Querying features

Performing advanced queries on a Feature Layer. Click on the map to query for features within 250 meters. More information about Feature Layers can be found in the L.esri.FeatureLayer documentation.

<!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>

  <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([34.19, -118.53], 16);

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

  var streetLights = L.esri.featureLayer({
    url: 'https://maps.lacity.org/lahub/rest/services/Bureau_of_Street_Lighting/MapServer/0',
    pointToLayer: function (geojson, latlng) {
      return L.circleMarker(latlng);
    },
    style: {
      color: '#5B7CBA',
      weight: 2,
      opacity: 0.85,
      fillOpacity: 0.5
    }
  }).addTo(map);

  var previousIds = [];

  map.on('click', function (e) {
    streetLights.query().nearby(e.latlng, 250).ids(function (error, ids) {
      if (error) {
        return;
      }

      for (var j = 0; j < previousIds.length; j++) {
        streetLights.resetStyle(previousIds[j]);
      }

      if (!ids) {
        previousIds = [];
        return;
      }

      previousIds = ids;

      for (var i = 0; i < ids.length; i++) {
        streetLights.setFeatureStyle(ids[i], {
          color: '#BA454E',
          weight: 2,
          opacity: 0.85,
          fillOpacity: 0.5
        });
      }
    });
  });
</script>

</body>
</html>

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