js1568

/*
You'll need something like this in your HTML:
<script src="http://d3js.org/topojson.v1.min.js"></script>
*/

L.TopoJSON = L.GeoJSON.extend({
  addData: function(jsonData) {    
    if (jsonData.type === "Topology") {
      for (key in jsonData.objects) {
        geojson = topojson.feature(jsonData, jsonData.objects[key]);

js1568

L.GeoJSON.include({
  setOptions: function(opts) {
    //save original json data
    this._data = this._data || this.toGeoJSON();

    //destory layer group
    this.clearLayers();
    L.setOptions(this, opts);

    //recreate layer group

js1568

L.GeoJSON.include({
  identify: function(latlng) {
    var features = new L.FeatureGroup(),
      geopoint = {
        type: 'Point',
        coordinates: [latlng.lng, latlng.lat]
      };
    this.eachLayer(function (layer) {
      if (gju.pointInPolygon(geopoint, layer.feature.geometry)) {
        features.addLayer(layer);