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getScrollPos.ts
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getScrollPos.ts
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/*
* Copyright 2019 LABOR.digital
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Last modified: 2019.02.01 at 14:36
*/
import {isBrowser} from '../Environment/isBrowser';
import {isUndefined} from '../Types/isUndefined';
/**
* Returns the vertical scroll position of either the window or the given container object
* Returns 0 if not called in a browser
*
* @param container An optional container element to get the scroll position of, otherwise the window is used
* @param horizontal If set to true the horizontal (X) scroll position is returned, instead of the default (Y)
*/
export function getScrollPos(container?: HTMLElement | Window, horizontal?: boolean): number
{
if (!isBrowser()) {
return 0;
}
if (isUndefined(container) || container === window) {
return horizontal === true ?
window.scrollX || window.pageXOffset || document.documentElement.scrollLeft :
window.scrollY || window.pageYOffset || document.documentElement.scrollTop;
}
return horizontal === true ? (container as HTMLElement).scrollLeft : (container as HTMLElement).scrollTop;
}