TikTok Tutorial #85 - How to create a JS Photo slider

Learn with us how to create an awesome photo slider with Javascript!

If you found us on TikTok on the following post, check out this article and copy-paste the full code!

Happy coding! 😻

@creative.tim Code smarter, not harder. Check the link in bio How to #85 full code🚀 #webdev #programmer #coding #howto #tutorial #code #photoslider ♬ Better Together - The Jilettes

Contents:
1. HTML Code
2. CSS Code
3. Javascript Code

Get your code ⬇️

1. HTML Code

<div class="app">

	<div class="cardList">
		<button class="cardList__btn btn btn--left">
			<div class="icon">
				<svg>
					<use xlink:href="#arrow-left"></use>
				</svg>
			</div>
		</button>

		<div class="cards__wrapper">
			<div class="card current--card">
				<div class="card__image">
					<img src="https://source.unsplash.com/Z8dtTatMVMw" alt="" />
				</div>
			</div>

			<div class="card next--card">
				<div class="card__image">
					<img src="https://source.unsplash.com/9dmycbFE7mQ" alt="" />
				</div>
			</div>

			<div class="card previous--card">
				<div class="card__image">
					<img src="https://source.unsplash.com/m7K4KzL5aQ8" alt="" />
				</div>
			</div>
		</div>

		<button class="cardList__btn btn btn--right">
			<div class="icon">
				<svg>
					<use xlink:href="#arrow-right"></use>
				</svg>
			</div>
		</button>
	</div>

	<div class="infoList">
		<div class="info__wrapper">
			<div class="info current--info">
				<h1 class="text name">Highlands</h1>
				<h4 class="text location">Scotland</h4>
				<p class="text description">The mountains are calling</p>
			</div>

			<div class="info next--info">
				<h1 class="text name">Machu Pichu</h1>
				<h4 class="text location">Peru</h4>
				<p class="text description">Adventure is never far away</p>
			</div>

			<div class="info previous--info">
				<h1 class="text name">Chamonix</h1>
				<h4 class="text location">France</h4>
				<p class="text description">Let your dreams come true</p>
			</div>
		</div>
	</div>


	<div class="app__bg">
		<div class="app__bg__image current--image">
			<img src="https://source.unsplash.com/Z8dtTatMVMw" alt="" />
		</div>
		<div class="app__bg__image next--image">
			<img src="https://source.unsplash.com/9dmycbFE7mQ" alt="" />
		</div>
		<div class="app__bg__image previous--image">
			<img src="https://source.unsplash.com/m7K4KzL5aQ8" alt="" />
		</div>
	</div>
</div>

<div class="loading__wrapper">
	<div class="loader--text">Loading...</div>
	<div class="loader">
		<span></span>
	</div>
</div>


<svg class="icons" style="display: none;">
	<symbol id="arrow-left" xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'>
		<polyline points='328 112 184 256 328 400'
					 style='fill:none;stroke:#fff;stroke-linecap:round;stroke-linejoin:round;stroke-width:48px' />
	</symbol>
	<symbol id="arrow-right" xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'>
		<polyline points='184 112 328 256 184 400'
					 style='fill:none;stroke:#fff;stroke-linecap:round;stroke-linejoin:round;stroke-width:48px' />
	</symbol>
</svg>


<div class="support">
	<a href="https://twitter.com/DevLoop01" target="_blank"><i class="fab fa-twitter-square"></i></a>
	<a href="https://dribbble.com/devloop01" target="_blank"><i class="fab fa-dribbble"></i></a>
</div>

2. CSS Code

@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@500;600;700;800&display=swap");
:root {
	--card-width: 200px;
	--card-height: 300px;

	--card-transition-duration: 800ms;
	--card-transition-easing: ease;
}

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

body {
	width: 100%;
	height: 100vh;
	display: flex;
	justify-content: center;
	align-items: center;
	background: rgba(0, 0, 0, 0.787);
	overflow: hidden;
}

button {
	border: none;
	background: none;
	cursor: pointer;
	&:focus {
		outline: none;
		border: none;
	}
}

.app {
	position: relative;
	width: 100%;
	height: 100%;
	display: flex;
	justify-content: center;
	align-items: center;

	&__bg {
		position: absolute;
		width: 100%;
		height: 100%;
		z-index: -5;
		filter: blur(8px);
		pointer-events: none;
		user-select: none;
		overflow: hidden;

		&::before {
			content: "";
			position: absolute;
			left: 0;
			top: 0;
			width: 100%;
			height: 100%;
			background: #000;
			z-index: 1;
			opacity: 0.8;
		}

