D3 Examples - Multi-Line Chart of Largest Countries

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>D3 Example</title>
    <script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/d3-legend/1.1.0/d3-legend.js"></script>
    <link href='https://fonts.googleapis.com/css?family=Open+Sans' rel='stylesheet' type='text/css'>
        
    <style>
      
      body {
        margin: 0px;
      }
​
      .chart-line {
        fill: none;
        stroke-width: 5px;
      }
    
      .axis text {
        font-family: 'Open Sans', sans-serif;
        font-size: 12pt;
      }
      .axis .label {
        font-size: 18pt;
      }
​
      .axis path, .axis line {
        fill: none;
        stroke: #000;
        shape-rendering: crispEdges;
      }
​
      .color-legend text {
        font-family: 'Open Sans', sans-serif;
        font-size: 12pt;
      }
​
    </style>
  </head>
  <body>
    <script>
    
      var outerWidth = 960;
      var outerHeight = 500;
      var margin = { left: 86, top: 5, right: 5, bottom: 56 };
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      var xColumn = "year";
      var yColumn = "population";
      var colorColumn = "country";
      var lineColumn = colorColumn;
​
      var xAxisLabelText = "Time";
      var xAxisLabelOffset = 48;
​
      var yAxisLabelText = "Population";
      var yAxisLabelOffset = 60;
​
      var innerWidth  = outerWidth  - margin.left - margin.right;
      var innerHeight = outerHeight - margin.top  - margin.bottom;
​
      var svg = d3.select("body").append("svg")
        .attr("width", outerWidth)
        .attr("height", outerHeight);
      var g = svg.append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
      var xAxisG = g.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + innerHeight + ")")
      var xAxisLabel = xAxisG.append("text")
        .style("text-anchor", "middle")
        .attr("transform", "translate(" + (innerWidth / 2) + "," + xAxisLabelOffset + ")")
        .attr("class", "label")
        .text(xAxisLabelText);
​
      var yAxisG = g.append("g")
        .attr("class", "y axis");
      var yAxisLabel = yAxisG.append("text")
        .style("text-anchor", "middle")
        .attr("transform", "translate(-" + yAxisLabelOffset + "," + (innerHeight / 2) + ") rotate(-90)")
        .attr("class", "label")
        .text(yAxisLabelText);
​
      var colorLegendG = g.append("g")
        .attr("class", "color-legend")
        .attr("transform", "translate(16, 2)");
​
      var xScale = d3.time.scale().range([0, innerWidth]);
      var yScale = d3.scale.linear().range([innerHeight, 0]);
      var colorScale = d3.scale.category10();
​
      // Use a modified SI formatter that uses "B" for Billion.
      var siFormat = d3.format("s");
      var customTickFormat = function (d){
        return siFormat(d).replace("G", "B");
      };
​
      var xAxis = d3.svg.axis().scale(xScale).orient("bottom")
        .ticks(10)
        .outerTickSize(0);
      var yAxis = d3.svg.axis().scale(yScale).orient("left")
        .ticks(13)
        .tickFormat(customTickFormat)
        .outerTickSize(0);
​
      var line = d3.svg.line()
        .x(function(d) { return xScale(d[xColumn]); })
        .y(function(d) { return yScale(d[yColumn]); });
​
      var colorLegend = d3.legend.color()
        .scale(colorScale)
        .shapePadding(3)
        .shapeWidth(15)
        .shapeHeight(15)
        .labelOffset(4);
​
      function render(data){
​
        xScale.domain(d3.extent(data, function (d){ return d[xColumn]; }));
        yScale.domain([0, d3.max(data, function (d){ return d[yColumn]; })]);
​
        xAxisG.call(xAxis);
        yAxisG.call(yAxis);
​
        var nested = d3.nest()
          .key(function (d){ return d[lineColumn]; })
          .entries(data);
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        colorScale.domain(nested.map(function (d){ return d.key; }));
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        var paths = g.selectAll(".chart-line").data(nested);
        paths.enter().append("path").attr("class", "chart-line");
        paths.exit().remove();
        paths
          .attr("d", function (d){ return line(d.values); })
          .attr("stroke", function (d){ return colorScale(d.key); });
​
        colorLegendG.call(colorLegend);
      }
​
      function type(d){
        d.year = new Date(d.year);
        d.population = +d.population;
        return d;
      }
​
      d3.csv("populationByCountryByYear.csv", type, render);
​
    </script>
  </body>
</html>
    