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[Fix] Update React hook useScroll #71

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[Fix] Update React hook useScroll #71

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eb59ec6
[Fix] Correctly set scrolled state on first render
KentHHarris Oct 18, 2023
336ff20
Annotate function for clarity
KentHHarris Oct 18, 2023
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7 changes: 7 additions & 0 deletions lib/hooks/use-scroll.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,10 @@
import { useCallback, useEffect, useState } from "react";

/**
* React hook to observe scroll postion.
* @param threshold {number} The y-axis position to observe.
* @returns {boolean} `True` when the user's vertical scroll position is greater than the `threshold`; otherwise, `False`.
*/
export default function useScroll(threshold: number) {
const [scrolled, setScrolled] = useState(false);

Expand All @@ -8,6 +13,8 @@ export default function useScroll(threshold: number) {
}, [threshold]);

useEffect(() => {
window && onScroll(); // Call on first render. This correctly updates the `scrolled` state to `True` if the user's scroll position is greater than the `threshold` during the initial load.

window.addEventListener("scroll", onScroll);
return () => window.removeEventListener("scroll", onScroll);
}, [onScroll]);
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