		&__image {
			position: absolute;
			left: 50%;
			top: 50%;
			transform: translate(-50%, -50%) translateX(var(--image-translate-offset, 0));
			width: 180%;
			height: 180%;
			transition: transform 1000ms ease, opacity 1000ms ease;
			overflow: hidden;

			img {
				width: 100%;
				height: 100%;
				object-fit: cover;
			}
			&.current--image {
				opacity: 1;
				--image-translate-offset: 0;
			}
			&.previous--image,
			&.next--image {
				opacity: 0;
			}
			&.previous--image {
				--image-translate-offset: -25%;
			}
			&.next--image {
				--image-translate-offset: 25%;
			}
		}
	}
}

.cardList {
	position: absolute;
	width: calc(3 * var(--card-width));
	height: auto;

	&__btn {
		--btn-size: 35px;
		width: var(--btn-size);
		height: var(--btn-size);
		position: absolute;
		top: 50%;
		transform: translateY(-50%);
		z-index: 100;

		&.btn--left {
			left: -5%;
		}
		&.btn--right {
			right: -5%;
		}

		.icon {
			width: 100%;
			height: 100%;
			svg {
				width: 100%;
				height: 100%;
			}
		}
	}

	.cards__wrapper {
		position: relative;
		width: 100%;
		height: 100%;
		perspective: 1000px;
	}
}

.card {
	--card-translateY-offset: 100vh;

	position: absolute;
	left: 50%;
	top: 50%;
	transform: translate(-50%, -50%) translateX(var(--card-translateX-offset))
		translateY(var(--card-translateY-offset)) rotateY(var(--card-rotation-offset))
		scale(var(--card-scale-offset));
	display: inline-block;
	width: var(--card-width);
	height: var(--card-height);
	transition: transform var(--card-transition-duration)
		var(--card-transition-easing);
	user-select: none;

	&::before {
		content: "";
		position: absolute;
		left: 0;
		top: 0;
		width: 100%;
		height: 100%;
		background: #000;
		z-index: 1;
		transition: opacity var(--card-transition-duration)
			var(--card-transition-easing);
		opacity: calc(1 - var(--opacity));
	}

	&__image {
		position: relative;
		width: 100%;
		height: 100%;
		img {
			position: absolute;
			left: 0;
			top: 0;
			width: 100%;
			height: 100%;
			object-fit: cover;
		}
	}

	&.current--card {
		--current-card-rotation-offset: 0;
		--card-translateX-offset: 0;
		--card-rotation-offset: var(--current-card-rotation-offset);
		--card-scale-offset: 1.2;
		--opacity: 0.8;
	}

	&.previous--card {
		--card-translateX-offset: calc(-1 * var(--card-width) * 1.1);
		--card-rotation-offset: 25deg;
	}

	&.next--card {
		--card-translateX-offset: calc(var(--card-width) * 1.1);
		--card-rotation-offset: -25deg;
	}

	&.previous--card,
	&.next--card {
		--card-scale-offset: 0.9;
		--opacity: 0.4;
	}
}

.infoList {
	position: absolute;
	width: calc(3 * var(--card-width));
	height: var(--card-height);
	pointer-events: none;

	.info__wrapper {
		position: relative;
		width: 100%;
		height: 100%;
		display: flex;
		justify-content: flex-start;
		align-items: flex-end;
	perspective: 1000px;
	transform-style: preserve-3d;
	}
}

.info {
	margin-bottom: calc(var(--card-height) / 8);
	margin-left: calc(var(--card-width) / 1.5);
	transform: translateZ(2rem);
	transition: transform var(--card-transition-duration)
		var(--card-transition-easing);
	.text {
		position: relative;
		font-family: "Montserrat";
		font-size: calc(var(--card-width) * var(--text-size-offset, 0.2));
		white-space: nowrap;
		color: #fff;
		width: fit-content;
	}

	.name,
	.location {
		text-transform: uppercase;
	}

	.location {
		font-weight: 800;
	}

	.location {
		--mg-left: 40px;
		--text-size-offset: 0.12;
		font-weight: 600;
		margin-left: var(--mg-left);
		margin-bottom: calc(var(--mg-left) / 2);
		padding-bottom: 0.8rem;
		&::before,
		&::after {
			content: "";
			position: absolute;
			background: #fff;
			left: 0%;
			transform: translate(calc(-1 * var(--mg-left)), -50%);
		}
		&::before {
			top: 50%;
			width: 20px;
			height: 5px;
		}
		&::after {
			bottom: 0;
			width: 60px;
			height: 2px;
		}
	}

