38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
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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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'use strict';
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/**
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* Gets the scroll position of the supplied element or window.
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*
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* The return values are unbounded, unlike `getScrollPosition`. This means they
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* may be negative or exceed the element boundaries (which is possible using
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* inertial scrolling).
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*
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* @param {DOMWindow|DOMElement} scrollable
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* @return {object} Map with `x` and `y` keys.
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*/
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function getUnboundedScrollPosition(scrollable) {
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if (scrollable.Window && scrollable instanceof scrollable.Window) {
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return {
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x: scrollable.pageXOffset || scrollable.document.documentElement.scrollLeft,
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y: scrollable.pageYOffset || scrollable.document.documentElement.scrollTop
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};
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}
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return {
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x: scrollable.scrollLeft,
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y: scrollable.scrollTop
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};
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}
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module.exports = getUnboundedScrollPosition;
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