38 lines
1.0 KiB
JavaScript
38 lines
1.0 KiB
JavaScript
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'use strict';
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/**
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* Copyright (c) 2013-present, 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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* @typechecks
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*/
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/* eslint-disable fb-www/typeof-undefined */
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/**
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* Same as document.activeElement but wraps in a try-catch block. In IE it is
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* not safe to call document.activeElement if there is nothing focused.
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*
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* The activeElement will be null only if the document or document body is not
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* yet defined.
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*
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* @param {?DOMDocument} doc Defaults to current document.
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* @return {?DOMElement}
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*/
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function getActiveElement(doc) /*?DOMElement*/{
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doc = doc || (typeof document !== 'undefined' ? document : undefined);
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if (typeof doc === 'undefined') {
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return null;
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}
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try {
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return doc.activeElement || doc.body;
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} catch (e) {
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return doc.body;
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}
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}
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module.exports = getActiveElement;
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