D3 Examples - Heart Disease 1999-2016

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<!DOCTYPE html>
<meta charset="utf-8">
​
<style type="text/css">
​
  body {
    font-family: "Helvetica Neue", Helvetica, sans-serif;;
    font-size: 16px;
    width: 960px;
    height: 500px;
    margin: 20px auto;
  }
  .states {
    stroke: #fff;
    fill: none;
    pointer-events: none;
  }
  .counties {
    stroke: #fff;
    fill: none;
    stroke-width: .3px;
  }
 .tooltip {   
    position: absolute;           
    text-align: left;           
    padding: 5px;             
    font: 12px sans-serif;        
    background: white;
  opacity: 0.9;
    border: 0px;      
    border-radius: 8px;           
    pointer-events: none;         
}
  .tooltip h3 {
    margin: 0px 0px 8px;
  }
</style>
​
<body>
​
</body>
<center>
  <b>Heart Disease mortality</b><br>
  1999-2016
<script src="https://d3js.org/d3.v4.js" charset="utf-8"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
​
<script type="text/javascript">
  
var width = 960,
    height = 500;
​
var color = d3.scaleThreshold()
  .range(["#fff5f0","#fee0d2","#fcbba1","#fc9272","#fb6a4a","#ef3b2c","#cb181d","#a50f15","#67000d"])
    .domain([0,100,200,300,400,500]);
var radius = d3.scaleSqrt()
    .range([0,20])
    .domain([0,10000]);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
var tooltip = d3.select("body")
    .append("div")
    .attr("class", "tooltip")
    .style("position", "absolute")
    .style("z-index", "10")
    .style("visibility", "hidden");
​
d3.queue()
    .defer(d3.csv, "HeartDisease1999-2016.csv")
    .defer(d3.json, "us.json")
    .await(ready);
​
function ready(error, deaths, us) {
  if (error) return console.warn(error);
​
  deathsByFips = {};
  deaths.forEach(function(d) {
    d.Deaths = +d.Deaths;
    d.Population = +d.Population;
    d["Crude Rate"] = +(d["Crude Rate"].replace(" (Unreliable)", ""));
    deathsByFips[+d["County Code"]] = d;
  });
​
  var format = d3.format(".2%");
  var commas = d3.format(",");
​
  var path = d3.geoPath()
    .projection(d3.geoAlbersUsa());
​
  var subset = topojson.feature(us, us.objects.counties).features.filter(function(d) {
    return d.id in deathsByFips;
  });
​
  svg.append("g")
      .attr("class", "counties")
    .selectAll("path")
      .data(subset)
    .enter().append("path")
      .attr("d", path)
      .style("fill", function(d) { 
        return color(deathsByFips[d.id]["Crude Rate"]);
      })
      .on("mouseover", function(d) {
        var val = deathsByFips[d.id];
        var fill_color = color(val["Crude Rate"]);
        tooltip.html("");
        tooltip.style("visibility", "visible")
          .style("border", "3px solid " + fill_color);
​
        tooltip.append("h3").text(val.County);
        tooltip.append("div")
          .text("Population: " + commas(val["Population"]));
        tooltip.append("div")
          .text("Deaths per 100,000: " +(val["Crude Rate"]));
​
        d3.selectAll(".counties path")
          .style("opacity", 1)
           .style("stroke", null);
        d3.select(this)
          .style("opacity", 1)
          .style("stroke", "#222")
          .raise();
      })
      .on("mousemove", function() {
        return tooltip.style("top", (d3.event.pageY-52) + "px").style("left", (d3.event.pageX+18) + "px");
      })
      .on("mouseout", function() {
        tooltip.style("visibility", "hidden")
        d3.selectAll(".counties path")
          .style("opacity", 5);
        d3.selectAll(".states")
          .style("opacity", 5);
      });
​
  svg.append("path")
      .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a.id !== b.id; }))
      .attr("class", "states")
      .attr("d", path);
​
  svg.append("text")
    .style("font-weight", "bold")
    .attr("x", width - 176)
    .attr("y", height - 152)
    .text("Deaths per 100,000");
​
  var legend = svg.selectAll(".legend")
    .data(color.domain().reverse())
    .enter().append("g")
    .attr("transform", function(d,i) {
      return "translate(" + (width-170) + "," + (height - 144 + 16 * i) + ")";
    })
​
  legend.append("rect")
    .attr("width", 12)
    .attr("height", 12)
    .style("fill", function(d) {
      return color(d);
    });
​
  legend.append("text")
    .attr("x", 16)
    .attr("y", 11)
    .style("font-size", "12px")
    .text(function(d) {
      return d.toFixed(0);
    });
}
​
</script>
    