mapdata.js

   var EmergData = $.ajax({
            url: '/emergencies.json',
            dataType: 'text',
            success : function(data){
              var geojson;
              geojson = $.parseJSON(data);

               //Adding custom markers to maps
		            var EmergencyIcon = L.icon({
					    iconUrl: '<%= asset_path('emergency.png') %>',

					    iconSize:     [30, 60], // size of the icon
					    iconAnchor:   [22, 94], // point of the icon which will correspond to marker's location
					    shadowAnchor: [4, 62],  // the same for the shadow
					    popupAnchor:  [-3, -76] // point from which the popup should open relative to the iconAnchor
					});

					var Custom_marker = L.geoJSON(geojson, {
                       pointToLayer : function(feature,latlng){
                          L.marker(latlng, 
                          	{icon: EmergencyIcon
                          }).addTo(mymap).on('mouseover', function() {
			                                  this.bindPopup(feature.properties.name + '<br>' + feature.properties.description).openPopup();
			                               });
			           }
					});
               
            }
         });