Created
August 1, 2023 13:19
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Animated Continuous Sections with GSAP Observer
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<!-- | |
Sections animate in and out on scroll. Scroll up or down and the sections will wrap around after hitting the start or end. Uses GSAP for the animations. | |
--> | |
<header> | |
<div>Animated Sections</div> | |
<div><a href="https://codepen.io/BrianCross/pen/PoWapLP">Original By Brian</a></div> | |
</header> | |
<section class="first"> | |
<div class="outer"> | |
<div class="inner"> | |
<div class="bg one"> | |
<h2 class="section-heading">Scroll down</h2> | |
</div> | |
</div> | |
</div> | |
</section> | |
<section class="second"> | |
<div class="outer"> | |
<div class="inner"> | |
<div class="bg"> | |
<h2 class="section-heading">Animated with GSAP</h2> | |
</div> | |
</div> | |
</div> | |
</section> | |
<section class="third"> | |
<div class="outer"> | |
<div class="inner"> | |
<div class="bg"> | |
<h2 class="section-heading">GreenSock</h2> | |
</div> | |
</div> | |
</div> | |
</section> | |
<section class="fourth"> | |
<div class="outer"> | |
<div class="inner"> | |
<div class="bg"> | |
<h2 class="section-heading">Animation platform</h2> | |
</div> | |
</div> | |
</div> | |
</section> | |
<section class="fifth"> | |
<div class="outer"> | |
<div class="inner"> | |
<div class="bg"> | |
<h2 class="section-heading">Keep scrolling</h2> | |
</div> | |
</div> | |
</div> | |
</section> |
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gsap.registerPlugin(Observer); | |
let sections = document.querySelectorAll("section"), | |
images = document.querySelectorAll(".bg"), | |
headings = gsap.utils.toArray(".section-heading"), | |
outerWrappers = gsap.utils.toArray(".outer"), | |
innerWrappers = gsap.utils.toArray(".inner"), | |
splitHeadings = headings.map(heading => new SplitText(heading, { type: "chars,words,lines", linesClass: "clip-text" })), | |
currentIndex = -1, | |
wrap = gsap.utils.wrap(0, sections.length), | |
animating; | |
gsap.set(outerWrappers, { yPercent: 100 }); | |
gsap.set(innerWrappers, { yPercent: -100 }); | |
function gotoSection(index, direction) { | |
index = wrap(index); // make sure it's valid | |
animating = true; | |
let fromTop = direction === -1, | |
dFactor = fromTop ? -1 : 1, | |
tl = gsap.timeline({ | |
defaults: { duration: 1.25, ease: "power1.inOut" }, | |
onComplete: () => animating = false | |
}); | |
if (currentIndex >= 0) { | |
// The first time this function runs, current is -1 | |
gsap.set(sections[currentIndex], { zIndex: 0 }); | |
tl.to(images[currentIndex], { yPercent: -15 * dFactor }) | |
.set(sections[currentIndex], { autoAlpha: 0 }); | |
} | |
gsap.set(sections[index], { autoAlpha: 1, zIndex: 1 }); | |
tl.fromTo([outerWrappers[index], innerWrappers[index]], { | |
yPercent: i => i ? -100 * dFactor : 100 * dFactor | |
}, { | |
yPercent: 0 | |
}, 0) | |
.fromTo(images[index], { yPercent: 15 * dFactor }, { yPercent: 0 }, 0) | |
.fromTo(splitHeadings[index].chars, { | |
autoAlpha: 0, | |
yPercent: 150 * dFactor | |
}, { | |
autoAlpha: 1, | |
yPercent: 0, | |
duration: 1, | |
ease: "power2", | |
stagger: { | |
each: 0.02, | |
from: "random" | |
} | |
}, 0.2); | |
currentIndex = index; | |
} | |
Observer.create({ | |
type: "wheel,touch,pointer", | |
wheelSpeed: -1, | |
onDown: () => !animating && gotoSection(currentIndex - 1, -1), | |
onUp: () => !animating && gotoSection(currentIndex + 1, 1), | |
tolerance: 10, | |
preventDefault: true | |
}); | |
gotoSection(0, 1); | |
