Working with spatial data

Example #7

Simple mouse interaction with d3.js

forked from mbostock‘s block: U.S. Counties TopoJSON

forked from enjalot‘s block: WWSD #5: d3 + TopoJSON

forked from enjalot‘s block: WWSD #7: d3 mouse interaction

index.html

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

path {
  fill: #ccc;
  stroke: #fff;
  stroke-width: .5px;
}
  
circle {
  fill: #fff;
  fill-opacity: 0.4;
  stroke: #111;
}
  
path.active {
  fill: #ff7f7f;
}
  circle.active {
    fill: #f00;
  }


</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var projection = d3.geo.mercator();
  
var path = d3.geo.path()
  .projection(projection)

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var url = "//enjalot.github.io/wwsd/data/world/world-110m.geojson";
var url2 = "//enjalot.github.io/wwsd/data/world/ne_50m_populated_places_simple.geojson"
d3.json(url, function(error, countries) {
d3.json(url2, function(error, places) {
  if (error) throw error;
  
  console.log("geojson", countries, places);
 
  svg.selectAll("path")
    .data(countries.features)
  .enter().append("path")
    .attr("d", path)
  
  
  svg.selectAll("circle")
  .data(places.features)
  .enter().append("circle")
  .attr({
    r: 5,
    cx: function(d) { return projection(d.geometry.coordinates)[0]},
    cy: function(d) { return projection(d.geometry.coordinates)[1]}
  }).on("mouseover", function(d) {
    d3.select(this).attr("r",10);
    console.log(d);
  }).on("mouseout", function(d) {
    d3.select(this).attr("r",5);
    console.log(d);
  })
  
  
  
});
});

</script>