afterInitMap trigger added.

js/ggl_map.js

@@ -116,6 +116,9 @@
       // The most important variable of all :)
       _self.map = new google.maps.Map(document.getElementById("ggl_map"), drupalSettings.gglMap.map);
 
+      // Trigger external JS after initializing the map.
+      $(window).trigger('gglMap:afterInitMap', {});
+
       // Bind dragend event to the map.
       _self.map.addListener('dragend', function () {
         _self.boundsChanged();