	.description {
		--text-size-offset: 0.065;
		font-weight: 500;
	}

	&.current--info {
		opacity: 1;
		display: block;
	}
	&.previous--info,
	&.next--info {
		opacity: 0;
		display: none;
	}
}

.loading__wrapper {
	position: fixed;
	left: 0;
	top: 0;
	width: 100%;
	height: 100%;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	background: #000;
	z-index: 200;
	.loader--text {
		color: #fff;
		font-family: "Montserrat";
		font-weight: 500;
		margin-bottom: 1.4rem;
	}
	.loader {
		position: relative;
		width: 200px;
		height: 2px;
		background: rgba(255, 255, 255, 0.25);
		span {
			position: absolute;
			left: 0;
			top: 0;
			width: 100%;
			height: 100%;
			background: rgb(255, 0, 0);
			transform: scaleX(0);
			transform-origin: left;
		}
	}
}

@media only screen and (min-width: 800px) {
	:root {
		--card-width: 250px;
		--card-height: 400px;
	}
}

.support {
	position: absolute;
	right: 10px;
	bottom: 10px;
	padding: 10px;
	display: flex;
	a {
		margin: 0 10px;
		color: #fff;
		font-size: 1.8rem;
		backface-visibility: hidden;
		transition: all 150ms ease;
		&:hover {
			transform: scale(1.1);
		}
	}
}

3. Javascript Code

console.clear();

const { gsap, imagesLoaded } = window;

const buttons = {
	prev: document.querySelector(".btn--left"),
	next: document.querySelector(".btn--right"),
};
const cardsContainerEl = document.querySelector(".cards__wrapper");
const appBgContainerEl = document.querySelector(".app__bg");

const cardInfosContainerEl = document.querySelector(".info__wrapper");

buttons.next.addEventListener("click", () => swapCards("right"));

buttons.prev.addEventListener("click", () => swapCards("left"));

function swapCards(direction) {
	const currentCardEl = cardsContainerEl.querySelector(".current--card");
	const previousCardEl = cardsContainerEl.querySelector(".previous--card");
	const nextCardEl = cardsContainerEl.querySelector(".next--card");

	const currentBgImageEl = appBgContainerEl.querySelector(".current--image");
	const previousBgImageEl = appBgContainerEl.querySelector(".previous--image");
	const nextBgImageEl = appBgContainerEl.querySelector(".next--image");

	changeInfo(direction);
	swapCardsClass();

	removeCardEvents(currentCardEl);

	function swapCardsClass() {
		currentCardEl.classList.remove("current--card");
		previousCardEl.classList.remove("previous--card");
		nextCardEl.classList.remove("next--card");

		currentBgImageEl.classList.remove("current--image");
		previousBgImageEl.classList.remove("previous--image");
		nextBgImageEl.classList.remove("next--image");

		currentCardEl.style.zIndex = "50";
		currentBgImageEl.style.zIndex = "-2";

		if (direction === "right") {
			previousCardEl.style.zIndex = "20";
			nextCardEl.style.zIndex = "30";

			nextBgImageEl.style.zIndex = "-1";

			currentCardEl.classList.add("previous--card");
			previousCardEl.classList.add("next--card");
			nextCardEl.classList.add("current--card");

			currentBgImageEl.classList.add("previous--image");
			previousBgImageEl.classList.add("next--image");
			nextBgImageEl.classList.add("current--image");
		} else if (direction === "left") {
			previousCardEl.style.zIndex = "30";
			nextCardEl.style.zIndex = "20";

			previousBgImageEl.style.zIndex = "-1";

			currentCardEl.classList.add("next--card");
			previousCardEl.classList.add("current--card");
			nextCardEl.classList.add("previous--card");

			currentBgImageEl.classList.add("next--image");
			previousBgImageEl.classList.add("current--image");
			nextBgImageEl.classList.add("previous--image");
		}
	}
}

function changeInfo(direction) {
	let currentInfoEl = cardInfosContainerEl.querySelector(".current--info");
	let previousInfoEl = cardInfosContainerEl.querySelector(".previous--info");
	let nextInfoEl = cardInfosContainerEl.querySelector(".next--info");

