A demo of TopoJSON on a U.S. counties shapefile from the U.S. census bureau. The same TopoJSON file can also be used to show states.
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U.S. Counties TopoJSON
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| fill: #ccc; | |
| stroke: #fff; | |
| stroke-width: .5px; | |
| } | |
| path:hover { | |
| fill: red; | |
| } | |
| </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 = 500; | |
| var path = d3.geo.path(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("/mbostock/raw/4090846/us.json", function(error, topology) { | |
| svg.selectAll("path") | |
| .data(topojson.feature(topology, topology.objects.states).features) | |
| .enter().append("path") | |
| .attr("d", path); | |
| }); | |
| </script> |
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