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check if element is in viewport - vanilla JS. Use by adding a “scroll” event listener to the window and then calling isInViewport().
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| const inViewport = (element: Element): boolean => { | |
| const rect = element.getBoundingClientRect(); | |
| const html = document.documentElement; | |
| return ( | |
| rect.top >= 0 && | |
| rect.left >= 0 && | |
| rect.bottom <= (window.innerHeight ?? html.clientHeight) && | |
| rect.right <= (window.innerWidth ?? html.clientWidth) | |
| ); | |
| }; |
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