Switch between basemap layers (Control.Layers)

Use Leaflet's Control.Layers control to switch between different base layers and to toggle overlays on or off.

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<html>
  <head>
    <meta charset="utf-8" />
    <title>Switch between basemap layers (Control.Layers)</title>
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no" />
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.8.0/dist/leaflet.css" crossorigin="" />
    <script src="https://unpkg.com/leaflet@1.8.0/dist/leaflet.js" crossorigin=""></script>

    <!-- Load Esri Leaflet from CDN -->
    <script src="https://unpkg.com/esri-leaflet@^3.0.8/dist/esri-leaflet.js"></script>

    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@3.1.1/dist/esri-leaflet-vector.js" crossorigin=""></script>
    <style>
      html,
      body,
      #map {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 14px;
        color: #323232;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      const apiKey = "YOUR_API_KEY";

      const gray = L.esri.Vector.vectorBasemapLayer("ArcGIS:LightGray", {
        apikey: apiKey
      });

      const states = L.esri.featureLayer({
        url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/3",
        style: function (feature) {
          return { color: "#bada55", weight: 2 };
        }
      });

      const map = L.map("map", {
        center: [39, -97.5],
        zoom: 4,
        layers: [gray, states]
      });

      const baseLayers = {
        Grayscale: gray,
        Newspaper: L.esri.Vector.vectorBasemapLayer("ArcGIS:Newspaper", {
          apikey: apiKey
        })
      };

      const overlays = {
        "U.S. States": states
      };

      // https://leafletjs.com/reference.html#control-layers
      L.control.layers(baseLayers, overlays).addTo(map);
    </script>
  </body>
</html>

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