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Example of grouping counties by state
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| fill: none; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| } | |
| path.state { | |
| fill: none; | |
| stroke: black; | |
| stroke-width: .5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 600; | |
| var path = d3.geo.path() | |
| .projection(d3.geo.albersUsa()); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("counties_pa.json", function(error, us) { | |
| if (error) return console.error(error); | |
| var color = d3.scale.threshold() | |
| .domain([1, 10, 50, 100, 500, 1000, 2000, 5000]) | |
| .range(["#fff7ec", "#fee8c8", "#fdd49e", "#fdbb84", "#fc8d59", "#ef6548", "#d7301f", "#b30000", "#7f0000"]); | |
| svg.append('g') | |
| .attr('class','counties') | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.cb_2014_us_county_20m).features).enter() | |
| .append('path') | |
| .attr('d', path) | |
| .attr("id", function(d) { return "county-" + d.id; }) | |
| .attr("data-state", function(d) { return d.properties.state; }) | |
| .attr('style',function(d) { | |
| return 'fill:'+color(d.properties.population / d.properties.area * 2.58999e6); | |
| }) | |
| .on("mouseover", hoverCounty) | |
| .on("mouseout", outCounty); | |
| svg.append('g') | |
| .attr('class', 'states') | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.cb_2014_us_state_20m).features).enter() | |
| .append("path") | |
| .attr("class", "state") | |
| .attr("id", function(d) { return "state-" + d.id; }) | |
| .attr("d", path); | |
| }); | |
| function hoverCounty(county) { | |
| d3.selectAll("path[data-state='" + county.properties.state + "']").style("opacity", .5); | |
| } | |
| function outCounty(county) { | |
| d3.select(".counties").selectAll("path").style("opacity", null); | |
| } | |
| </script> |
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