Simple Intersection Observer
Based on Amelie Benoit's post
Created
April 30, 2021 20:45
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Simple Intersection Observer
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| <html> | |
| <body> | |
| <main> | |
| <div style="height: 100vh;border:1px solid red;" data-track-visible="1">Coucou</div> | |
| <div style="height: 100vh;border:1px solid red;" data-track-visible="2">Coucou</div> | |
| <div style="height: 100vh;border:1px solid red;" data-track-visible="3">Coucou</div> | |
| <div style="height: 100vh;border:1px solid red;" data-track-visible="4">Coucou</div> | |
| <div style="height: 100vh;border:1px solid red;" data-track-visible="5">Coucou</div> | |
| </main> | |
| <script src="./index.js"></script> | |
| </body> | |
| </html> |
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| const onObserve = entries => { | |
| return entries.forEach(entry => { | |
| if (entry.intersectionRatio > 0) { | |
| const track_value = entry.target.dataset.trackVisible; | |
| console.log(track_value, 'entered the view!'); | |
| observer.unobserve(entry.target); | |
| } | |
| }); | |
| }; | |
| const observer = new IntersectionObserver(onObserve); | |
| document.querySelectorAll("[data-track-visible]").forEach((el) => observer.observe(el)); |
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https://dev.to/producthackers/intersection-observer-using-react-49ko