Identifying Features

Identifying features on a Dynamic Map Layer on click by querying the service. Click a feature to identify it. More information about Map Services can be found in the L.esri.DynamicMapLayer documentation.

Click on the map for county info (sublayer 3)

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <title>Identifying 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>

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

<style>
  #selectedFeatures {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 1000;
    background: white;
    padding: 1em;
  }
  .leaflet-bar.map-text a {
    color: #79BD8F;
    display: inline;
  }
</style>

<div id="map"></div>
<div id="selectedFeatures" class="leaflet-bar map-text">
  Click on the map for <a href="https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer">county info (sublayer 3)</a>
</div>

<script>
  var map = L.map('map', {
    minZoom: 5
  }).setView([38.5, -96.8], 6);

  var usaDynamicLayer = L.esri.dynamicMapLayer({
    url: 'https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer',
    opacity: 1
  }).addTo(map);

  var identifiedFeature;
  var pane = document.getElementById('selectedFeatures');

  map.on('click', function (e) {
    pane.innerHTML = 'Loading';
    if (identifiedFeature) {
      map.removeLayer(identifiedFeature);
    }
    usaDynamicLayer
      .identify()
      .layers('visible:3') // just the counties sublayer
      .on(map)
      .at(e.latlng)
      .run(function (error, featureCollection) {
        if (error) {
          return;
        }

        // make sure at least one feature was identified.
        if (featureCollection.features.length > 0) {
          identifiedFeature = L.geoJSON(featureCollection.features[0]).addTo(map);
          var soilDescription =
            featureCollection.features[0].properties.NAME +
            ' County, ' +
            featureCollection.features[0].properties.STATE_NAME;
          pane.innerHTML = soilDescription;
        } else {
          pane.innerHTML = 'No features identified.';
        }
      });
  });
</script>

</body>
</html>

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