D3 Examples - d3.js + dijkstra

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  width: 1024px;
  margin-top: 0;
  margin: auto;
  font-family: "Lato", "PT Serif", serif;
  color: #222222;
  padding: 0;
  font-weight: 300;
  line-height: 33px;
  -webkit-font-smoothing: antialiased;
}
​
.node {
  stroke: #7f8c8d;
  stroke-width: 1.5px;
  fill: #bdc3c7;
  stroke-dasharray: 2px, 2px;
}
​
​
.link {
  stroke: #ecf0f1;
  stroke-opacity: .6;
}
​
.linktext{
  fill: #95a5a6;
  background-color: #ffffff;
}
​
text {
    pointer-events: none;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="dijkstra.js"></script>
<script>
​
var width = 960,
    height = 500;
​
var color = d3.scale.category20();
​
var force = d3.layout.force()
    .charge(-4020)
    .linkDistance(90)
    .size([width, height]);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
d3.csv("network.csv", function(error, data) {
  
  var nodes = [], nodesByName = {}, links = [];
  function addNodeByName(fullname) {
    var name = fullname.split(',')[0];
    if (!nodesByName[name]) {
      var node = {"name":name, "links":[]}
      nodesByName[name] = node;
      nodes.push(node);
      return node;
    }
    else
      return nodesByName[name];
  }
​
  data.forEach(function(d) {
    for (k in d) {
      if (d.hasOwnProperty(k) && k != "nodes" && d[k] < 750) {
        links.push({"source": addNodeByName(d["nodes"]), "target": addNodeByName(k), "value": parseInt(Math.random()*d[k]*5+1), 'id':addNodeByName(d["nodes"]).name+addNodeByName(k).name })
      }
    } 
  });
​
  force
      .nodes(nodes)
      .links(links)
      .start();
​
  var glink = svg.append('g').selectAll(".link")
      .data(links).enter()
​
  var link = glink.append("line")
      .attr("class", function(d){ return "link "+d.id})
      .style("stroke-width", 2);
​
  var linktext = glink.append('text')
      .attr("class", function(d){ return "linktext "+d.id})
      .attr('text-anchor', 'middle')
      .style('opacity', 0)
      .text(function(d){ return d.value})
​
  var gnode = svg.append('g').selectAll(".node")
      .data(nodes).enter()
​
  var node = gnode.append("circle")
      .attr("class", function(d){ return 'node '+d.name})
      .attr("r", 15)
      .call(force.drag);
​
  var nodetext = gnode.append('text')
      .attr('text-anchor', 'middle')
      .attr('dy', '0.35em')
      .attr("class", function(d){ return "nodetext "+d.name})
      .text(function(d){ return d.name})
​
  
  link.each(function(d) {
      d.source.links.push(d);
      d.selection = d3.select(this);
  });
​
  node.each(function(d) {
      d.selection = d3.select(this);
  });
  
  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; });
​
    linktext.attr("x", function(d) { return (d.source.x + d.target.x)/2 ; })
        .attr("y", function(d) { return (d.source.y + d.target.y)/2; })
​
    nodetext.attr("x", function(d) { return d.x ; })
        .attr("y", function(d) { return d.y; })
​
    node.attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });
  });
​
  
  node.on("mouseover", function(d) {
      d3.select(this).attr('r', 16.5);
      
  });
​
  node.on("mouseout", function(d) {
      d3.select(this).attr('r', 15);
  });
    
  var dijkstra = d3.dijkstra()
    .nodes(nodes)
    .edges(links);
​
  node.on("click", dijkstra.start);
​
 });
​
</script>
    