D3 Examples - Loading Tile Layers in d3.carto.map

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<html xmlns="https://www.w3.org/1999/xhtml">
<head>
  <title>d3.carto.map - Multiple Tile Layers</title>
  <meta charset="utf-8" />
    <link type="text/css" rel="stylesheet" href="d3map.css" />
    <link type="text/css" rel="stylesheet" href="https://raw.githubusercontent.com/emeeks/d3-carto-map/master/examples/example.css" />
</head>
<style>
  html,body {
    height: 100%;
    width: 100%;
    margin: 0;
  }
​
  #map {
    height: 100%;
    width: 100%;
    position: absolute;
  }
​
.countryborders {
    fill: rgba(0,0,0,0);
    stroke-width: 1px;
    stroke: gray;
    cursor: pointer;
}
​
.roads {
    stroke: brown;
    stroke-width: 1px;
    fill: none;
}
</style>
<script>
  function makeSomeMaps() {
    map = d3.carto.map();
​
    d3.select("#map").call(map);
​
    map.centerOn([-0.1275,51.507],"latlong");
​
tileLayer1 = d3.carto.layer.tile();
    tileLayer1
    .path("examples.map-zgrqqx0w")
    .label("Terrain 1")
    .visibility(false);
​
tileLayer2 = d3.carto.layer.tile();
    tileLayer2
    .path("elijahmeeks.map-ktkeam22")
    .label("Terrain 2");
​
tileLayer3 = d3.carto.layer.tile();
    tileLayer3
    .path("examples.map-h67hf2ic")
    .label("Streets")
    .visibility(false);
​
    geojsonLayer = d3.carto.layer.geojson();
    geojsonLayer
    .path("https://bl.ocks.org/emeeks/raw/c970c9ee3e242e90004b/world.geojson")
    .label("GeoBorders")
    .visibility(false)
    .cssClass("countryborders")
    .renderMode("canvas");
    
    topojsonLayer = d3.carto.layer.topojson();
    topojsonLayer
    .path("https://bl.ocks.org/emeeks/raw/c970c9ee3e242e90004b/sample_routes.topojson")
    .label("TopoRoutes")
    .visibility(false)
    .cssClass("roads")
​
    .renderMode("canvas");
​
    map.addCartoLayer(tileLayer1);
    map.addCartoLayer(tileLayer2);
    map.addCartoLayer(tileLayer3);
    map.addCartoLayer(topojsonLayer);
    map.addCartoLayer(geojsonLayer);
​
  }
</script>
<body onload="makeSomeMaps()">
<div id="map"></div>
<footer>
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8" type="text/javascript"></script>
<script src="https://d3js.org/topojson.v1.min.js" type="text/javascript">
</script>
<script src="https://d3js.org/d3.geo.projection.v0.min.js" type="text/javascript">
</script>
<script src="tile.js" type="text/javascript">
</script>
<script src="d3.quadtiles.js" type="text/javascript">
</script>
<script src="d3.geo.raster.js" type="text/javascript">
</script>
<script src="https://cdn.jsdelivr.net/gh/emeeks/d3-carto-map/d3.carto.map.js" type="text/javascript">
</script>
</footer>
</body>
</html>
    