Old school D3 from simpler times

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grippe_fr_novembre2014

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .hidden {
        display: none;
    }
    div.tooltip {
        color: #222;
        background-color: #fff;
        padding: .5em;
        text-shadow: #f5f5f5 0 1px 0;
        border-radius: 2px;
        opacity: 0.9;
        position: absolute;
    }
  </style>
</head>

<body>
  <script>
		var width = 700,
  		  height = 580;

var svg = d3.select( "body" )
  		.append( "svg" )
		  .attr( "width", width )
		  .attr( "height", height );

var projection = d3.geo.conicConformal()
    			.translate([width/2, height/2])
    			.center([2.454071, 46.279229])
    			.scale(3000)

var path = d3.geo.path()
                 .projection(projection);
    
    var color = d3.scale.quantize()
                   .range(["#fff7f3",
                            "#fde0dd",
                            "#fcc5c0",
                            "#fa9fb5",
                            "#f768a1",
                            "#dd3497",
                            "#ae017e",
                            "#7a0177"]);
    
    var tooltip = d3.select('body').append('div')
            .attr('class', 'hidden tooltip');
    
    var slider = svg.append("g2")
                    .attr("class", "slider");
    
    d3.csv("GrippeFrance2014.csv", function(data){
      //color.domain([0, 3500]); //Pour l'affichage de tout 2014
      color.domain([0, 240]); //Pour l'affichage de Novembre 2014
      
      d3.json("regions.json", function(json) {
        for (var i = 0; i < data.length; i++) {
          //Pour l'affichage de tout 2014
        	//var new_val = parseFloat(data[i].somme2014);
          //Pour l'affichage de Novembre 2014
          var new_val = 0;
          for(var k = 1; k < 32; k++){
            if(k < 10) var k_str = "0" + String(k);
            else       var k_str = String(k);
            if(data[i][k_str + "/11/14"]) new_val += parseFloat(data[i][k_str + "/11/14"]);
          }
          
          var data_reg = data[i].region;
          for (var j = 0; j < json.features.length; j++){
            var json_reg = json.features[j].properties.nom;
            if (data_reg == json_reg) {
              //On injecte la valeur de l'Etat dans le json
              json.features[j].properties.value = new_val;
              break;
            }
          }
        }
        
        svg.selectAll("path")
          .data(json.features)
          .enter()
          .append("path")
          .attr("d", path)
        	.attr("stroke", "black")
          .style("fill", function(d) {
            //on prend la valeur recupere plus haut
            var value = d.properties.value;
            if (value) {
              return color(value);
            } else {
              // si pas de valeur alors en gris
              return "#ccc";
            }
          })
          .on('mousemove', function(d) {
            	var mouse = d3.mouse(svg.node()).map(function(d) {
              	return parseInt(d);
            });
          	d3.select(this)
              .transition()
              .duration(50)
            	.attr("stroke", "black")
            	//.style("fill", "brown")
              .attr("stroke-width", 3)
            tooltip.classed('hidden', false)
              .attr('style', 'left:' + (mouse[0] + 15) +
                    'px; top:' + (mouse[1] - 35) + 'px')
              .html("Nom : " + d.properties.nom + "</br>Data : " + d.properties.value);
          })
          .on('mouseout', function() {
          	d3.select(this)
              .transition()
              .duration(300)
            	/*.style("fill", function(d) {
                //on prend la valeur recupere plus haut
                var value = d.properties.value;
                if (value) {
                  return color(value);
                } else {
                  // si pas de valeur alors en gris
                  return "#ccc";
                }
              })*/
            	.attr("stroke", "black")
              .attr("stroke-width", 1)
            tooltip.classed('hidden', true);
          });
      });
    });
    
  </script>
</body>

https://d3js.org/d3.v3.min.js