Tree Demo for woei

hello world

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
 
    <title>Collapsible Tree Example</title>
 
    <style>
 
	.node circle {
	  fill: #fff;
	  stroke: steelblue;
	  stroke-width: 3px;
	}
 
	.node text { font: 12px sans-serif; }
 
	.link {
	  fill: none;
	  stroke: #ccc;
	  stroke-width: 2px;
	}
	
    </style>
 
  </head>
 
  <body>
 
	
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
	
<script>
 
// ************** Generate the tree diagram	 *****************
var margin = {top: 20, right: 120, bottom: 20, left: 120},
	width = 960 - margin.right - margin.left,
	height = 500 - margin.top - margin.bottom;
	
var i = 0;
 
var tree = d3.layout.tree()
	.size([height, width]);
 
var diagonal = d3.svg.diagonal()
	.projection(function(d) { return [d.y, d.x]; });
 
var svg = d3.select("body").append("svg")
	.attr("width", width + margin.right + margin.left)
	.attr("height", height + margin.top + margin.bottom)
  .append("g")
	.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
 
// load the external data
d3.json("data.json", function(error, treeData) {
  root = treeData[0];
  update(root);
});
 
function update(source) {
 
  // Compute the new tree layout.
  var nodes = tree.nodes(root).reverse(),
	  links = tree.links(nodes);
 
  // Normalize for fixed-depth.
  nodes.forEach(function(d) { d.y = d.depth * 180; });
 
  // Declare the nodes…
  var node = svg.selectAll("g.node")
	  .data(nodes, function(d) { return d.id || (d.id = ++i); });
 
  // Enter the nodes.
  var nodeEnter = node.enter().append("g")
	  .attr("class", "node")
	  .attr("transform", function(d) { 
		  return "translate(" + d.y + "," + d.x + ")"; });
 
  nodeEnter.append("circle")
	  .attr("r", 10)
	  .style("fill", "#fff");
 
  nodeEnter.append("text")
	  .attr("x", function(d) { 
		  return d.children || d._children ? -13 : 13; })
	  .attr("dy", ".35em")
	  .attr("text-anchor", function(d) { 
		  return d.children || d._children ? "end" : "start"; })
	  .text(function(d) { return d.net_address; })
	  .style("fill-opacity", 1);
 
  // Declare the links…
  var link = svg.selectAll("path.link")
	  .data(links, function(d) { return d.target.id; });
 
  // Enter the links.
  link.enter().insert("path", "g")
	  .attr("class", "link")
	  .attr("d", diagonal);
 
}
 
</script>
	
  </body>
</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js