Ordering Feature Layers

Controlling the order of feature layers allows greater cartographic control over the rendering of layers beyond the normal tile / polygon / point ordering.
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <title>Ordering Feature Layers</title>
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />

  <!-- Load Leaflet from CDN -->
  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css"
    integrity="sha512-xodZBNTC5n17Xt2atTPuE1HxjVMSvLVW9ocqUKLsCC5CXdbqCmblAshOMAS6/keqq/sMZMZ19scR4PsZChSR7A=="
    crossorigin=""/>
  <script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"
    integrity="sha512-XQoYMqMTK8LvdxXYG3nZ448hOEQiglfqkJs1NOQV44cWnUrBc8PkAOcXy20w0vlaXaVUearIOBhiXZ5V3ynxwA=="
    crossorigin=""></script>

  <!-- Load Esri Leaflet from CDN -->
  <script src="https://unpkg.com/esri-leaflet@3.0.8/dist/esri-leaflet.js"
    integrity="sha512-E0DKVahIg0p1UHR2Kf9NX7x7TUewJb30mxkxEm2qOYTVJObgsAGpEol9F6iK6oefCbkJiA4/i6fnTHzM6H1kEA=="
    crossorigin=""></script>

  <!-- Load Esri Leaflet Vector from CDN -->
  <script src="https://unpkg.com/esri-leaflet-vector@3.1.2/dist/esri-leaflet-vector.js"
    integrity="sha512-SnA/TobYvMdLwGPv48bsO+9ROk7kqKu/tI9TelKQsDe+KZL0TUUWml56TZIMGcpHcVctpaU6Mz4bvboUQDuU3w=="
    crossorigin=""></script>

  <style>
    body { margin:0; padding:0; }
    #map { position: absolute; top:0; bottom:0; right:0; left:0; }
  </style>
</head>
<body>

<div id="map"></div>

<script>
  var map = L.map('map').setView([45.5384, -122.6695], 16);

  L.esri.Vector.vectorBasemapLayer('OSM:Standard', {
    apikey: apiKey // Replace with your API key - https://developers.arcgis.com
  }).addTo(map);

  var neighborhoodsUrl = 'https://www.portlandmaps.com/arcgis/rest/services/Public/Zoning/MapServer/32';
  var buildingFootprintsUrl = 'https://www.portlandmaps.com/arcgis/rest/services/Public/Basemap_Color_Buildings/MapServer/0';
  var blockPointsUrl = 'https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/0';

  // create a map pane for neighborhoods
  map.createPane('neighborhoods');

  // Define the created pane when creating the feature layer
  L.esri.featureLayer({
    url: neighborhoodsUrl,
    pane: 'neighborhoods'
  }).addTo(map);

  // Panes are added to the map in order - this pane will be sit on top of 'neighborhoods'
  map.createPane('footprints');

  L.esri.featureLayer({
    url: buildingFootprintsUrl,
    pane: 'footprints',
    style: function (feature) {
      return { color: 'white', weight: 0, fillOpacity: 1 };
    }
  }).addTo(map);

  map.createPane('blockpoints');

  // for point GeoJSON, Leafet expects custom panes to be returned in pointToLayer()
  L.esri.featureLayer({
    url: blockPointsUrl,
    pointToLayer: function (geojson, latlng) {
      return L.circleMarker(latlng, {
        pane: 'blockpoints',
        color: 'green'
      });
    }
  }).addTo(map);
</script>

</body>
</html>
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