<!-- Code from d3-graph-gallery.com -->
<!DOCTYPE html>
<meta charset="utf-8">
<!-- Load d3.js -->
<script src="http://d3js.org/d3.v4.js"></script>
<script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script>
<script src="https://d3js.org/d3-geo-projection.v2.min.js"></script>
<!-- Create an element where the map will take place -->
<svg id="my_dataviz" ></svg>
<script>
var width = window.innerWidth,
height = window.innerHeight,
centered,
clicked_point;
// The svg
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.attr("class", "map");
// Map and projection
var path = d3.geoPath();
var projection = d3.geoMercator()
.translate([width / 2.2, height / 1.5]);
// Data and color scale
var data = d3.map();
var colorScale = d3.scaleThreshold()
.domain([100000, 1000000, 10000000, 30000000, 100000000, 500000000])
.range(d3.schemeBlues[7]);
// Load external data and boot
d3.queue()
.defer(d3.json, "https://raw.githubusercontent.com/holtzy/D3-graph-gallery/master/DATA/world.geojson")
.defer(d3.csv, "https://raw.githubusercontent.com/holtzy/D3-graph-gallery/master/DATA/world_population.csv", function(d) { data.set(d.code, +d.pop); })
.await(ready);
function ready(error, topo) {
let mouseOver = function(d) {
d3.selectAll(".Country")
.transition()
.duration(200)
.style("opacity", .5)
d3.select(this)
.transition()
.duration(200)
.style("opacity", 1)
.style("stroke", "black")
let mouseLeave = function(d) {
d3.selectAll(".Country")
.transition()
.duration(200)
.style("opacity", .8)
d3.select(this)
.transition()
.duration(200)
.style("stroke", "transparent")
// Draw the map
svg.append("g")
.selectAll("path")
.data(topo.features)
.enter()
.append("path")
// draw each country
.attr("d", d3.geoPath()
.projection(projection)
)
// set the color of each country
.attr("fill", function (d) {
d.total = data.get(d.id) || 0;
return colorScale(d.total);
})
.style("stroke", "transparent")
.attr("class", function(d){ return "Country" } )
.style("opacity", .8)
.on("mouseover", mouseOver )
.on("mouseleave", mouseLeave )
</script>