Question

I have the following code to open an infowindow when a specific marker is click and it open a window. Does anyone know how to close the previous infowindow when another one is clicked?.

   google.maps.event.addListener(marker, 'click', function() {
            infowindow.open(map1, marker);
        });

Answer 1

Just make sure you only create ONE infoWindow in the global scope, like this:

infoWindow = new google.maps.InfoWindow; //static infoWindow for all your markers
google.maps.event.addDomListener(window, 'load', function() {
   //create your markers here
   google.maps.event.addListener(marker, 'click', function() {
               infoWindow.open(map1, marker); //take care with case-sensitiveness
          });
});

UPDATE:

• Fix case sensitive spotted by Duncan.
• Illustrate the marker click handlers must be connected after marker creation, both inside page load event.