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42 lines
1.2 KiB
42 lines
1.2 KiB
/** |
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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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