Querying features

Configuring a query to filter features on a L.esri.FeatureLayer. More information about Feature Layers can be found in the L.esri.FeatureLayer documentation.
Zoning District:
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <title>Querying features</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@4.0.0/dist/esri-leaflet-vector.js"
    integrity="sha512-EMt/tpooNkBOxxQy2SOE1HgzWbg9u1gI6mT23Wl0eBWTwN9nuaPtLAaX9irNocMrHf0XhRzT8B0vXQ/bzD0I0w=="
    crossorigin=""></script>

  <!-- Load Esri Leaflet Renderers plugin to use feature service symbology -->
  <script src="https://unpkg.com/esri-leaflet-renderers@3.0.0" 
    integrity="sha512-tqY7QUz7UHKLqhBX1SVYBsn6EKeadkSqYXsdj3RbzZdY8jUq1t0Hi+CS7vylbMIM/jcmN4PgelBhiKvCjTJ7GQ=="
    crossorigin=""></script>

  <style>
    body { margin:0; padding:0; }
    #map { position: absolute; top:0; bottom:0; right:0; left:0; }
  </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>
  var map = L.map('map').setView([34.19, -118.53], 15);

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

  var 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);

  var zoningDistrict = document.getElementById('district');

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

</body>
</html>
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