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              <!-- loading screen -->
<div id="back-cover">
   <h1>Map Loading ...</h1>
   <i class="fa fa-circle-o-notch fa-spin fa-3x"></i>   
</div>
<!-- container for map -->
<div id="map"></div>
<!-- error message modal -->
<div class="modal fade" id="layerErrorModal" tabindex="-1" role="dialog" aria-labelledby="layerErrorModal" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
        <h4 class="modal-title" id="myModalLabel">Error Adding Layers</h4>
      </div>
      <div id="erMsg" class="modal-body">
         <h4 class="text-danger">Warning: Some layers may not appear on map!</h4>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>        
      </div>
    </div>
  </div>
</div>
            
          
!
            
              html,
body,
#map {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

/* loading screen */
#back-cover {
    background: rgba(191, 191, 191, 1);
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    display: -webkit-box;   
    display: -moz-box;      
    display: -ms-flexbox;   
    display: -webkit-flex;  
    display: flex;    
    -webkit-box-orient: vertical;
    -moz-box-orient: vertical;
    -ms-flex-direction: column;
    -webkit-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center; 
    -moz-box-align: center; 
    -ms-flex-align: center; 
    -webkit-align-items: center;
    align-items: center;
    -webkit-box-pack: center; 
    -moz-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;    
    color: #222;
    z-index: 1500;
}

#back-cover h1 {
    font-weight: bold;
    font-size: 1.75em;
}

/* error message modal */
#layerErrorModal {
   display: none;
   z-index: 2000;
}

.modal-content {
   width: 900px;
   max-width: 100%;
   word-wrap: break-word;
   padding: 15px;
}
            
          
!
            
              'use strict';

// Create Map object
var map = L.map('map', {
   center: [40.15, -77.25],
   zoom: 10,               
});

// Set base map to Open Street Map and add to map 
var osm = L.tileLayer('//{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    attribution: '&#169; <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, CC BY-SA license'
}).addTo(map);

// Create objects for map services, but don't add to map
// Documentation states that you must add the event listener before adding layer to map
// See https://esri.github.io/esri-leaflet/api-reference/events.html#load-event
// Hiking Trails - Dynamic Map Layer
var trails = L.esri.dynamicMapLayer({
   // url for service
   url: '//gis.ccpa.net/arcgiswebadaptor/rest/services/ArcGIS_Online/LandTrailsData/MapServer',
   // bad URL to invoke error message
   //url: '//gis.ccpa.net/arcgiswebadaptor/rest/services/ArcGIS_Online/LandTrailsDataZ/MapServer',
   // optional attribution for source of data
   attribution: 'Cumberland County',
   // a property I added to store boolean for whether layer has loaded or not
   // used to remove loading screen
   isLoaded: false
});

// Municipal Compost Sites - Feature Layer
var compostSites = L.esri.featureLayer({
   // url for service; don't forget number at the end
   url: '//gis.ccpa.net/arcgiswebadaptor/rest/services/ArcGIS_Online/RecycleDisposalServices/MapServer/0',
   // bad URL to invoke error message
   //url: '//gis.ccpa.net/arcgiswebadaptor/rest/services/ArcGIS_Online/RecycleDisposalServices/MapServer/15',
   // a property I added to store boolean for whether layer has loaded or not
   // used to remove loading screen
   isLoaded: false
});

// function to handle load event for map services
// pass in map service object and access properties
// service parameter is map/feature service object
function processLoadEvent(service) {
   // service load event
   service.on('requestsuccess', function(e) {
      console.log('The map service ' + service.options.url + ' has been added to the map');
      // set isLoaded property to true
      service.options.isLoaded = true;      
   });   
  
   // request error event
   service.on('requesterror', function(e) {      
      // if the error url matches the url for the map service, display error messages
      // without this logic, various urls related to the service appear
      if (e.url == service.options.url) {
         // add messages to console
         console.log('There was an error adding ' + e.url + 'to the map');
         console.log('Error code:' + e.code + '; Message: ' + e.message); 
         // set isLoaded property to false
         service.options.isLoaded = false;  
                              
         // add messages to modal window
         var erMsgContent = '<p>There was an error adding ' + e.url + ' to the map</p>';
         erMsgContent += '<p>Error code:' + e.code + '; Message: ' + e.message + '</p>';
      
         // add error message to modal window
         $('#erMsg').append(erMsgContent);      
      
         // show modal window
         $('#layerErrorModal').modal('show'); 
      }
   });
}

// Call function to process load/error events
// Trails
processLoadEvent(trails);
// Compost Sites
processLoadEvent(compostSites);
   
// Add layers to map
trails.addTo(map);
compostSites.addTo(map);

// Function will remove loading screen once layers are added to map 
// loading screen element
var $backCover = $('#back-cover');
// display style property
var $backCoverDisplay = $backCover.css('display');

// test if isLoaded property for both layers is true every 2 seconds
// if it is true for both layers, remove loading screen and remove interval
var loadScreenTimer = window.setInterval(function() {
   // isLoaded property
   var trailsLoaded = trails.options.isLoaded;
   var compostSitesLoaded = compostSites.options.isLoaded;
   
   if (trailsLoaded && compostSitesLoaded) {
      // remove loading screen after 3 seconds
      window.setTimeout(function() {
            $backCover.fadeOut('slow');
      }, 3000); 
      
      // clear timer
      window.clearInterval(loadScreenTimer);       
   }   
}, 2000);
   
// Remove loading screen when warning modal is closed
$('#layerErrorModal').on('hide.bs.modal', function(e) {
   // remove loading screen
   $('#back-cover').fadeOut('slow');
   // clear timer
   window.clearInterval(loadScreenTimer);     
});
            
          
!
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