D3 Examples - Labeled Force Layout

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.link {
  stroke: #ccc;
}
​
.node text {
  pointer-events: none;
  font: 10px sans-serif;
}
​
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
​
var width = 1800,
    height = 1800;
​
​
function zoomed() {
  container.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
}
​
function dragstarted(d) {
  d3.event.sourceEvent.stopPropagation();
  d3.select(this).classed("dragging", true);
}
​
function dragged(d) {
  d3.select(this).attr("cx", d.x = d3.event.x).attr("cy", d.y = d3.event.y);
}
​
function dragended(d) {
  d3.select(this).classed("dragging", false);
}
  
​
var zoom = d3.behavior.zoom()
    .scaleExtent([1, 10])
    .on("zoom", zoomed);
​
var drag = d3.behavior.drag()
    .origin(function(d) { return d; })
    .on("dragstart", dragstarted)
    .on("drag", dragged)
    .on("dragend", dragended);
  
var color = d3.scale.category20c();
  
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
var force = d3.layout.force()
    .gravity(0.05)
    .distance(100)
    .charge(-50)
    .size([width, height]);
​
d3.json("graph.json", function(error, json) {
  if (error) throw error;
​
  force
      .nodes(json.nodes)
      .links(json.links)
      .start();
​
  var link = svg.selectAll(".link")
      .data(json.links)
    .enter().append("line")
      .attr("class", "link");
​
  var node = svg.selectAll(".node")
      .data(json.nodes)
    .enter().append("g")
      .attr("class", "node")
      .call(force.drag);
​
​
  node.append("circle")
      .attr("r", 3)
      .style("fill", function(d) { console.log('d: ', d); return color(d.group); });;
​
  node.append("text")
      .attr("dx", 12)
      .attr("dy", ".35em")
      .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("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
  });
});
​
</script>
​
    