D3 Examples -

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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; }
  </style>
</head>
​
<body>
  <script>
        var width = 700,
          height = 580;
​
        var svg = d3.select( "body" )
        .append( "svg" )
          .attr( "width", width )
          .attr( "height", height );
    
    var color=d3.scaleOrdinal(20);
        color.domain([0, 2000]);
​
    var projection = d3.geoConicConformal() // 
                .center([2.454071, 46.279229]).scale(2800);
​
    var path = d3.geoPath() // d3.geo.path avec d3 version 3
                 .projection(projection);
    
        d3.json("regions_France.json", function(json) {
        svg.selectAll("path")
           .data(json.features)
           .enter()
           .append("path")
           .attr("d", path)
             .attr("class","regions")
            .style("fill",function() {return color(100)});
        });
    
/*
    var dataValue = parseFloat(data[i].somme2014);
    
​
​
​
d3.csv("GrippeFrance2014.csv", function(data) {
​
    d3.json("regions_France.json", function(json) {
      //On fusionne les donnees avec le GeoJSON des regions
      for (var i = 0; i < data.length; i++) {
     svg.selectAll(".regions")
     .data(data)
     .enter().insert("path", ".graticule");
      });
    });
/*
      svg.selectAll("path")
      ...
        .style("fill", function(d) {
              var value = d.properties.value;
              return color(d.color = d3.max(somme2014[i], function(n) { return color(d); }) + 1 | 0); });
      });
    });*/
});
                    
</script>
</body>
​
    