Query a feature layer (advanced)

In this sample, you can click on the map to query for features within 250 meters of where you clicked. For more explanation about querying features, visit the tutorial.

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<html>
  <head>
    <meta charset="utf-8" />
    <title>Query a feature layer (advanced)</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@3.1.3/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>
    <div id="map"></div>
    <script>
      const apiKey = "YOUR_API_KEY";

      const map = L.map("map").setView([34.19, -118.53], 16);

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

      const 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);

      let previousIds = [];

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

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

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

            previousIds = ids;

            for (let 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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