D3 Examples - simple cluster

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.node circle { 
  fill: #999;
}
​
.node text {
  font: 10px sans-serif;
}
​
.node--internal circle {
  fill: #555;
}
​
.node--internal text {
  text-shadow: 0 1px 0 #fff, 0 -1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff;
}
​
.link {
  fill: none;
  stroke: #555;
  stroke-opacity: 0.4;
  stroke-width: 1.5px;
}
​
</style>
<svg width="500" height="400"></svg>
<script src="//d3js.org/d3.v4.js"></script>
<script>
  
  var treeData = {
    "name": "1",
    "children": [ 
    {"name": "11", "children": [ 
    {"name": "111", "size": 1},
    {"name": "112", "size": 1},
    {"name": "113", "size": 1},
    {"name": "114", "children": [
    {"name": "1141", "size": 1},
    {"name": "1142", "size": 1}]
    }]
    },
    {"name": "12", "children": [
    {"name": "121", "children": [
    {"name": "1211", "size": 1},
    {"name": "1212", "size": 1}]
    },
    {"name": "122", "size": 1}]
    }]
}
;
​
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height"),
    g = svg.append("g");
​
var tree = d3.cluster()
    .size([width, height]);
  
var node = d3.hierarchy(treeData)
​
/*var stratify = d3.stratify()
    .parentId(function(d) { return d.id.substring(0, d.id.lastIndexOf(".")); });*/
​
/*d3.csv("flare.csv", function(error, data) {
  if (error) throw error;
​
  var root = stratify(data)
      .sort(function(a, b) { return (a.height - b.height) || a.id.localeCompare(b.id); });*/
​
var root = tree(node); 
​
var link = g.selectAll(".link") 
      .data(root.descendants().slice(1))
    .enter().append("path")
      .attr("class", "link")
      .attr("d", function(d) {
        return "M" + d.x + "," + d.y
            + "C" + (d.parent.x) + "," + d.y
            + " " + (d.parent.x) + "," + d.parent.y
            + " " + d.parent.x + "," + d.parent.y;
      });
​
  var node = g.selectAll(".node")
      .data(root.descendants())
    .enter().append("g")
      .attr("class", function(d) { return "node" + (d.children ? " node--internal" : " node--leaf"); })
      .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
​
  node.append("circle")
      .attr("r", 2.5);
​
  /*node.append("text")
      .attr("dy", 3)
      .attr("x", function(d) { return d.children ? -8 : 8; })
      .style("text-anchor", function(d) { return d.children ? "end" : "start"; })
      .text(function(d) { return d.id.substring(d.id.lastIndexOf(".") + 1); });*/
//});
​
</script>
    