D3 Examples - D3 UEM

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<!DOCTYPE html>
<style>
  
.nation {
  cursor: pointer;
  fill: #D3D3D3;
}
  
.nation :hover {
  fill: red;
}
​
.states {
  cursor: pointer;
  fill: #D3D3D3;
}
​
.counties {
  cursor: pointer;
  fill: #D3D3D3;
}
  
.counties :hover {
  fill: red;
}
​
.states :hover {
  fill: red;
}
​
.state-borders {
  fill: none;
    stroke: #fff;
    stroke-width: 1.5px;
    stroke-linejoin: round;
    stroke-linecap: round;
    pointer-events: none;
}
​
</style>
<body>
  <form>
      <input id="states" type="radio" name="level" val="states" onclick="drawMap();" checked="checked">States</input>
  
      <input id="counties" type="radio" name="level" val="counties" onclick="drawMap();">Counties</input>
      <input id="us_map" type="radio" name="level" val="districts" onclick="drawMap();">US Map</input>
  </form>
</body>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/topojson.v2.min.js"></script>
<script>
  
var svg = d3.select("svg");
​
var path = d3.geoPath();
​
window.onload = function () { drawMap(); }
​
function drawMap() {
  if (document.getElementById("states").checked == true) {
        drawStates();
  } else if (document.getElementById("counties").checked == true) {
    drawCounties();
  } else {
    drawNation();
  }
}
  
function drawStates() {
  d3.json("https://d3js.org/us-10m.v1.json", function(error, us) {
     if (error) throw error;
  
     svg.append("g")
      .attr("class", "states")
      .selectAll("path")
      .data(topojson.feature(us, us.objects.states).features)
      .enter().append("path")
      .attr("d", path)
      .on("click", clicked);
​
     svg.append("path")
      .attr("class", "state-borders")
      .attr("d", path(topojson.mesh(us, us.objects.states, function(a, b) { return a    !== b; })));
   });
}
  
function drawCounties() {
  d3.json("https://d3js.org/us-10m.v1.json", function(error, us) {
     if (error) throw error;
​
     svg.append("g")
      .attr("class", "counties")
      .selectAll("path")
      .data(topojson.feature(us, us.objects.counties).features)
      .enter().append("path")
      .attr("d", path);
​
     svg.append("path")
      .attr("class", "state-borders")
      .attr("d", path(topojson.mesh(us, us.objects.counties, function(a, b) { return a !== b; })));
   });
}
  
function drawNation() {
  d3.json("https://d3js.org/us-10m.v1.json", function(error, us) {
     if (error) throw error;
​
     svg.append("g")
      .attr("class", "nation")
      .selectAll("path")
      .data(topojson.feature(us, us.objects.nation).features)
      .enter().append("path")
      .attr("d", path);
   });
}
  
function clicked(d) {
  var x, y, k;
​
  if (d && centered !== d) {
    var centroid = path.centroid(d);
    x = centroid[0];
    y = centroid[1];
    k = 4;
    centered = d;
  } else {
    x = width / 2;
    y = height / 2;
    k = 1;
    centered = null;
  }
​
  g.selectAll("path")
      .classed("active", centered && function(d) { return d === centered; });
​
  g.transition()
      .duration(750)
      .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")scale(" + k + ")translate(" + -x + "," + -y + ")")
      .style("stroke-width", 1.5 / k + "px");
}
​
</script>
​
    