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/**
* Copyright (c) 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule getActiveElement
* @typechecks
*/
/* eslint-disable fb-www/typeof-undefined */
/**
* Same as document.activeElement but wraps in a try-catch block. In IE it is
* not safe to call document.activeElement if there is nothing focused.
*
* The activeElement will be null only if the document or document body is not
* yet defined.
*
* @param {?DOMDocument} doc Defaults to current document.
* @return {?DOMElement}
*/
function getActiveElement(doc) /*?DOMElement*/{
doc = doc || (typeof document !== 'undefined' ? document : undefined);
if (typeof doc === 'undefined') {
return null;
}
try {
return doc.activeElement || doc.body;
} catch (e) {
return doc.body;
}
}
module.exports = getActiveElement;
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