Grouped Bars

Grouped bars showing religion by top 5 countries. This is an example from the tutorial Splitting Charts.

Draws from Stacked-to-Grouped Bars

<!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>
    
      .axis text {
        font-family: 'Open Sans', sans-serif;
        font-size: 19pt;
      }
      .axis .label {
        font-size: 20pt;
      }

.axis path, .axis line {
        fill: none;
        stroke: #000;
        shape-rendering: crispEdges;
      }

.color-legend text {
        font-family: 'Open Sans', sans-serif;
        font-size: 19pt;
      }

</style>
  </head>
  <body>
    <script>
      var outerWidth = 960;
      var outerHeight = 500;
      var margin = { left: 90, top: 8, right: 30, bottom: 66 };
      var barPadding = 0.2;

var xColumn = "country";
      var yColumn = "population";
      var colorColumn = "religion";
      var layerColumn = colorColumn;

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 yAxisG = g.append("g")
        .attr("class", "y axis");
      var colorLegendG = g.append("g")
        .attr("class", "color-legend")
        .attr("transform", "translate(596, 0)");

var xScale = d3.scale.ordinal().rangeBands([0, innerWidth], barPadding);
      var yScale = d3.scale.linear().range([innerHeight, 0]);
      var colorScale = d3.scale.category10();

var xAxis = d3.svg.axis().scale(xScale).orient("bottom")
        .outerTickSize(0);
      var yAxis = d3.svg.axis().scale(yScale).orient("left")
        .ticks(5)
        .tickFormat(d3.format("s"))
        .outerTickSize(0);

var colorLegend = d3.legend.color()
        .scale(colorScale)
        .shapePadding(6.24)
        .shapeWidth(25)
        .shapeHeight(25)
        .labelOffset(5);

function render(data){

var nested = d3.nest()
          .key(function (d){ return d[layerColumn]; })
          .entries(data)

var stack = d3.layout.stack()
          .y(function (d){ return d[yColumn]; })
          .values(function (d){ return d.values; });

var layers = stack(nested);

xScale.domain(layers[0].values.map(function (d){
          return d[xColumn];
        }));

yScale.domain([
          0,
          d3.max(layers, function (layer){
            return d3.max(layer.values, function (d){
              return d.y;
            });
          })
        ]);

colorScale.domain(layers.map(function (layer){
          return layer.key;
        }));

xAxisG.call(xAxis);
        yAxisG.call(yAxis);

var layers = g.selectAll(".layer").data(layers);
        layers.enter().append("g").attr("class", "layer");
        layers.exit().remove();
        layers.style("fill", function (d){
          return colorScale(d.key);
        });

colorLegendG.call(colorLegend)
          .selectAll("text")
          .attr("y", 4);
      }

function type(d){
        d.population = +d.population;
        return d;
      }

d3.csv("religionByCountryTop5.csv", type, render);

</script>
  </body>
</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js

https://cdnjs.cloudflare.com/ajax/libs/d3-legend/1.1.0/d3-legend.js