Created
February 23, 2020 17:35
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Check if element is in a viewport
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| /* | |
| No jQuery necessary. | |
| Thanks to Dan's StackOverflow answer for this: | |
| http://stackoverflow.com/questions/123999/how-to-tell-if-a-dom-element-is-visible-in-the-current-viewport | |
| */ | |
| function isOneHundredPercentOfElementInViewport(el) { | |
| var rect = el.getBoundingClientRect(); | |
| return ( | |
| rect.top >= 0 && | |
| rect.left >= 0 && | |
| rect.bottom <= (window.innerHeight || document. documentElement.clientHeight) && | |
| rect.right <= (window.innerWidth || document. documentElement.clientWidth) | |
| ); | |
| } | |
| function isAnyPartOfElementInViewport(el) { | |
| const rect = el.getBoundingClientRect(); | |
| // DOMRect { x: 8, y: 8, width: 100, height: 100, top: 8, right: 108, bottom: 108, left: 8 } | |
| const windowHeight = (window.innerHeight || document.documentElement.clientHeight); | |
| const windowWidth = (window.innerWidth || document.documentElement.clientWidth); | |
| // http://stackoverflow.com/questions/325933/determine-whether-two-date-ranges-overlap | |
| const vertInView = (rect.top <= windowHeight) && ((rect.top + rect.height) >= 0); | |
| const horInView = (rect.left <= windowWidth) && ((rect.left + rect.width) >= 0); | |
| return (vertInView && horInView); | |
| } |
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