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29 lines
1.0 KiB
29 lines
1.0 KiB
3 years ago
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/* eslint-disable no-cond-assign, no-continue */
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import css from './css';
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import height from './height';
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import isDocument from './isDocument';
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/**
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* Find the first scrollable parent of an element.
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*
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* @param element Starting element
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* @param firstPossible Stop at the first scrollable parent, even if it's not currently scrollable
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*/
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export default function scrollParent(element, firstPossible) {
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var position = css(element, 'position');
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var excludeStatic = position === 'absolute';
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var ownerDoc = element.ownerDocument;
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if (position === 'fixed') return ownerDoc || document; // @ts-ignore
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while ((element = element.parentNode) && !isDocument(element)) {
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var isStatic = excludeStatic && css(element, 'position') === 'static';
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var style = (css(element, 'overflow') || '') + (css(element, 'overflow-y') || '') + css(element, 'overflow-x');
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if (isStatic) continue;
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if (/(auto|scroll)/.test(style) && (firstPossible || height(element) < element.scrollHeight)) {
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return element;
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}
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}
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return ownerDoc || document;
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}
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