Created
June 22, 2022 05:07
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| // https://standard.shiftbrain.com/blog/default-action-for-click-event-of-a-element | |
| import gsap from "gsap"; | |
| import ScrollToPlugin from "gsap/ScrollToPlugin"; | |
| import { forceFocus } from "./dom-utils"; | |
| gsap.registerPlugin(ScrollToPlugin); | |
| window.addEventListener( | |
| "click", | |
| (event) => { | |
| const anchorElement = (event.target as HTMLElement).closest<HTMLAnchorElement>('a[href*="#"]'); | |
| const anchorHash = anchorElement?.hash; | |
| if (!anchorHash) { | |
| return; | |
| } | |
| if (event.button === 0 && !isModifiedEvent(event)) { | |
| if (location.hash !== anchorHash) { | |
| history.pushState(null, "", anchorHash); | |
| } | |
| let target = document.querySelector<HTMLElement>(anchorHash); | |
| if (!target && anchorHash === "#top") { | |
| target = document.documentElement; | |
| } | |
| if (target) { | |
| scrollIntoView(target); | |
| forceFocus(target, { preventScroll: true }); | |
| event.preventDefault(); | |
| } | |
| } | |
| }, | |
| { capture: true } | |
| ); | |
| function isModifiedEvent(event: MouseEvent) { | |
| return event.ctrlKey || event.shiftKey || event.altKey || event.metaKey; | |
| } | |
| function scrollIntoView(element: HTMLElement) { | |
| const shouldReduceMotion = window.matchMedia("(prefers-reduced-motion)").matches; | |
| const style = getComputedStyle(element); | |
| gsap.to(window, { | |
| duration: shouldReduceMotion ? 0 : 0.5, | |
| scrollTo: { | |
| ...ScrollToPlugin.getOffset(element, window), | |
| offsetX: parseFloat((style as any).scrollMarginLeft), | |
| offsetY: parseFloat((style as any).scrollMarginTop), | |
| }, | |
| }); | |
| } |
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