Load each and every feature initially

Sometimes it is desirable to load a "snapshot" of a Feature Layer instead of loading it progressively as you pan around the map. The approach is useful for smaller services.

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <title>Load each and every feature initially</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([41.004, -77.618], 7);

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

  var statesUrl = 'https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/2';
  var citiesUrl = 'https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/0';

  // query a feature service for a state
  L.esri.query({
    url: statesUrl
  }).where("state_name='Pennsylvania'").run(function (error, states) {
    if (error) {
      return;
    }

    // draw state on the map
    var pennsylvania = L.geoJSON(states).addTo(map);

    // fit map to boundary
    map.fitBounds(pennsylvania.getBounds());

    // query all cities with a population greater than 30,000 (pop2000 > 30000) inside our boundary
    L.esri.query({
      url: citiesUrl
    }).where('pop2000 > 30000').within(pennsylvania).run(function (error, cities) {
      if (error) {
        return;
      }

      L.geoJSON(cities).addTo(map);
    });
  });
</script>

</body>
</html>

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