color: #333333;
}

.section {
    padding: 20px;
}

.section__heading {
    font-family: 'Bree Serif', serif;
    font-size: 2.5rem;
    line-height: 1;
    margin-bottom: 10px;
    
    &::after {
        content: '';
        height: 5px;
        background-color: #333333;
        width: 20%;
        display: block;
        margin-top: 10px;
    }
}

.slider {
    overflow: hidden;
    margin-left: -20px;
    margin-right: -20px;
    position: relative;
}

.slider__list {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: scroll;
    scroll-snap-type: x mandatory;
    scroll-padding-left: 10px;
    
    @media (min-width: 1281px) {
        overflow-x: hidden;
        scroll-snap-type: initial;
        scroll-padding-left: initial;
    }

    &::before, &::after {
        content: '';
        display: block;
        min-width: 10px;
        height: 1px;
    }
}

.slider__item {
    padding: 10px;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    
    @media (min-width: 1281px) {
        scroll-snap-align: initial;
    }
}

.slider__controls {
    position: absolute;
    left: 0;
    top: 10px;
    right: 0;
    bottom: 10px;
    display: none;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
    opacity: .1;
    transition: opacity 250ms ease;
    
    @media (min-width: 1281px) {
        display: flex;
    }

    .slider:hover & {
        opacity: 1;
    }
}

.slider__control {
    all: unset;
    cursor: pointer;
    height: 100%;
    font-size: 10rem;
    padding-left: 2rem;
    padding-right: 2rem;
    pointer-events: all;
}

.slider__control--hidden {
    pointer-events: none;
    opacity: 0;
}

.slider__control--previous {
    background: linear-gradient(90deg, rgba(234, 234, 234, .75) 0%, rgba(234, 234, 234, 0) 100%);
}

.slider__control--next {
    background:...

JavaScript

(function () {
	const sliderSelector = '.slider';
    const sliderListSelector = '.slider__list';
    const sliderItemSelector = '.slider__item';
    const controlsSelector = '.slider__controls';
    const controlSelector = '.slider__control';

    const determineBoolean = value => {
    	if (String(value).toLowerCase() === 'true') {
        	return true;
        }
        
        if (Number(value) > 0 || Number(value) < 0) {
        	return true;
        }
        
        return false;
    }

    const determinePages = slider => {
        const totalSlides = slider.querySelectorAll(sliderItemSelector).length;
        const slideWidth = slider.querySelector(sliderItemSelector).offsetWidth;
        const trackWidth = slideWidth * totalSlides;
        const slidesPerPage = Math.floor(slider.offsetWidth / slideWidth);
        const pageWidth = slidesPerPage * slideWidth;
        const totalPages = Math.ceil(trackWidth / pageWidth);

        return [...Array(totalPages).keys()].map((page, index) => {
            return index * pageWidth;
        });
    }

    const generateControls = slider => {
    	const controls = document.createElement('div');
        controls.classList.add(controlsSelector.replace('.', ''));

        const previousButton = document.createElement('button');
        previousButton.classList.add(controlSelector.replace('.', ''));
        previousButton.classList.add(`${controlSelector.replace('.', '')}--previous`);
        previousButton.innerHTML = '&lsaquo;';

        const nextButton = document.createElement('button');
        nextButton.classList.add(controlSelector.replace('.', ''));
        nextButton.classList.add(`${controlSelector.replace('.', '')}--next`);
        nextButton.innerHTML = '&rsaquo;';

        controls.appendChild(previousButton);
        controls.appendChild(nextButton);
        slider.appendChild(controls);
        
        return { previousButton, nextButton };
    }

   ...