Editing feature layers

This sample demonstrates a bare-bones approach for passing edits to a feature service.
Click on the map to post an edit.
Click on a marker to remove it.
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <title>Editing feature layers</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>

<!-- Leaflet Draw -->
<style>
  #info-pane {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 400;
    padding: 1em;
    background: white;
    text-align: right;
    max-width: 250px;
  }

  #form {
    display: none;
  }
</style>

<div id="map"></div>
<div id="info-pane" class="leaflet-bar">
  <label>
    Click on the map to post an edit.<br>
    Click on a marker to remove it.
    <select id="symbols">
      <option value="Air Control Point">Air Control Point</option>
      <option value="Decision Point">Decision Point</option>
      <option value="Unmanned Aerial System (UAS UA)">Unmanned Aerial System (UAS UA)</option>
    </select>
  </label>
</div>

<script>
  // create the map
  var map = L.map('map').setView([65, -18.5], 6);

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

  // add our feature layer to the map
  const militaryOps = L.esri.featureLayer({
    url: 'https://sampleserver6.arcgisonline.com/arcgis/rest/services/Military/FeatureServer/3'
  }).addTo(map);

  var symbols = document.querySelector('#symbols');

  // when the map is clicked, add a new feature
  map.on('click', function (e) {
    // convert to GeoJSON
    const feat = L.marker(e.latlng).toGeoJSON();
    // set the attribute value that controls the feature service symbology
    feat.properties.symbolname = symbols.value;
    // make a request to add the new feature to the feature service.
    militaryOps.addFeature(feat, function (err, response) {
      if (err) {
        return;
      }

      console.log(response);
    });
  });

  // when a marker is clicked, remove the feature from the service, using its id
  militaryOps.on('click', function (e) {
    militaryOps.deleteFeature(e.layer.feature.id, function (err, response) {
      if (err) {
        return;
      }

      console.log(response);
    });
    // make sure map click event isn't fired.
    L.DomEvent.stopPropagation(e);
  });
</script>

</body>
</html>
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