Do not actually understand why this code part not working as it should. This useEffect
block re-renders on every scrollY position. Also, I see that this code part: console.log(wrapperRef.current.style.opacity);
should call if and else if statements, but it does not.
Here is the code:
useEffect(() => { console.log(wrapperRef.current.style.opacity); if (wrapperRef.current.style.opacity === 0) { setIsHidden(true); console.log("true"); } else if (wrapperRef.current.style.opacity === 1) { setIsHidden(false); console.log("false"); } }, [position]);
As you can see here, style values are strings, but with the ===
operator you also check for type equality.
This means you check that '0' === 0
which are not the same types and also why your check never enters the if body.
Either check for '0'
or use the ==
operator which does ignore types.
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