Google Maps v3: Enforcing min. zoom level when using fitBounds

Without trying it, I'd say you should be able to do it just by having fitBounds() before you get the zoom level, i.e.

map.fitBounds(bounds);
var zoom = map.getZoom();
map.setZoom(zoom > 6 ? 6 : zoom);

If you did try that and it didn't work, you can setup your map with minZoom in the MapOptions ^{(api-reference)} like this:

var map = new google.maps.Map(document.getElementById("map"), { minZoom: 6 });

This would keep the map from zooming any further out when using fitBounds().

At this discussion on Google Groups I discovered that basically when you do a fitBounds, the zoom happens asynchronously so you need to capture the zoom and bounds change event. The code in the final post worked for me with a small modification... as it stands it stops you zooming greater than 15 completely, so used the idea from the fourth post to have a flag set to only do it the first time.

// Do other stuff to set up map
var map = new google.maps.Map(mapElement, myOptions);
// This is needed to set the zoom after fitbounds, 
google.maps.event.addListener(map, 'zoom_changed', function() {
    zoomChangeBoundsListener = 
        google.maps.event.addListener(map, 'bounds_changed', function(event) {
            if (this.getZoom() > 15 && this.initialZoom == true) {
                // Change max/min zoom here
                this.setZoom(15);
                this.initialZoom = false;
            }
        google.maps.event.removeListener(zoomChangeBoundsListener);
    });
});
map.initialZoom = true;
map.fitBounds(bounds);

Hope that helps,

Anthony.