Where did you place this code? Is it in an mapZoom event handler
function? On the timeline? You have provided little context to help us
determine why your code isn't working.

My guess is that this is in an event handler. If so, your "overlay"
variable is probably null when you're at a zoomLevel that isn't 13. In
your if statement, you define overlay as a local variable. That means
the reference won't persist every time your code runs. You should save
it as a member variable in your class so that overlay is defined.
Note: if this is timeline code, then this answer probably won't be
relevant. Please give us more information about your code.

Thanks!

- Josh

On Mon, Oct 6, 2008 at 2:48 AM, bennettberlin <bennettberlin@...> wrote:
> Hi,
>
> I wish to show an overlay at zoom level 13 only. Please could somebody
> tell me what I'm doing wrong.
>
> Sequence:
> Intialize map at zoom level 14 - no overlay
> Zoom to level 13 - overlay appears
> Further zooming does not remove overlay
>
> Thanks,
>
> if (_yahooMap.zoomLevel == 13) {
>
> var latlon = new LatLon(Number(10.53), Number(104.34));
> var overlay:mapOverlay = new mapOverlay(latlon);
>
> _yahooMap.overlayManager.addOverlay(overlay);
> overlay.redraw();
> // overlay displays
>
> //_yahooMap.overlayManager.removeOverlay(overlay);
> // overlay removed
>
> } else {
> // Does not remove overlay
> _yahooMap.overlayManager.removeOverlay(overlay);
> }
>
>