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June 29, 2021 23:57
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Find parent scrolling context from DOM element
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| function getScrollContext( node ) { | |
| let at = node; | |
| let hasOverflow = false; | |
| while ( at.parentNode !== at.ownerDocument ) { | |
| at = at.parentNode; | |
| if ( at.clientHeight < at.scrollHeight ) { | |
| hasOverflow = true; | |
| break; | |
| } | |
| } | |
| return [ at, hasOverflow ]; | |
| } |
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