D3 Examples - hierarchy

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .node {
      fill: steelblue;
      stroke: none;
    }
​
    .link {
      fill: none;
      stroke: #ccc;
      stroke-width: 1px;
    }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
    
    var nodes = svg.append("g")
    .classed("nodes", true);
    
    var links = svg.append("g")
    .classed("links", true);
    
    
    var newData = [{"parent": "A", "name": "B"},
                   {"parent": "A", "name": "C"},
                   {"parent": null, "name": "A"},
                   {"parent": "B", "name": "D"},
                   {"parent": "B", "name": "E"}]
    
    var root = d3.stratify()
        .id(function(d){return d.name;})
       .parentId(function(d){return d.parent;})
      (newData);
    
  
    var treeLayout = d3.tree();
    
    treeLayout.size([960, 500]);
    treeLayout(root);
    
    // Nodes
    nodes
      .selectAll('circle.node')
      .data(root.descendants())
      .enter()
      .append('circle')
      .classed('node', true)
      .attr('cx', function(d) {return d.x;})
      .attr('cy', function(d) {return d.y;})
      .attr('r', 4);
​
    // Links
   links
      .selectAll('line.link')
      .data(root.links())
      .enter()
      .append('line')
      .classed('link', true)
      .attr('x1', function(d) {return d.source.x;})
      .attr('y1', function(d) {return d.source.y;})
      .attr('x2', function(d) {return d.target.x;})
      .attr('y2', function(d) {return d.target.y;});
​
  </script>
</body>
​
    