	gsap.timeline()
		.to([buttons.prev, buttons.next], {
		duration: 0.2,
		opacity: 0.5,
		pointerEvents: "none",
	})
		.to(
		currentInfoEl.querySelectorAll(".text"),
		{
			duration: 0.4,
			stagger: 0.1,
			translateY: "-120px",
			opacity: 0,
		},
		"-="
	)
		.call(() => {
		swapInfosClass(direction);
	})
		.call(() => initCardEvents())
		.fromTo(
		direction === "right"
		? nextInfoEl.querySelectorAll(".text")
		: previousInfoEl.querySelectorAll(".text"),
		{
			opacity: 0,
			translateY: "40px",
		},
		{
			duration: 0.4,
			stagger: 0.1,
			translateY: "0px",
			opacity: 1,
		}
	)
		.to([buttons.prev, buttons.next], {
		duration: 0.2,
		opacity: 1,
		pointerEvents: "all",
	});

	function swapInfosClass() {
		currentInfoEl.classList.remove("current--info");
		previousInfoEl.classList.remove("previous--info");
		nextInfoEl.classList.remove("next--info");

		if (direction === "right") {
			currentInfoEl.classList.add("previous--info");
			nextInfoEl.classList.add("current--info");
			previousInfoEl.classList.add("next--info");
		} else if (direction === "left") {
			currentInfoEl.classList.add("next--info");
			nextInfoEl.classList.add("previous--info");
			previousInfoEl.classList.add("current--info");
		}
	}
}

function updateCard(e) {
	const card = e.currentTarget;
	const box = card.getBoundingClientRect();
	const centerPosition = {
		x: box.left + box.width / 2,
		y: box.top + box.height / 2,
	};
	let angle = Math.atan2(e.pageX - centerPosition.x, 0) * (35 / Math.PI);
	gsap.set(card, {
		"--current-card-rotation-offset": `${angle}deg`,
	});
	const currentInfoEl = cardInfosContainerEl.querySelector(".current--info");
	gsap.set(currentInfoEl, {
		rotateY: `${angle}deg`,
	});
}

function resetCardTransforms(e) {
	const card = e.currentTarget;
	const currentInfoEl = cardInfosContainerEl.querySelector(".current--info");
	gsap.set(card, {
		"--current-card-rotation-offset": 0,
	});
	gsap.set(currentInfoEl, {
		rotateY: 0,
	});
}

function initCardEvents() {
	const currentCardEl = cardsContainerEl.querySelector(".current--card");
	currentCardEl.addEventListener("pointermove", updateCard);
	currentCardEl.addEventListener("pointerout", (e) => {
		resetCardTransforms(e);
	});
}

initCardEvents();

function removeCardEvents(card) {
	card.removeEventListener("pointermove", updateCard);
}

function init() {

	let tl = gsap.timeline();

	tl.to(cardsContainerEl.children, {
		delay: 0.15,
		duration: 0.5,
		stagger: {
			ease: "power4.inOut",
			from: "right",
			amount: 0.1,
		},
		"--card-translateY-offset": "0%",
	})
		.to(cardInfosContainerEl.querySelector(".current--info").querySelectorAll(".text"), {
		delay: 0.5,
		duration: 0.4,
		stagger: 0.1,
		opacity: 1,
		translateY: 0,
	})
		.to(
		[buttons.prev, buttons.next],
		{
			duration: 0.4,
			opacity: 1,
			pointerEvents: "all",
		},
		"-=0.4"
	);
}

const waitForImages = () => {
	const images = [...document.querySelectorAll("img")];
	const totalImages = images.length;
	let loadedImages = 0;
	const loaderEl = document.querySelector(".loader span");

	gsap.set(cardsContainerEl.children, {
		"--card-translateY-offset": "100vh",
	});
	gsap.set(cardInfosContainerEl.querySelector(".current--info").querySelectorAll(".text"), {
		translateY: "40px",
		opacity: 0,
	});
	gsap.set([buttons.prev, buttons.next], {
		pointerEvents: "none",
		opacity: "0",
	});

	images.forEach((image) => {
		imagesLoaded(image, (instance) => {
			if (instance.isComplete) {
				loadedImages++;
				let loadProgress = loadedImages / totalImages;

				gsap.to(loaderEl, {
					duration: 1,
					scaleX: loadProgress,
					backgroundColor: `hsl(${loadProgress * 120}, 100%, 50%`,
				});

				if (totalImages == loadedImages) {
					gsap.timeline()
						.to(".loading__wrapper", {
						duration: 0.8,
						opacity: 0,
						pointerEvents: "none",
					})
						.call(() => init());
				}
			}
		});
	});
};

waitForImages();

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