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43 lines
1.2 KiB
43 lines
1.2 KiB
10 years ago
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/**
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* Copyright 2013-2015, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule containsNode
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* @typechecks
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*/
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var isTextNode = require("./isTextNode");
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/*jslint bitwise:true */
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/**
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* Checks if a given DOM node contains or is another DOM node.
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*
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* @param {?DOMNode} outerNode Outer DOM node.
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* @param {?DOMNode} innerNode Inner DOM node.
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* @return {boolean} True if `outerNode` contains or is `innerNode`.
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*/
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function containsNode(outerNode, innerNode) {
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if (!outerNode || !innerNode) {
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return false;
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} else if (outerNode === innerNode) {
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return true;
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} else if (isTextNode(outerNode)) {
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return false;
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} else if (isTextNode(innerNode)) {
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return containsNode(outerNode, innerNode.parentNode);
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} else if (outerNode.contains) {
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return outerNode.contains(innerNode);
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} else if (outerNode.compareDocumentPosition) {
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return !!(outerNode.compareDocumentPosition(innerNode) & 16);
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} else {
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return false;
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}
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}
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module.exports = containsNode;
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