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Using d3.carto.layer with d3.carto.map.

Each d3.carto.layer is defined and then added to the map using map.addCartoLayer. You can access the added layers using map.layers(). Each layer fires a “load” event once successfully added to the map.

index.html

<html xmlns="//www.w3.org/1999/xhtml">
<head>
  <title>d3.carto.map - d3.carto.layer</title>
  <meta charset="utf-8" />
    <link type="text/css" rel="stylesheet" href="https://raw.githubusercontent.com/emeeks/d3-carto-map/master/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;
  }

</style>
<script>
  function makeSomeMaps() {
    map = d3.carto.map();

    d3.select("#map").call(map);

    tileLayer = d3.carto.layer();
    tileLayer
    .type("tile")
    .path("examples.map-zgrqqx0w")
    .label("Base")
    .on("load", recenter);

    geojsonLayer = d3.carto.layer();
    
    geojsonLayer
    .type("geojson")
    .path("//bl.ocks.org/emeeks/raw/c970c9ee3e242e90004b/world.geojson")
    .label("GeoBorders")
    .cssClass("countryborders")
    .renderMode("canvas")
    .on("load", createFeatureLayer);
    
    topojsonLayer = d3.carto.layer();
    topojsonLayer
    .type("topojson")
    .path("//bl.ocks.org/emeeks/raw/c970c9ee3e242e90004b/sample_routes.topojson")
    .label("TopoRoutes")
    .cssClass("roads")
    .renderMode("canvas")
    .on("load", function() {console.log("load topojson")});

    csvLayer = d3.carto.layer();
    csvLayer
    .type("csv")
    .path("//bl.ocks.org/emeeks/raw/c970c9ee3e242e90004b/sample_points.csv")
    .label("CSV Points")
    .cssClass("pinkcircle")
    .renderMode("svg")
    .markerSize(3)
    .x("x")
    .y("y")
    .on("load", changeMarkers);

    xyLayer = d3.carto.layer();
    xyLayer
    .type("xyarray")
    .features([{x: 5, y: 40},{x: 5, y: 50}])
    .label("XY Array")
    .cssClass("greencircle")
    .renderMode("svg")
    .markerSize(30)
    .x("x")
    .y("y")
    .on("load", function(){console.log("load xyarray")});

    map.addCartoLayer(tileLayer);
    map.addCartoLayer(topojsonLayer);
    map.addCartoLayer(geojsonLayer);
    map.addCartoLayer(csvLayer);
    map.addCartoLayer(xyLayer);

    function recenter() {
      map.centerOn([-0.1275,51.507],"latlong",5000);
    }

    function changeMarkers() {
      d3.selectAll("g.pinkcircle").select("circle").remove();
      d3.selectAll("g.pinkcircle").datum({e: 0}).append("rect").attr("class", "bluesquare").attr("height", 5).attr("width",5).attr("x",-2.5).attr("y",-2.5)
//    To get the graphical elements to scale you need to do this
      map.refresh();
    }
    
    function createFeatureLayer() {
      var featuresArray = [];
      var mapLayers = map.layers();
      mapLayers.forEach(function (layer) {
        if (layer.label() == "GeoBorders") {
          featuresArray = layer.features();
        }
      })
     shortNameCountries = featuresArray.filter(function(d) {return d.properties.name.length < 7})

    featureLayer = d3.carto.layer();
    featureLayer
    .type("featurearray")
    .features(shortNameCountries)
    .label("Feature Array")
    .cssClass("halffilledcountries")
    .renderMode("svg")
    .on("load", function(){console.log("load featurearray")}); 
    
    map.addCartoLayer(featureLayer);

    }

  }
</script>
<body onload="makeSomeMaps()">
<div id="map"></div>
<footer>
<script src="https://rawgit.com/emeeks/d3-carto-map/master/resources/d3.v3.min.js" type="text/javascript"></script>
<script src="https://rawgit.com/emeeks/d3-carto-map/master/resources/topojson.js" type="text/javascript">
</script>
<script src="https://rawgit.com/emeeks/d3-carto-map/master/resources/d3.geo.projection.min.js" type="text/javascript">
</script>
<script src="https://rawgit.com/emeeks/d3-carto-map/master/resources/tile.js" type="text/javascript">
</script>
<script src="https://rawgit.com/emeeks/d3-carto-map/master/resources/d3.quadtiles.js" type="text/javascript">
</script>
<script src="https://rawgit.com/emeeks/d3-carto-map/master/resources/d3.geo.raster.js" type="text/javascript">
</script>
<script src="https://rawgit.com/emeeks/d3-carto-map/master/d3.carto.map.js" type="text/javascript">
</script>
</footer>
</body>
</html>