31 lines
892 B
JavaScript
31 lines
892 B
JavaScript
|
/**
|
||
|
|
* Copyright (c) 2013-present, Facebook, Inc.
|
||
|
|
*
|
||
|
|
* This source code is licensed under the MIT license found in the
|
||
|
|
* LICENSE file in the root directory of this source tree.
|
||
|
|
*
|
||
|
|
* @typechecks
|
||
|
|
*/
|
||
|
|
|
||
|
|
'use strict';
|
||
|
|
|
||
|
|
var isWebkit = typeof navigator !== 'undefined' && navigator.userAgent.indexOf('AppleWebKit') > -1;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Gets the element with the document scroll properties such as `scrollLeft` and
|
||
|
|
* `scrollHeight`. This may differ across different browsers.
|
||
|
|
*
|
||
|
|
* NOTE: The return value can be null if the DOM is not yet ready.
|
||
|
|
*
|
||
|
|
* @param {?DOMDocument} doc Defaults to current document.
|
||
|
|
* @return {?DOMElement}
|
||
|
|
*/
|
||
|
|
function getDocumentScrollElement(doc) {
|
||
|
|
doc = doc || document;
|
||
|
|
if (doc.scrollingElement) {
|
||
|
|
return doc.scrollingElement;
|
||
|
|
}
|
||
|
|
return !isWebkit && doc.compatMode === 'CSS1Compat' ? doc.documentElement : doc.body;
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = getDocumentScrollElement;
|