package.lib.util.getScrollParent.mjs Maven / Gradle / Ivy
export function getScrollParent(el) {
let includeHidden = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
while (el) {
if (includeHidden ? isPotentiallyScrollable(el) : hasScrollbar(el)) return el;
el = el.parentElement;
}
return document.scrollingElement;
}
export function getScrollParents(el, stopAt) {
const elements = [];
if (stopAt && el && !stopAt.contains(el)) return elements;
while (el) {
if (hasScrollbar(el)) elements.push(el);
if (el === stopAt) break;
el = el.parentElement;
}
return elements;
}
export function hasScrollbar(el) {
if (!el || el.nodeType !== Node.ELEMENT_NODE) return false;
const style = window.getComputedStyle(el);
return style.overflowY === 'scroll' || style.overflowY === 'auto' && el.scrollHeight > el.clientHeight;
}
function isPotentiallyScrollable(el) {
if (!el || el.nodeType !== Node.ELEMENT_NODE) return false;
const style = window.getComputedStyle(el);
return ['scroll', 'auto'].includes(style.overflowY);
}
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