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index.html
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<!-- A choropleth example by Mike Bostock. Originally from http://bl.ocks.org/mbostock/4060606 -->
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.counties {
fill: none;
}
.states {
fill: none;
stroke: #fff;
stroke-linejoin: round;
}
.q0-9 { fill:rgb(247,251,255); }
.q1-9 { fill:rgb(222,235,247); }
.q2-9 { fill:rgb(198,219,239); }
.q3-9 { fill:rgb(158,202,225); }
.q4-9 { fill:rgb(107,174,214); }
.q5-9 { fill:rgb(66,146,198); }
.q6-9 { fill:rgb(33,113,181); }
.q7-9 { fill:rgb(8,81,156); }
.q8-9 { fill:rgb(8,48,107); }
</style>
<body>
Acknowledgement: This "Choropleth" example is originally from Mike Bostock's work at http://bl.ocks.org/mbostock/4060606.
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/queue-async/1.0.7/queue.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script>
<script>
var width = 960,
height = 500;
var rateById = d3.map();
var quantize = d3.scale.quantize()
.domain([0, .15])
.range(d3.range(9).map(function(i) { return "q" + i + "-9"; }));
var path = d3.geo.path();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
queue()
.defer(d3.json, "us.json")
.defer(d3.tsv, "unemployment.tsv", function(d) { rateById.set(d.id, +d.rate); })
.await(ready);
function ready(error, us) {
svg.append("g")
.attr("class", "counties")
.selectAll("path")
.data(topojson.feature(us, us.objects.counties).features)
.enter().append("path")
.attr("class", function(d) { return quantize(rateById.get(d.id)); })
.attr("d", path);
svg.append("path")
.datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))
.attr("class", "states")
.attr("d", path);
}
</script>