Query a feature layer

You can use a SQL query to return selected features from a feature layer. For more explanation, visit the tutorial.

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<html>
  <head>
    <meta charset="utf-8" />
    <title>Query a feature layer</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 Renderers from CDN -->
    <script src="https://unpkg.com/esri-leaflet-renderers@3.0.0" crossorigin=""></script>
    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@3.1.3/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>
    <style>
      #query {
        position: absolute;
        top: 10px;
        right: 10px;
        z-index: 1000;
        background: white;
        padding: 1em;
      }

      #query select {
        font-size: 16px;
      }
    </style>
    <div id="map"></div>
    <div id="query" class="leaflet-bar">
      <label>
        Zoning District:
        <select id="district">
          <!-- make sure to encase string values in single quotes for valid sql -->
          <option value="1=1">Any</option>
          <option value="ZONE_SMRY='OPEN SPACE'">Open Space</option>
          <option value="ZONE_SMRY='AGRICULTURE'">Agriculture</option>
          <option value="ZONE_SMRY='RESIDENTIAL'">Residential</option>
          <option value="ZONE_SMRY='COMMERCIAL'">Commercial</option>
          <option value="ZONE_SMRY='INDUSTRIAL'">Industrial</option>
          <option value="ZONE_SMRY='PARKING'">Parking</option>
          <option value="ZONE_SMRY='PUBLIC FACILITY'">Public Facility</option>
        </select>
      </label>
    </div>
    <script>
      const apiKey = "YOUR_API_KEY";

      const map = L.map("map").setView([34.19, -118.53], 15);

      L.esri.Vector.vectorBasemapLayer("OSM:LightGray", {
        apikey: apiKey
      }).addTo(map);

      const zoning = L.esri
        .featureLayer({
          url: "https://services5.arcgis.com/7nsPwEMP38bSkCjy/arcgis/rest/services/TEST_PYTHON_ZONING/FeatureServer/0",
          simplifyFactor: 0.5,
          precision: 4
        })
        .addTo(map);

      const zoningDistrict = document.getElementById("district");

      zoningDistrict.addEventListener("change", function () {
        zoning.setWhere(zoningDistrict.value);
      });
    </script>
  </body>
</html>

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