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