Light Speed In
The element streaks in from off screen, leaning back with the speed, then brakes hard: it tips forward past upright and rocks back straight.
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How to use it
- Paste the snippet just before
</head>. - Add
data-light-speed-into any element.
Options
Add any of these attributes to the same element.
data-from | The side it comes from: right or left. Give both, right left, and each loop uses the next. Default right. |
data-skew | How far it leans at full speed, in degrees. Default 30. |
data-distance | Travel this many px instead of starting fully off screen. |
data-duration | How long the entrance takes. Default 900 ms. |
data-delay | Wait before the first entrance. Default 0 ms. |
data-loop | Hold, fade away and streak in again. |
data-hold | How long it stays before fading, when looping. Default 1400 ms. |
It starts just past the edge of the nearest container that clips its overflow (overflow: hidden or clip), or of the window if there isn’t one. Put it in a clipping wrapper, or give the page overflow-x: clip, so it can’t make the page scroll sideways while it’s off screen.
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/bundles/anime.umd.min.js"></script>
<script>
(function () {
// Light Speed In: the element streaks in from off screen, skewed by its
// speed, then brakes hard: it leans forward past upright and straightens.
// Usage: <div data-light-speed-in>…</div>
// It starts just past the edge of the nearest container that clips its
// overflow (overflow: hidden or clip), or of the window.
// Optional: data-from ("right", default, or "left"; give both, "right
// left", and each loop uses the next), data-skew (degrees of lean at full
// speed, default 30), data-distance (px to travel instead of from off
// screen), data-duration (ms, default 900), data-delay (ms before the
// first entrance), data-loop (hold, fade away and streak in again),
// data-hold (ms to stay when looping, default 1400).
var DEFAULTS = { from: 'right', skew: 30, duration: 900, delay: 0, hold: 1400 };
function reduced() {
return window.matchMedia('(prefers-reduced-motion: reduce)').matches;
}
// The box the element must leave to be "off screen".
function clipBox(el) {
for (var p = el.parentElement; p && p !== document.body; p = p.parentElement) {
var s = getComputedStyle(p);
if (s.overflowX !== 'visible' || s.overflowY !== 'visible') return p.getBoundingClientRect();
}
return { left: 0, top: 0, right: window.innerWidth, bottom: window.innerHeight };
}
function enter(el, from, done) {
var d = el.dataset;
var t = +d.duration || DEFAULTS.duration;
var skew = d.skew === undefined ? DEFAULTS.skew : +d.skew || 0;
var r = el.getBoundingClientRect();
var c = clipBox(el);
// +1 when it comes from the right (moving left), -1 from the left.
var dir = from === 'left' ? -1 : 1;
var dist = +d.distance || (dir > 0 ? c.right - r.left : r.right - c.left) + 8;
// At speed its top trails behind.
anime.utils.set(el, { x: dir * dist, skewX: -dir * skew, opacity: 0 });
anime.animate(el, {
x: { to: 0, duration: t * 0.6, ease: 'out(3)' },
skewX: [
// Braking throws the top forward, then it rocks back upright.
{ to: dir * skew * 0.66, duration: t * 0.6, ease: 'out(2)' },
{ to: -dir * skew * 0.17, duration: t * 0.2, ease: 'inOut(2)' },
{ to: 0, duration: t * 0.2, ease: 'out(2)' }
],
opacity: { to: 1, duration: t * 0.5, ease: 'out(2)' },
onComplete: done
});
}
function cycle(el) {
var d = el.dataset;
var s = el._lsi;
var froms = (d.from || DEFAULTS.from).split(/[\s,]+/);
enter(el, froms[s.n++ % froms.length], function () {
if (d.loop === undefined || d.loop === 'false') return;
setTimeout(function () {
anime.animate(el, {
opacity: 0,
duration: 400,
ease: 'out(2)',
onComplete: function () {
// Wait until it's back on screen before the next entrance.
setTimeout(function () {
if (s.visible) cycle(el);
else s.waiting = true;
}, 500);
}
});
}, +d.hold || DEFAULTS.hold);
});
}
function init() {
var io = new IntersectionObserver(function (entries) {
entries.forEach(function (e) {
var s = e.target._lsi;
s.visible = e.isIntersecting;
if (!e.isIntersecting) return;
if (!s.started) {
s.started = true;
setTimeout(function () { cycle(e.target); }, +e.target.dataset.delay || DEFAULTS.delay);
} else if (s.waiting) {
s.waiting = false;
cycle(e.target);
}
});
}, { threshold: 0.2 });
document.querySelectorAll('[data-light-speed-in]').forEach(function (el) {
if (el._lsi) return;
el._lsi = { n: 0 };
if (reduced()) return;
anime.utils.set(el, { opacity: 0 });
io.observe(el);
});
}
if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', init);
else init();
})();
</script><div class="card" data-light-speed-in>Fast delivery</div>
<!-- or from the left, leaning harder: -->
<div class="card" data-light-speed-in data-from="left" data-skew="40">Fast delivery</div>