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.gallery
ul.cards
li.card 0
li.card 1
li.card 2
li.card 3
li.card 4
li.card 5
li.card 6
li.card 7
li.card 8
li.card 9
li.card 10
li.card 11
li.card 12
li.card 13
li.card 14
li.card 15
li.card 16
li.card 17
li.card 18
li.card 19
li.card 20
li.card 21
li.card 22
li.card 23
li.card 24
li.card 25
li.card 26
li.card 27
li.card 28
li.card 29
li.card 30
.actions
button.prev ◀ Prev
button.next Next ▶
button.refresh-btn(onclick="refreshCards()") Refresh Background
.instruction
ul
| Scroll the cards by
br
| any of the following:
br
br
li Action Buttons
li Mouse Wheel
li Up/Down Arrows
li Page-Up/Down
@import url("https://fonts.googleapis.com/css2?family=Roboto&family=Zen+Dots&display=swap");
* {
box-sizing: border-box;
}
body {
background: #222;
min-height: 100vh;
padding: 0;
margin: 0;
color: #fff;
font-family: "Zen Dots", sans-serif;
text-shadow: #000 1px 1px 5px, #000 -1px -1px 5px;
}
.gallery {
position: absolute;
width: 100%;
height: 100vh;
overflow: hidden;
}
.cards {
position: absolute;
width: 14rem;
height: 18rem;
top: 40%;
left: 50%;
transform: translate(-50%, -50%);
}
.cards li {
list-style: none;
padding: 0;
margin: 0;
width: 14rem;
height: 18rem;
text-align: center;
line-height: 18rem;
font-size: 2rem;
border: 5px solid white;
border-radius: 15px;
position: absolute;
top: 0;
left: 0;
background-size: cover;
box-shadow: #000 1px 1px 5px, #000 -1px -1px 5px;
}
@for $i from 1 through 31 {
.cards li:nth-of-type(#{$i}) {
background-image: url(https://picsum.photos/800/600?random=#{$i});
}
}
li:hover {
color: #fff;
transition: color 0.3s ease;
box-shadow: rgba(255, 255, 255, 0.6) 0px 4px 15px,
rgba(0, 0, 0, 0.3) 0px 4px 10px;
z-index: 10; /* Brings the hovered card to the front */
}
.actions {
position: absolute;
bottom: 25px;
left: 50%;
transform: translateX(-50%);
}
button {
display: inline-block;
outline: none;
border: none;
padding: 8px 14px;
background: #414141;
background-image: -webkit-linear-gradient(top, #575757, #414141);
background-image: -moz-linear-gradient(top, #575757, #414141);
background-image: -ms-linear-gradient(top, #575757, #414141);
background-image: -o-linear-gradient(top, #575757, #414141);
background-image: linear-gradient(to bottom, #575757, #414141);
text-shadow: #000 1px 1px 5px, #000 -1px -1px 5px;
box-shadow: #000 1px 1px 5px, #000 -1px -1px 5px;
color: #aaaaaa;
text-decoration: none;
margin: 0 auto 10px;
border-radius: 4px;
padding: 12px 25px;
font-family: "Zen Dots", sans-serif;
text-transform: uppercase;
cursor: pointer;
font-size: 10px;
font-weight: 400;
line-height: 18px;
&:hover {
background: #57a818;
background-image: -webkit-linear-gradient(top, #57a818, #4d9916);
background-image: -moz-linear-gradient(top, #57a818, #4d9916);
background-image: -ms-linear-gradient(top, #57a818, #4d9916);
background-image: -o-linear-gradient(top, #57a818, #4d9916);
background-image: linear-gradient(to bottom, #57a818, #4d9916);
text-shadow: 0px 1px 0px #32610e;
box-shadow: 0px 1px 0px fefefe;
color: #ffffff;
text-decoration: none;
}
}
.refresh-btn {
position: fixed;
top: 20px;
right: 20px;
padding: 10px 20px;
background: #007bff;
color: white;
border: solid 2px black;
border-radius: 5px;
cursor: pointer;
transition: background 0.3s ease;
filter: drop-shadow(1px 2px 1px rgba(0, 0, 50, 0.7))
drop-shadow(2px 4px 3px rgba(0, 0, 0, 0.5));
}
.refresh-btn:hover {
background: #0056b3;
}
.instruction {
position: fixed;
top: 80px;
right: 20px;
padding: 10px 20px;
font-size: 0.8rem;
}
/* Source: https://codepen.io/tommyho tommyho510@gmail.com */
/* Source: https://codepen.io/GreenSock/pen/qBqEZKg
*/
/* try moving the cards with screen buttons, mouse roller, keyboard page up or down, and keyboard up or down arrows */
gsap.registerPlugin(ScrollTrigger);
let iteration = 0;
const spacing = 0.1,
snap = gsap.utils.snap(spacing),
cards = gsap.utils.toArray(".cards li"),
seamlessLoop = buildSeamlessLoop(cards, spacing),
scrub = gsap.to(seamlessLoop, {
// we reuse this tween to smoothly scrub the playhead on the seamlessLoop
totalTime: 0,
duration: 0.5,
ease: "power3",
paused: true
}),
trigger = ScrollTrigger.create({
start: 0,
onUpdate(self) {
if (self.progress === 1 && self.direction > 0 && !self.wrapping) {
wrapForward(self);
} else if (self.progress < 1e-5 && self.direction < 0 && !self.wrapping) {
wrapBackward(self);
} else {
scrub.vars.totalTime = snap(
(iteration + self.progress) * seamlessLoop.duration()
);
scrub.invalidate().restart(); // to improve performance, we just invalidate and restart the same tween. No need for overwrites or creating a new tween on each update.
