diff --git a/combo/apps/maps/static/js/combo.map.js b/combo/apps/maps/static/js/combo.map.js
index d1836fc9..6e58226e 100644
--- a/combo/apps/maps/static/js/combo.map.js
+++ b/combo/apps/maps/static/js/combo.map.js
@@ -129,7 +129,20 @@ $(function() {
           if (loading == 0) {
             $(cell).trigger('combo:map-markers-ready');
           }
-        }
+        },
+
+        each_marker: function(callback) {
+          // iterate over all markers, with context(this) being set to relative
+          // geojson_layer.
+          var layer_slugs = Object.keys(this.geojson_layers);
+          for (var i=0; i<layer_slugs.length; i++) {
+            var layer = this.geojson_layers[layer_slugs[i]];
+            if (layer.leaflet_layer) {
+              layer.leaflet_layer.eachLayer(callback, layer);
+            }
+          }
+        },
+
       });
 
     function render_map(cell) {