29 lines
620 B
JavaScript
29 lines
620 B
JavaScript
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/**
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* Returns the parent of a node.
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* Breaks through shadow roots.
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* Returns null if node has no parent.
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* @param {Node} node
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*/
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function getParent(node) {
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let parent = node.parentNode
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if (!parent) return null
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return parent.host ? parent.host : parent
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}
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/**
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* Returns an Iterator that walks the DOM tree upwards.
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* @param {Node} node
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*/
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export function createParentsIterator(node) {
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let curNode = node
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return {
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next: function() {
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curNode = getParent(curNode)
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return curNode ? { value: curNode } : { done: true }
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},
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[Symbol.iterator]: function() {
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return this
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}
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}
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}
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