import Vue from 'vue';
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export default function scrollIntoView(container, selected) {
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if (Vue.prototype.$isServer) return;
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if (!selected) {
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container.scrollTop = 0;
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return;
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}
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const offsetParents = [];
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let pointer = selected.offsetParent;
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while (pointer && container !== pointer && container.contains(pointer)) {
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offsetParents.push(pointer);
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pointer = pointer.offsetParent;
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}
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const top = selected.offsetTop + offsetParents.reduce((prev, curr) => (prev + curr.offsetTop), 0);
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const bottom = top + selected.offsetHeight;
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const viewRectTop = container.scrollTop;
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const viewRectBottom = viewRectTop + container.clientHeight;
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if (top < viewRectTop) {
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container.scrollTop = top;
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} else if (bottom > viewRectBottom) {
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container.scrollTop = bottom - container.clientHeight;
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}
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}
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