Dan Abramov
6 years ago
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1 changed files with
3 additions and
6 deletions
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content/docs/hooks-faq.md
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@ -809,13 +809,10 @@ function Image(props) { |
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// ✅ IntersectionObserver is created lazily once |
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// ✅ IntersectionObserver is created lazily once |
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function getObserver() { |
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function getObserver() { |
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let observer = ref.current; |
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if (ref.current === null) { |
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if (observer !== null) { |
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ref.current = new IntersectionObserver(onIntersect); |
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return observer; |
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} |
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} |
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let newObserver = new IntersectionObserver(onIntersect); |
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return ref.current; |
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ref.current = newObserver; |
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return newObserver; |
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} |
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} |
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// When you need it, call getObserver() |
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// When you need it, call getObserver() |
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