D3 Examples - thenmap api

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.state {
  fill: #d3d3d3;
  stroke: #f1f1f1;
  stroke-width: 1px;
}
​
svg {
  display: block;
  margin: auto;
  font: 14px sans-serif;
}
​
body {
  margin: 0;
}
​
svg, body {
  background: #f1f1f1;
}
​
</style>
<body>
  <select name="" id="">
    <option value="1780">1780</option>
    <option value="1800">1800</option>
    <option value="1820">1820</option>
    <option value="1850">1850</option>
    <option value="1865">1865</option>
    <option value="1880">1880</option>
    <option value="1900">1900</option>
    <option value="1930">1930</option>
  </select>
<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 projection = d3.geo.albersUsa()
    .scale(1000)
    .translate([width / 2, height / 2]);
​
var path = d3.geo.path()
    .projection(projection);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
function render(year) {
  d3.json("https://api.thenmap.net/v1/us4/geo|data/"+ year +"?data_props=sdate|edate|name&geo_type=topojson", function(error, us) {
    if (error) throw error;
​
    console.log(us)
​
    var statetopo = topojson.feature(us.geo, us.geo.objects.collection);
​
    var states = svg.selectAll('path')
      .data(statetopo.features, function(d) { return d.id; });
​
    states.transition()
      .duration(1000)
      .attr('d', path);
​
    states.enter()
      .append("path")
      .attr('class', 'state')
      .attr("d", path)
      .append('title')
      .text(function(d) { return d.id; });
​
    states.exit()
      .transition()
      .duration(1000)
      .attr('d', path)
      .remove();
  });
}
​
render(1780);
​
d3.select('select').on('change', function(d) {
  render(this.value);
})
​
</script>
​
    