// original: https://codepen.io/BrianCross/pen/PoWapLP | |
// horizontal version: https://codepen.io/GreenSock/pen/xxWdeMK |
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<script src="https://assets.codepen.io/16327/gsap-latest-beta.min.js"></script> | |
<script src="https://assets.codepen.io/16327/Observer.min.js"></script> | |
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/16327/SplitText3.min.js"></script> |
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@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&display=swap"); | |
@import url("https://fonts.googleapis.com/css2?family=Cormorant+Garamond&display=swap"); | |
$bg-gradient: linear-gradient( | |
180deg, | |
rgba(0, 0, 0, 0.6) 0%, | |
rgba(0, 0, 0, 0.3) 100% | |
); | |
* { | |
box-sizing: border-box; | |
user-select: none; | |
} | |
a { | |
color: #fff; | |
text-decoration: none; | |
} | |
body { | |
margin: 0; | |
padding: 0; | |
height: 100vh; | |
color: white; | |
background: black; | |
font-family: "Cormorant Garamond", serif; | |
text-transform: uppercase; | |
} | |
h2 { | |
font-size: clamp(1rem, 5vw, 5rem); | |
font-weight: 400; | |
text-align: center; | |
letter-spacing: 0.5em; | |
margin-right: -0.5em; | |
color: hsl(0, 0, 80%); | |
width: 90vw; | |
max-width: 1200px; | |
} | |
header { | |
position: fixed; | |
display: flex; | |
align-items: center; | |
justify-content: space-between; | |
padding: 0 5%; | |
width: 100%; | |
z-index: 3; | |
height: 7em; | |
font-family: "Bebas Neue", sans-serif; | |
font-size: clamp(0.66rem, 2vw, 1rem); | |
letter-spacing: 0.5em; | |
} | |
section { | |
height: 100%; | |
width: 100%; | |
top: 0; | |
position: fixed; | |
visibility: hidden; | |
.outer, | |
.inner { | |
width: 100%; | |
height: 100%; | |
overflow-y: hidden; | |
} | |
.bg { | |
display: flex; | |
align-items: center; | |
justify-content: center; | |
position: absolute; | |
height: 100%; | |
width: 100%; | |
top: 0; | |
background-size: cover; | |
background-position: center; | |
h2 { | |
z-index: 2; | |
} | |
.clip-text { | |
overflow: hidden; | |
} | |
} | |
} | |
.first { | |
.bg { | |
background-image: $bg-gradient, | |
url(https://images.unsplash.com/photo-1617478755490-e21232a5eeaf?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxNzU1NjM5NA&ixlib=rb-1.2.1&q=75&w=1920); | |
} | |
} | |
.second { | |
.bg { | |
background-image: $bg-gradient, | |
url("https://images.unsplash.com/photo-1617128734662-66da6c1d3505?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxNzc3NTM3MA&ixlib=rb-1.2.1&q=75&w=1920"); | |
} | |
} | |
.third { | |
.bg { | |
background-image: $bg-gradient, | |
url(https://images.unsplash.com/photo-1617438817509-70e91ad264a5?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxNzU2MDk4Mg&ixlib=rb-1.2.1&q=75&w=1920); | |
} | |
} | |
.fourth { | |
.bg { | |
background-image: $bg-gradient, | |
url(https://images.unsplash.com/photo-1617412327653-c29093585207?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxNzU2MDgzMQ&ixlib=rb-1.2.1&q=75&w=1920); | |
} | |
} | |
.fifth { | |
.bg { | |
background-image: $bg-gradient, | |
url("https://images.unsplash.com/photo-1617141636403-f511e2d5dc17?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxODAzMjc4Mw&ixlib=rb-1.2.1&q=75w=1920"); | |
background-position: 50% 45%; | |
} | |
} | |
h2 * { | |
will-change: transform; | |
} |
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<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.2/css/all.min.css" rel="stylesheet" /> |
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