@fluentui/dom-utilities/lib/elementContains.js

DOM utilities for use within Fluent web components

import { getParent } from './getParent';
/**
 * Determines whether or not a parent element contains a given child element.
 * If `allowVirtualParents` is true, this method may return `true` if the child
 * has the parent in its virtual element hierarchy.
 *
 * @public
 */
export function elementContains(parent, child, allowVirtualParents) {
    if (allowVirtualParents === void 0) { allowVirtualParents = true; }
    var isContained = false;
    if (parent && child) {
        if (allowVirtualParents) {
            if (parent === child) {
                isContained = true;
            }
            else {
                isContained = false;
                while (child) {
                    var nextParent = getParent(child);
                    if (nextParent === parent) {
                        isContained = true;
                        break;
                    }
                    child = nextParent;
                }
            }
        }
        else if (parent.contains) {
            isContained = parent.contains(child);
        }
    }
    return isContained;
}
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