learning/FindDomNode.html at master · RaulZhao/learning · GitHub

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<html>
    <head></head>
    <body>
        <div>
            <div id="dom1">
                <div></div>
                <div></div>
                <div>
                    <div>
                        <div></div>
                    </div>
                    <div>
                        <div id="node1">This is the node</div>
                        <div></div>
                    </div>
                </div>
                <div>
                    <div></div>
                </div>
            </div>

            <div id="dom2">
                <div></div>
                <div></div>
                <div>
                    <div>
                        <div></div>
                    </div>
                    <div>
                        <div>This is the other node</div>
                        <div></div>
                    </div>
                </div>
                <div>
                    <div></div>
                </div>
            </div>
        </div>
        <script type="text/javascript">
            var tree1 = document.getElementById("dom1"),
                tree2 = document.getElementById("dom2"),
                node1 = document.getElementById("node1");

            // NodeList.prototype.indexOf = function (item) {
            //     return Array.prototype.indexOf.call(this, item);
            // };
            //build a ref tree that contains the parent index
            function getPaths (childNode, baseNode, res) {
                res = res || [];
                if(childNode !== baseNode) {
                    var parentNode = childNode.parentNode;
                    if(parentNode) {
                        var index = Array.prototype.indexOf.call(parentNode.childNodes, childNode);
                        res.push(index);
                        return getPaths(parentNode, baseNode, res);
                    }
                }
                return res;
            }

            function getChildNodeFromParentTree (parentNode, treePaths) {
                var index = treePaths.pop();
                var childNode = parentNode.childNodes[index];

                if(treePaths.length > 0) {
                    return getChildNodeFromParentTree(childNode, treePaths);
                } else {
                    return childNode;
                }
            }

            var otherNode = getChildNodeFromParentTree(tree2, getPaths(node1, tree1));
            console.log("The node is: ", otherNode);
        </script>
    </body>
</html>