Esri Leaflet
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Query without a map

It is not necessary to add a layer to a map in order to execute a spatial query. More information about Queries can be found in the L.esri.Query documentation.

<!DOCTYPE html>
  <meta charset="utf-8" />
  <title>Query without a map</title>
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />

  <!-- Load Leaflet from CDN -->
  <link rel="stylesheet" href=""
  <script src=""

  <!-- Load Esri Leaflet from CDN -->
  <script src=""

    body { margin:0; padding:0; }
    #map { position: absolute; top:0; bottom:0; right:0; left:0; }

  #message {
    margin: 10px

<div id="map">
  <div id="message">computing...</div>
<div id="invisibleMap"></div>

  // html5 geolocation requires a secure connection
  if ( === '' && window.location.protocol !== 'https:') {
    window.location.protocol = 'https';

  document.getElementById('map').style.height = '100px';

  var message = document.getElementById('message');

  // its not necessary to instaniate a map in order to execute a spatial query,
  //  we do it here because it provides a convenient way to ask the user for their HTML5 location
  var map ='invisibleMap');

  map.on('locationfound', function (e) {
    // use location to find out which census block they are inside
      url: ''
    }).intersects(e.latlng).run(function (error, censusBlocks) {
      if (error) {
        message.innerHTML =
          'there may have been an error querying your location';


      if (censusBlocks.features.length > 0) {
      // if we find a match dig into the feature attributes to retrive median age
        message.innerHTML =
          'the median age of the census block where you are currently located is <b>' + censusBlocks.features[0].properties.MED_AGE +
          '</b> years old';
      } else {
      // otherwise, fail gracefully
        message.innerHTML =
          'either you aren\'t currently in the United States or you prefer not to say';