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HTML

              
                
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <meta charset="utf-8">
    <style>
    .node {
       stroke: #fff;
        stroke-width: 1.5px;
    }
    .link {
        stroke: #999;
        stroke-opacity: .6;
    }
    </style>
</head>

<body>
    <script src="https://d3js.org/d3.v3.min.js"></script>
    <script>
        var graph = {
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    };

  var width = 900,
      height = 400;

  var color = d3.scale.category20();

  var force = d3.layout.force()
      .charge(-120)
      .linkDistance(30)
      .size([width, height]);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

  force
      .nodes(graph.nodes)
      .links(graph.links)
      .start();

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      .data(graph.links)
    .enter().append("line")
      .attr("class", "link")
      .style("stroke-width", function(d) { return Math.sqrt(d.value); });

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      .data(graph.nodes)
    .enter().append("circle")
      .attr("class", "node")
      .attr("r", 5)
      .style("fill", function(d) { return color(d.group); })
      .call(force.drag);

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        .attr("y2", function(d) { return d.target.y; });

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        .attr("cy", function(d) { return d.y; });
  });
    </script>
</body>

</html>
              
            
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