D3 Examples - Multi-line chart

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<!DOCTYPE HTML>
<script src="https://d3js.org/d3.v4.min.js"></script>
<style type="text/css">
  svg {
    border:1px solid #000000;
  }
  text {
    font-size: 14px;
  }
  path, line {
    fill:none
  }
</style>
<body></body>
<script>
  // properties
  var margin = {top: 20, right: 20, bottom: 20, left: 75};
  var width = 800 - margin.left - margin.right;
  var height = 600 - margin.top - margin.bottom;
  var yscale = d3.scaleLinear();
  var xscale = d3.scaleLinear();
  var radius = d3.scaleSqrt();
  var color = d3.scaleOrdinal(d3.schemeCategory20b);
  var line = d3.line()
    .x(function(d) {return xscale(d.year);})
    .y(function(d) {return yscale(d.yield);});
  
  d3.csv('barleyfull.csv', function(err, response) {
    if (err) { throw(error)}
 
    response.forEach(function(d) {
      d.yield = +d.yield;
      d.year = +d.year;
    });
    
    var nested = d3.nest()
        .key(function(d){ return d.site; })
        .key(function(d){ return d.gen; }) 
//       .key(function(d){ return d.year; })
            .entries(response);  
​
    yscale
        .range([height,0])
        .domain([0, 
              d3.max(response, function(d){return d.yield})]);
    
    xscale
        .range([0,width])
        .domain([1927, 1936]);
    
    radius
        .range([0, 12])
        .domain([0, 
              d3.max(response, function(d){return d.yield})]);
    
    
    var chart = d3.select("body")
        .append("div")
        .datum(nested[1]);
    chart.append("h2")
        .text(
            function(d) { return d.key; })
 
    var yaxis = d3.axisLeft()
        .scale(yscale);
    
    var xaxis = d3.axisBottom()
        .tickFormat(function(d) { return d; })
        .scale(xscale);
    
    var svg = chart.append('svg')
    .attr('width', width + margin.left + margin.right)
    .attr('height', height + margin.top + margin.bottom)
    .append('g')
        .attr('transform', 'translate(' + [margin.left, margin.top] + ')');
   
    svg.append("g")
        .call(yaxis);
    
    svg.append("g")
        .attr("transform", "translate(0," + height +")")
        .call(xaxis);
    
    var gens = svg.selectAll("g.sites")
        .data(function(d) {return d.values;})
        .enter().append("g")
        .attr("class", function(d) {return d.key; })
        .attr("transform", function(d){
      return "translate(0," + yscale(d.key) + ")"
    });
    
//    gens.selectAll("circle")
//      .data(function(d){ return d.values;})
//          .enter().append("circle")
//      .attr("r", function (d) {return radius(d.yield); })
//      .attr("cy", function (d) {return yscale(d.yield)})
//      .attr("cx", function(d) { return xscale(d.year); })
//          .attr("fill", function(d) { return color(d.gen); })    
 
   gens.append("path")
        .attr("class","line")
        .attr("d", function(d) { return line(d.values);})
        .style("stroke", function(d) { return color(d.key);})
   gens.append("text")
        .attr("x", function(d) 
            { return d.values[d.values.length-1].year })
            .attr("y", function(d) 
            { return d.values[d.values.length-1].yield })
        .attr("alignment-baseline", "middle")
        .text(function(d){return d.key;})
    .style("fill", function(d) {return d3.rgb(color(d.key)).darker(0.65);})  
    console.log(nested);
  });
  </script>
  
  
​
    