blob: 43a808b6ab3b5bddb4481b2a2597d0f18a32b217 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
|
export const isSticky = (el, scrollY, stickyTop) => {
const top = el.offsetTop - scrollY;
if (top === stickyTop) {
el.classList.add('is-stuck');
} else {
el.classList.remove('is-stuck');
}
};
export default (el) => {
if (!el) return;
const computedStyle = window.getComputedStyle(el);
if (!/sticky/.test(computedStyle.position)) return;
const stickyTop = parseInt(computedStyle.top, 10);
document.addEventListener('scroll', () => isSticky(el, window.scrollY, stickyTop), {
passive: true,
});
};
|
