D3 Examples - France population

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 10px sans-serif;
}
​
.departement {
  stroke-width: .3px;
  stroke: #333;
}
​
.caption {
  font-weight: bold;
}
​
.key path {
  display: none;
}
​
.key line {
  stroke: #000;
  shape-rendering: crispEdges;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script src="https://d3js.org/queue.v1.min.js"></script>
<script>
​
var width = 960,
    height = 500,
    formatNumber = d3.format("s");
​
var color = d3.scale.threshold()
    .domain([250000, 500000, 750000, 1000000, 1250000,1500000,1750000])
    .range(["#deebf7","#c6dbef","#9ecae1","#6baed6","#4292c6","#2171b5","#08519c","#08306b"]);
​
var x = d3.scale.linear()
    .domain([77156, 2579208])
    .range([0, 300]);
​
var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .tickSize(13)
    .tickValues(color.domain())
    .tickFormat(function(d) { return formatNumber(d); });
​
var projection = d3.geo.albers()
    .center([0, 49.5])
    .rotate([-2.8, 3])
    .parallels([45, 55])
    .scale(2500)
    .translate([width / 2, height / 2]);
​
var path = d3.geo.path()
    .projection(projection);
​
var svg = d3.select('body').append("svg")
    .attr("width", width)
    .attr("height", height);
​
var g = svg.append("g")
    .attr("class", "key")
    .attr("transform", "translate(" + 40 + "," + 40 + ")");
​
g.selectAll("rect")
    .data(color.range().map(function(currentColor) {
      var d = color.invertExtent(currentColor);
      if (d[0] == null) d[0] = x.domain()[0];
      if (d[1] == null) d[1] = x.domain()[1];
      return d;
    }))
  .enter().append("rect")
    .attr("height", 8)
    .attr("x", function(d) { return x(d[0]); })
    .attr("width", function(d) { return x(d[1]) - x(d[0]); })
    .style("fill", function(d) { return color(d[0]); });
​
g.call(xAxis).append("text")
    .attr("class", "caption")
    .attr("y", -6)
    .text("Population");
​
queue()
    .defer(d3.json, "france.json")
    .defer(d3.csv, "population.csv")
    .await(ready);
​
function ready(error, france, population) {
​
  var regions = svg.selectAll(".departements")
      .data(topojson.feature(france, france.objects.regions).features)
    .enter().append("path")
      .attr("class", "departement")
      .attr("d", path)
      .style("fill",function(departement){
        var paringData = population.filter(function(population){ return departement.properties.name === population.name; })[0];
        return paringData ? color(paringData.population) : color(0);
      });
 };
​
</script>
​
    