28. stacked bar (states on x-axis, age groups stacked)

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

.bar {
  fill: steelblue;
}

.axis path {
  display: none;
}

</style>

var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var x = d3.scaleBand()
    .rangeRound([0, width])
    .padding(0.1)
    .align(0.1);// check whether chart is displaying

var y = d3.scaleLinear()
    .rangeRound([height, 0]);
 
// ---- set 7 custom colors to scale-map data input
//   var color = d3.scaleOrdinal(d3.schemeCategory10);
  
var z = d3.scaleOrdinal()
    .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);

var stack = d3.stack();

d3.csv("data.csv", type, function(error, data) { // -test at bottom
  if (error) throw error;
 
  
  
//   -test-
//     console.log(data.map(function(d){return d.total}));   
  data.sort(function(a, b) { return b.total - a.total; });// -test
// --- test: sort() upon data using d.total
//     console.log(data.map(function(d){return d.total}));

//   return of map() and args of d3.max()
  x.domain(data.map(function(d) { return d.State; }));
  y.domain([0, d3.max(data, function(d) { return d.total; })]).nice();
// - test: nicely rounded
//   console.log(y.domain());  
  
  z.domain(data.columns.slice(1));
// ---- use of .slice(1) ---  
// console.log(data.columns.slice(1));  
// console.log(data.columns);  
  
  
  
  
// ---- test: how to stack.keys()(data)   
//   console.log(stack.keys(data.columns.slice(1))(data));
//     console.log(stack.keys(data.columns.slice(1))(data).map(function(d){return d.key}));    
  
//    ToDo: x-axis not state by age group
  g.selectAll(".serie")
    .data(stack.keys(data.columns.slice(1))(data)) // -test 
    .enter().append("g")
      .attr("class", "serie")
      .attr("fill", function(d) { return z(d.key); })
    .selectAll("rect")
    .data(function(d) { return d; }) 
    .enter().append("rect") 
      .attr("x", function(d) { return x(d.data.State); })
      .attr("y", function(d) { return y(d[1]); })
//---- get logic clear: higher value from d[0] smaller px from y(d[0])
      .attr("height", function(d) { return y(d[0]) - y(d[1]); }) // y(d[0])-y(d[1]) is always positive
      .attr("width", x.bandwidth());

//   --- test -----
// console.log(stack.keys(data.columns.slice(1))(data)[1][0]); 
// var a1 = stack.keys(data.columns.slice(1))(data)[0][0];
// console.log(y(a1[0]) - y(a1[1])); 
// console.log(stack.keys(data.columns.slice(1))(data)[1][0]);   
  
  g.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));

// --- test: y.ticks(10) ---  
//   console.log(y.ticks(10));
//   console.log(y.ticks(10).pop());  
  
  g.append("g")
      .attr("class", "axis axis--y")
      .call(d3.axisLeft(y).ticks(10, "s"))
    .append("text")
      .attr("x", 2)
      .attr("y", y(y.ticks(10).pop()))// -test
      .attr("dy", "0.35em")
      .attr("text-anchor", "start")
      .attr("fill", "#000")
      .text("Population");

//   -- test: --
//   console.log(data.columns.slice(1).reverse());
   
  
  var legend = g.selectAll(".legend")
    .data(data.columns.slice(1).reverse())// -test
    .enter().append("g")
      .attr("class", "legend")
      .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; })
      .style("font", "10px sans-serif");

legend.append("rect")
      .attr("x", width - 18)
      .attr("width", 18)
      .attr("height", 18)
      .attr("fill", z); // -understand logic

legend.append("text")
      .attr("x", width - 24)
      .attr("y", 9)
      .attr("dy", ".35em")
      .attr("text-anchor", "end")
      .text(function(d) { return d; });
  
//    ----- test: object["colname"] is working -----
//   console.log(data);  
//   console.log(data.columns);  
// //     console.log(data[0].columns); // not working
//   var colnames = data.columns; 
//   console.log(data[0]);
//   console.log(data[0].State);
//   console.log(data[0][colnames[0]]);
//   console.log(data[0][data.columns[1]]);

}); 
 
// ---- columns acts as data.columns
function type(d, i, columns) {
  for (i = 1, t = 0; i < columns.length; ++i) t += d[columns[i]] = +d[columns[i]];
  d.total = t;
  return d;
}

</script>

https://d3js.org/d3.v4.min.js