D3 + Leaflet v2

Demo of leaflet & D3 from Mike Bostock's tutorial, updated with an openstreetmap URL that works.

forked from pbogden's block: D3 + Leaflet

forked from brandonhaydu's block: D3 + Leaflet

forked from brandonhaydu's block: D3 + Leaflet v1

<!DOCTYPE html>
<meta charset="utf-8">
<title>leaflet</title>
<style>

@import url(//cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet.css);

#map {
  width: 960px;
  height: 500px;
}

path {
  fill: #000;
  fill-opacity: .2;
  stroke: #fff;
  stroke-width: 1.5px;
}

path:hover {
  fill: brown;
  fill-opacity: .7;
}

</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet.js"></script>
<body>
<div id="map"</div>
<script>
var osmUrl = 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
    osmAttrib = '&copy; <a href="https://openstreetmap.org/copyright">OpenStreetMap</a> contributors',
    osm = L.tileLayer(osmUrl, {maxZoom: 18, attribution: osmAttrib});

var map = L.map('map').setView([37.5, -115], 6).addLayer(osm);

var svgMap = d3.select(map.getPanes().overlayPane).append("svg"),
    g = svgMap.append("g").attr("class", "leaflet-zoom-hide");

var transform = d3.geo.transform({point: projectPoint}),
    path = d3.geo.path().projection(transform);

d3.json("counties.json", function(error, ca) {
  var features = ca.objects.CA.geometries.map(function(d) { return topojson.feature(ca, d); });
  var all = topojson.merge(ca, ca.objects.CA.geometries);

var states = g.selectAll("path")
      .data(features)
    .enter()
      .append("path");

map.on("viewreset", reset);
  reset();

// Reposition the SVG to cover the features.
  function reset() {
    var bounds = path.bounds(all),
        topLeft = bounds[0],
        bottomRight = bounds[1];

svgMap .attr("width", bottomRight[0] - topLeft[0])
        .attr("height", bottomRight[1] - topLeft[1])
        .style("left", topLeft[0] + "px")
        .style("top", topLeft[1] + "px");

g.attr("transform", "translate(" + -topLeft[0] + "," + -topLeft[1] + ")");

states.attr("d", path);
  }
});

// Use Leaflet to implement a D3 geometric transformation.
function projectPoint(x, y) {
  // Returns the map layer point that corresponds to the given geographical coordinates
  var point = map.latLngToLayerPoint(new L.LatLng(y, x));
  this.stream.point(point.x, point.y);
}
</script>

Modified http://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet.js to a secure url

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.js

https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.js

https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet.js