The useInView hook

My first go to for scroll animations is the whileInView prop discussed on the previous lesson. However, there are cases where you would like to have a variable in JavaScript too.

You might want to trigger specific events, play a sound, or run other JavaScript logic based on the inview state of an element. For this, there is a hook called useInView.

Basic implementation

The useInView hook is a function that accepts a ref to an HTML element. It will then track if that element is in view or not and return a boolean for you with that state.

As you can see in the example below, the hook does not return its own ref, but rather expects you to pass one.

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const Component = () => {
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  const elementRef = useRef(null);
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  const isInView = useInView(elementRef);
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  return (
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    <div ref={elementRef} />
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  );
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}