export function scrollTop(el, from = 0, to, duration = 500) {
if (!window.requestAnimationFrame) {
window.requestAnimationFrame = (
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function (callback) {
return window.setTimeout(callback, 1000/60);
}
);
}
const difference = Math.abs(from - to);
const step = Math.ceil(difference / duration * 50);
function scroll(start, end, step) {
if (start === end) return;
let d = (start + step > end) ? end : start + step;
if (start > end) {
d = (start - step < end) ? end : start - step;
}
if (el === window) {
window.scrollTo(d, d);
} else {
el.scrollTop = d;
}
window.requestAnimationFrame(() => scroll(d, end, step));
}
scroll(from, to, step);
}
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