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47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
/**
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* Copyright 2013 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @providesModule insertNodeAt
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*/
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"use strict";
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/**
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* Inserts `node` at a particular child index. Other nodes move to make room.
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* @param {!Element} root The parent root node to insert into.
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* @param {!node} node The node to insert.
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* @param {!number} atIndex The index in `root` that `node` should exist at.
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*/
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function insertNodeAt(root, node, atIndex) {
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var childNodes = root.childNodes;
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// Remove from parent so that if node is already child of root,
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// `childNodes[atIndex]` already takes into account the removal.
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var curAtIndex = root.childNodes[atIndex];
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if (curAtIndex === node) {
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return node;
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}
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if (node.parentNode) {
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node.parentNode.removeChild(node);
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}
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if (atIndex >= childNodes.length) {
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root.appendChild(node);
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} else {
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root.insertBefore(node, childNodes[atIndex]);
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}
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return node;
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}
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module.exports = insertNodeAt;
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