kozer / leaflet-tilelayer-geojson

Leaflet TileLayer for GeoJSON tiles

Leaflet GeoJSON Tile Layer

Renders GeoJSON tiles on an L.GeoJSON layer.

Docs

Usage example

The following example shows how to render a GeoJSON Tile Layer for US road line GeoJSON tiles (borrowed from http://openstreetmap.us/~migurski/vector-datasource/). See demo.

    var style = {
        "clickable": true,
        "color": "#00D",
        "fillColor": "#00D",
        "weight": 1.0,
        "opacity": 0.3,
        "fillOpacity": 0.2
    };
    var hoverStyle = {
        "fillOpacity": 0.5
    };

    var geojsonURL = 'http://polymaps.appspot.com/state/{z}/{x}/{y}.json';
    var geojsonTileLayer = new L.TileLayer.GeoJSON(geojsonURL, {
            clipTiles: true,
            unique: function (feature) {
                return feature.id; 
            }
        }, {
            style: style,
            onEachFeature: function (feature, layer) {
                if (feature.properties) {
                    var popupString = '<div class="popup">';
                    for (var k in feature.properties) {
                        var v = feature.properties[k];
                        popupString += k + ': ' + v + '<br />';
                    }
                    popupString += '</div>';
                    layer.bindPopup(popupString);
                }
                if (!(layer instanceof L.Point)) {
                    layer.on('mouseover', function () {
                        layer.setStyle(hoverStyle);
                    });
                    layer.on('mouseout', function () {
                        layer.setStyle(style);
                    });
                }
            }
        }
    );
    map.addLayer(geojsonTileLayer);

Constructor

L.TileLayer.GeoJSON( <String> urlTemplate, <GeoJSONTileLayer options> options?, <GeoJSON options> geojsonOptions? )

URL Template

A string of the following form, that returns valid GeoJSON.

'http://{s}.somedomain.com/blabla/{z}/{x}/{y}.json'

GeoJSONTileLayer options

• clipTiles (boolean) (default = false): If true, clips tile feature geometries to their tile boundaries using SVG clipping.
• unique (function): If set, the feature's are grouped into GeometryCollection GeoJSON objects. Each group is defined by the key returned by this function, with the feature object as the first argument.

GeoJSON options

Options that will be passed to the resulting L.GeoJSON layer: http://leafletjs.com/reference.html#geojson-options

Contributors

Thanks to the following people who contributed:

• Nelson Minar
• Alex Barth
• Pawel Paprota
• Mick Thompson