Created
October 19, 2021 03:12
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| // modified from https://gist.github.com/hsablonniere/2581101 | |
| function getParent(el) { | |
| var parent = el.parentNode; | |
| if (parent === document) { | |
| return document; | |
| } else if (parent.offsetHeight < parent.scrollHeight || parent.offsetWidth < parent.scrollWidth) { | |
| return parent; | |
| } else { | |
| return getParent(parent); | |
| } | |
| } | |
| // scrollIntoViewIfNeeded not supported in IE, Firefox | |
| if (!Element.prototype.scrollIntoViewIfNeeded) { | |
| Element.prototype.scrollIntoViewIfNeeded = function (centerIfNeeded) { | |
| centerIfNeeded = arguments.length === 0 ? true : !!centerIfNeeded; | |
| var parent = getParent(this), // not only with direct parent | |
| parentComputedStyle = window.getComputedStyle(parent, null), | |
| parentBorderTopWidth = parseInt(parentComputedStyle.getPropertyValue('border-top-width')), | |
| parentBorderLeftWidth = parseInt(parentComputedStyle.getPropertyValue('border-left-width')), | |
| overTop = this.offsetTop - parent.offsetTop < parent.scrollTop, | |
| overBottom = (this.offsetTop - parent.offsetTop + this.clientHeight - parentBorderTopWidth) > (parent.scrollTop + parent.clientHeight), | |
| overLeft = this.offsetLeft - parent.offsetLeft < parent.scrollLeft, | |
| overRight = (this.offsetLeft - parent.offsetLeft + this.clientWidth - parentBorderLeftWidth) > (parent.scrollLeft + parent.clientWidth), | |
| alignWithTop = overTop && !overBottom; | |
| if ((overTop || overBottom) && centerIfNeeded) { | |
| parent.scrollTop = this.offsetTop - parent.offsetTop - parent.clientHeight / 2 - parentBorderTopWidth + this.clientHeight / 2; | |
| } | |
| if ((overLeft || overRight) && centerIfNeeded) { | |
| parent.scrollLeft = this.offsetLeft - parent.offsetLeft - parent.clientWidth / 2 - parentBorderLeftWidth + this.clientWidth / 2; | |
| } | |
| if ((overTop || overBottom || overLeft || overRight) && !centerIfNeeded) { | |
| this.scrollIntoView(alignWithTop); | |
| } | |
| }; | |
| } |
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