D3 Examples - Metis Simple Stacked Bar Chart with Labels

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .bartext {
      font-size: 12px;
    }
  </style>
</head>
​
<body>
  <svg width="960" height="500"></svg>
​
  <script>
​
  var margin = {top: 10, right: 20, bottom: 20, left: 60},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
  var y = d3.scaleLinear()
        .rangeRound([height, 0]);
​
  var x = d3.scaleBand()
    .rangeRound([0, width])
    .paddingInner(0.05)
    .align(0.1);
​
  var g = d3.select("svg")
          .append("g")
          .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
  d3.csv("us-unemployment-2017.csv", function(data) {
     console.log('Original data', data);
     data.sort(function(a, b) { return b.Rate - a.Rate; });
     x.domain(data.map(function(d) { return d.StateCode; }));
     y.domain([0, d3.max(data, function(d) { return d.Rate; })]).nice();
​
    g.append("g")
     .attr("class", "axis")
     .attr("transform", "translate(0," + height + ")")
     .call(d3.axisBottom(x));
​
    g.append("g")
      .attr("class", "axis")
      .call(d3.axisLeft(y).ticks(null, "s"))
​
     var bars = g.selectAll(".bar")
                 .data(data)
     // exit
     bars.exit().remove();
​
     // enter
     // Add things that don't depend on data change
     var enter = bars.enter().append('g');
     enter.append("rect")  // inherit the data
          .attr("class", "bar")
          .attr("x", function(d) { return x(d.StateCode); })
          .attr("y", function(d) { return y(d.Rate); })
          .attr("width", x.bandwidth()) // width of the rectangle
          .attr("height", function(d) { return height - y(d.Rate); })
          .attr('fill', 'blue')
​
    enter.append('text') // bound on the parent
         .attr("class", "bartext")
​
    // enter + update
    // What's left on the screen once you've removed the extraneous.
    // Merge what is displayed -- what's added and what's remaining.
    // Add things that should be re-rendered with data change.
    bars = enter.merge(bars)
​
    bars.select('text')
        // include x and y values to position the text
        .attr('x', function(d) { return x(d.StateCode)})
        .attr('y', function(d) { return y(d.Rate)} )
        .text(function(d){ return d.Rate})
​
    // Grouping with D3 nest
    var groupedByRegion = d3.nest().key(function(d) {return d.Region}).entries(data);
    console.log('groupedByRegion', groupedByRegion);
    var groupedBySubRegion = d3.nest().key(function(d) {return d.Subregion}).entries(data);
    var groupedByState = d3.nest().key(function(d) {return d.StateName}).entries(data);
    console.log('groupedByState', groupedByState)
​
    // Statistics
    var averageUnemploymentByRegion = d3.nest().key(function(d) {return d.Region}).rollup(function(v) { return d3.mean(v, function(d) { return parseInt(d.Rate);}); }).entries(data);
    var averageUnemploymentbySubregion = d3.nest().key(function(d) {return d.Subregion}).rollup(function(v) { return d3.mean(v, function(d) { return parseInt(d.Rate);}); }).entries(data);
    console.log('averageUnemploymentByRegion', averageUnemploymentByRegion);
    console.log('averageUnemploymentbySubregion', averageUnemploymentbySubregion);
​
  });
​
  </script>
</body>
​
    