diff options
Diffstat (limited to 'FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts')
-rw-r--r-- | FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts b/FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts index 8a2bd7a0..67c7c458 100644 --- a/FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts +++ b/FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts @@ -7,19 +7,31 @@ export default function useReverseScrollPositionRemember(): void { if (on) return; on = true; - let scrollPosition = - document.documentElement.scrollHeight - - document.documentElement.scrollTop; - + function getScrollPosition(): number { + if (document.documentElement.scrollHeight <= window.innerHeight) { + return 0; + } else { + return ( + document.documentElement.scrollHeight - + document.documentElement.scrollTop - + window.innerHeight + ); + } + } + + let scrollPosition = getScrollPosition(); const scrollListener = (): void => { - scrollPosition = document.documentElement.scrollHeight - window.scrollY; + scrollPosition = getScrollPosition(); }; window.addEventListener("scroll", scrollListener); const resizeObserver = new ResizeObserver(() => { + if (document.documentElement.scrollHeight <= window.innerHeight) return; document.documentElement.scrollTop = - document.documentElement.scrollHeight - scrollPosition; + document.documentElement.scrollHeight - + window.innerHeight - + scrollPosition; }); resizeObserver.observe(document.documentElement); |