D3 Force Diagram Template with CSV files

## readme.md

      
          Raw
        
        
              readme.md
            
          
    This is a D3 force diagram template that brings in separate csv files of the links and nodes. Here the nodes are foods that can be in either "group1" (healthy) or "group2" (unhealthy"). The links are things that taste good together. Link "type1" is anything involving peanut butter. Link "type2" is any other kind of link. Separating out the links and nodes like this might make it easier to organize your information.

  
## index.html
// NODE KEY
// Green is group1
// Red is group2
// Blue is group3
// Black is group4
<br>
// LINK KEY
// Black is type1
// Yellow is type2


<!DOCTYPE html>
<meta charset="utf-8">
<style>

.link {
  stroke: #999;
  stroke-opacity: .6;
}

.node {
  stroke: #fff;
  stroke-width: .5px;
}

.node text {
  pointer-events: none;
  font: 15px sans-serif;
  font-weight: bolder;
}

.node.group1{
  fill: green;
  stroke-opacity: .3;
  stroke-width: 4;
}

.node.group2{
  fill: red;
  stroke-opacity: .3;
  stroke-width: 4;
}

.node.group3{
  fill: blue;
  stroke-opacity: .3;
  stroke-width: 4;
}

.node.group4{
  fill: black;
  stroke-opacity: .3;
  stroke-width: 4;
}

.link.type1{
  stroke: black;
  stroke-opacity: .3;
  stroke-width: 4;
}

.link.type2{
  stroke: red;
  stroke-opacity: .3;
  stroke-width: 4;
}
</style>
</style>
<body>
<script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script>
<script>

var linkpath = ("links.csv");
var nodepath = ("nodes.csv");

var width = 1000,
    height = 600;

var color = d3.scale.category20();


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


//Want to have different labels
// SETTING UP THE FORCE LAYOUT
  var force = d3.layout.force()
  //using width/height from above, but size is mainly det'd by linkDistance and charge
    .size([width, height])
    // how far between nodes
    .linkDistance(80)
    // changes how close nodes will get to each other. Neg is farther apart.
    .charge(-300);


d3.csv(nodepath, function(nodes) {

  var nodelookup = {};
  var nodecollector = {};

   count = 0;
// we want to create a lookup table that will relate the links file and the nodes file
    nodes.forEach(function(row) {
    nodelookup[row.node] = count;

    nodecollector[row.node] = {name: row.node, group: row.group};
    //console.log(nodecollector)

    //console.log(row.node)
    //console.log(nodelookup)

    count++;
 });

//Get all the links out of of the csv in a way that will match up with the nodes

d3.csv(linkpath, function(linkchecker) {

  var linkcollector = {};
  indexsource = 0;
  indextarget = 0;
    count= 0;
    //console.log(nodelookup['celery'])
    linkchecker.forEach(function(link) {

	linkcollector[count] = {source: nodelookup[link.source], target: nodelookup[link.target], type: link.type };
    //console.log(linkcollector[count])
	count++
});

//console.log(linkcollector)
var nodes = d3.values(nodecollector);
var links = d3.values(linkcollector);

//console.log(nodes)
//console.log(links)

  // Create the link lines.
  var link = svg.selectAll(".link")
      .data(links)
     .enter().append("line")
     .attr("class", function(d) { return "link " + d.type; })

  // Create the node circles.
  var node = svg.selectAll(".node")
      .data(nodes)
    .enter().append("g")
      .attr("class", "node")
    .call(force.drag);

 //put in little circles to drag
  node.append("circle")
      .attr("r", 4.5)
    .attr("class", function(d) { return "node " + d.group; })
    .call(force.drag);

//add the words
 node.append("text")
      .attr("dx", 12)
      .attr("dy", ".35em")
      .text(function(d) { return d.name });

//get it going!
 force
      .nodes(nodes)
      .links(links)
      .start();

  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; });

//I think that translate changes all of the x and ys at once instead of one by one?
    node.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });

  })


  });
  });

</script>

## links.csv

          
            source
            target
            type

            
              banana
              peanut butter
              type1

            
              celery
              peanut butter
              type1

            
              celery
              ranch dressing
              type2

            
              banana
              honey
              type2

            
              hummus
              celery
              type2

## nodes.csv

          
            node
            group

            
              celery
              group1

            
              peanut butter
              group2

            
              hummus
              group1

            
              banana
              group1

            
              honey
              group2

            
              ranch dressing
              group2