D3 Examples - Oklahoma Counties

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.county {
  fill: #eee;
}
​
.county:hover {
  fill: orange;
}
​
.county-border {
  fill: none;
  stroke: #777;
}
​
.state-border {
  fill: none;
  stroke: #333;
}
​
svg {
  display: block;
  margin: auto;
}
​
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
​
var width = 960,
    height = 500;
​
var path = d3.geo.path()
    .projection(null);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
d3.json("ok-counties.json", function(error, ok) {
  if (error) throw error;
​
  var counties = topojson.feature(ok, ok.objects.counties);
​
  svg.append("g")
      .attr("class", "counties")
    .selectAll("path")
      .data(counties.features)
    .enter().append("path")
      .attr('class', 'county')
      .attr("d", path);
​
  svg.append("path")
      .datum(topojson.mesh(ok, ok.objects.counties, function(a, b) { return a !== b; }))
      .attr("class", "county-border")
      .attr("d", path);
​
  svg.append("path")
      .datum(topojson.mesh(ok, ok.objects.counties, function(a, b) { return a === b; }))
      .attr("class", "state-border")
      .attr("d", path);
});
​
</script>
​
    