D3 Examples - Visual Implementation (Node Link View)

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<!DOCTYPE html>
<meta charset="utf-8">
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<title>Node-Link View</title>
<style>
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.node {
  stroke: #fff;
  stroke-width: 1.5px;
}
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.link {
  stroke: #999;
  stroke-opacity: .6;
}
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.legend rect {
  fill:white;
  stroke:black;
  opacity:0.8;}
​
</style>
<body>
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<h1>Node Link View - Color Coding with starting letter</h1>
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<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="d3.legend.js"></script>
<script>
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var width = 1060,
    height = 600;
    d3.select(self.frameElement).style("height", "900px");
var color = d3.scale.category10();
​
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);
​
d3.json("USstates.json", function(error, graph) {
  force
      .nodes(graph.nodes)
      .links(graph.links)
      .start();
​
  var link = svg.selectAll(".link")
      .data(graph.links)
    .enter().append("line")
      .attr("class", "link")
      .style("stroke-width", function(d) { return Math.sqrt(d.value); });
​
  var node = svg.selectAll(".node")
      .data(graph.nodes)
    .enter().append("circle")
      .attr("class", "node")
      .attr("r", 8)
      .style("fill", function(d) { return color(d.group); })
        .attr("data-legend",function(d) { return d.category; })
      .call(force.drag);
       
    legend = svg.append("g")
    .attr("class","legend")
    .attr("transform","translate(800,140)")
    .style("font-size","16px")
    .call(d3.legend);
    
      legend.append("text")
      .attr("x", width - 24)
      .attr("y", 9)
      .attr("dy", ".25em")
      .style("text-anchor", "end")
      .text(function(d) { return d; });
     
  node.append("title")
      .text(function(d) { return d.name; });
      
     
  force.on("tick", function() {
    link.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; });
​
    node.attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });
  });
});
​
</script>
    