70 lines
1.7 KiB
TypeScript
70 lines
1.7 KiB
TypeScript
import { tween } from './animate.js'
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export function getCssValue(el: HTMLElement | null, property: string): number {
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const val = el?.ownerDocument?.defaultView?.getComputedStyle(el, null)?.[
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property as any
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]
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const num = Number.parseInt(val as string, 10)
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return Number.isNaN(num) ? 0 : num
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}
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export function getScrollTop(
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target: Document | HTMLElement = document,
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): number {
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if (target === document || !target) {
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return (
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window.pageYOffset
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|| document.documentElement.scrollTop
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|| document.body.scrollTop
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|| 0
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)
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}
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else {
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return (target as HTMLElement).scrollTop
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}
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}
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export function setScrollTop(
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target: Document | HTMLElement = document,
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scrollTop = 0,
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): void {
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if (typeof target === 'number') {
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scrollTop = target
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target = document
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document.documentElement.scrollTop = scrollTop
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document.body.scrollTop = scrollTop
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}
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else {
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if (target === document) {
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document.body.scrollTop = scrollTop || 0
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document.documentElement.scrollTop = scrollTop || 0
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}
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else {
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;(target as HTMLElement).scrollTop = scrollTop || 0
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}
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}
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}
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export function scrollTo(
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target: Document | HTMLElement,
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top: number,
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time = 300,
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): void {
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if (target !== document) {
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const currentTop = getScrollTop(target)
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const step = Math.ceil(time / 16)
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let currentStep = 0
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const change = top - currentTop
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const timer = setInterval(() => {
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currentStep++
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if (currentStep >= step)
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timer && clearInterval(timer)
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setScrollTop(target, tween(currentStep, currentTop, change, step))
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}, 1000 / 60)
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}
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else {
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window.scrollTo({ top, behavior: 'smooth' })
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}
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}
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