Zoom to specific level when specific basemap button clicked

philippschnetzer

I am using Robert's enhanced basemap switcher.  I am including the Esri Navigational Charts basemap in an application but it is only visible at 1:577000 and out.  How can I make the app automatically zoom to 1:577000 when that button is clicked.  It would just confuse a user if they are zoomed in to 1:10000 and click that basemap and nothing happens...

Thanks!

RobertScheitlin__GISP

Phillip,

  Here is the updated function:

            private function basemapButtonBar_changeHandler(event:IndexChangeEvent):void             {                 var layers:ArrayCollection = map.layers as ArrayCollection;                 basemapButtonBar.fader.value = event.newIndex + 1;                 for (var x:int = 0; x < basemapList.length; x++){                     var basemapLabel:String = basemapList.getItemAt(x).label;                     for each (var layer:Layer in layers){                         if(basemapList.getItemAt(event.newIndex).label != basemapLabel)                             if(layer.id == basemapLabel)                                 layer.visible = false;                         if(layer.id == basemapLabel)                             layer.alpha = 1;                     }                 }                 if(basemapList.getItemAt(event.newIndex).label == "Esri Nav. Charts" && map.scale < 577790.554289)                     map.scale = 577791;                 AppEvent.dispatch(AppEvent.BASEMAP_SWITCH, basemapList.getItemAt(event.newIndex).id);             }