29 lines
795 B
JavaScript
29 lines
795 B
JavaScript
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function getParentNode(node) {
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// document type
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if (node.nodeType === 9) {
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return null;
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}
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return node.parentNode;
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}
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export function getScrollParent(node) {
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if (node === null)
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return null;
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const parentNode = getParentNode(node);
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if (parentNode === null) {
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return null;
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}
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// Document
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if (parentNode.nodeType === 9) {
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return document.documentElement;
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}
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// Element
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if (parentNode.nodeType === 1) {
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// Firefox want us to check `-x` and `-y` variations as well
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const { overflow, overflowX, overflowY } = getComputedStyle(parentNode);
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if (/(auto|scroll|overlay)/.test(overflow + overflowY + overflowX)) {
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return parentNode;
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}
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}
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return getScrollParent(parentNode);
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}
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