self.wrapping = false;
}
},
end: "+=3000",
pin: ".gallery"
});
function wrapForward(trigger) {
// when the ScrollTrigger reaches the end, loop back to the beginning seamlessly
iteration++;
trigger.wrapping = true;
trigger.scroll(trigger.start + 1);
}
function wrapBackward(trigger) {
// when the ScrollTrigger reaches the start again (in reverse), loop back to the end seamlessly
iteration--;
if (iteration < 0) {
// to keep the playhead from stopping at the beginning, we jump ahead 10 iterations
iteration = 9;
seamlessLoop.totalTime(
seamlessLoop.totalTime() + seamlessLoop.duration() * 10
);
scrub.pause(); // otherwise it may update the totalTime right before the trigger updates, making the starting value different than what we just set above.
}
trigger.wrapping = true;
trigger.scroll(trigger.end - 1);
}
function scrubTo(totalTime) {
// moves the scroll position to the place that corresponds to the totalTime value of the seamlessLoop, and wraps if necessary.
let progress =
(totalTime - seamlessLoop.duration() * iteration) / seamlessLoop.duration();
if (progress > 1) {
wrapForward(trigger);
} else if (progress < 0) {
wrapBackward(trigger);
} else {
trigger.scroll(trigger.start + progress * (trigger.end - trigger.start));
}
}
document
.querySelector(".next")
.addEventListener("click", () => scrubTo(scrub.vars.totalTime + spacing));
document
.querySelector(".prev")
.addEventListener("click", () => scrubTo(scrub.vars.totalTime - spacing));
function buildSeamlessLoop(items, spacing) {
let overlap = Math.ceil(1 / spacing), // number of EXTRA animations on either side of the start/end to accommodate the seamless looping
startTime = items.length * spacing + 0.5, // the time on the rawSequence at which we'll start the seamless loop
loopTime = (items.length + overlap) * spacing + 1, // the spot at the end where we loop back to the startTime
rawSequence = gsap.timeline({ paused: true }), // this is where all the "real" animations live
seamlessLoop = gsap.timeline({
// this merely scrubs the playhead of the rawSequence so that it appears to seamlessly loop
paused: true,
repeat: -1, // to accommodate infinite scrolling/looping
onRepeat() {
// works around a super rare edge case bug that's fixed GSAP 3.6.1
this._time === this._dur && (this._tTime += this._dur - 0.01);
}
}),
l = items.length + overlap * 2,
time = 0,
i,
index,
item;
// set initial state of items
gsap.set(items, { xPercent: 300, opacity: 0, scale: 0 });
// now loop through and create all the animations in a staggered fashion. Remember, we must create EXTRA animations at the end to accommodate the seamless looping.
for (i = 0; i < l; i++) {
index = i % items.length;
item = items[index];
time = i * spacing;
rawSequence
.fromTo(
item,
{ scale: 0, opacity: 0 },
{
scale: 1,
opacity: 1,
zIndex: 100,
duration: 0.5,
yoyo: true,
repeat: 1,
ease: "power1.in",
immediateRender: false
},
time
)
.fromTo(
item,
{ xPercent: 300 },
{ xPercent: -300, duration: 1, ease: "none", immediateRender: false },
time
);
i <= items.length && seamlessLoop.add("label" + i, time); // we don't really need these, but if you wanted to jump to key spots using labels, here ya go.
}
// here's where we set up the scrubbing of the playhead to make it appear seamless.
rawSequence.time(startTime);
seamlessLoop
.to(rawSequence, {
time: loopTime,
duration: loopTime - startTime,
ease: "none"
})
.fromTo(
rawSequence,
{ time: overlap * spacing + 1 },
{
time: startTime,
duration: startTime - (overlap * spacing + 1),
immediateRender: false,
ease: "none"
}
);
return seamlessLoop;
}
function refreshCards() {
const cards = document.querySelectorAll(".card");
cards.forEach((card, index) => {
card.style.animation = "none";
card.style.background = `url('https://picsum.photos/800/600?random=${
index + 1
}&t=${Date.now()}') center/cover no-repeat`;
card.offsetHeight; // Trigger reflow
card.style.animation = null;
});
}
Also see: Tab Triggers