Esri Leaflet

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.

  <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';

  // 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 we find a match dig into the feature attributes to retrive median age
        if (censusBlocks.features.length > 0) {
          document.getElementById('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';
        // otherwise, fail gracefully
        else {
          document.getElementById('message').innerHTML =
            'either you arent currently in the United States or you prefer not to say.';