gmaps.js

// Scenario 1

// run these sequentially, the google map closes
google.maps.event.addDomListener(window, 'load', initialize);
google.maps.event.clearInstanceListeners(window, 'load');

// Scenario 2
function run() {
    google.maps.event.clearInstanceListeners(window, 'load');
}

google.maps.event.addDomListener(window, 'load', initialize);
// open the window and then in the console run:
run();
#=> undefined
// but in this case the map doesn't disapear