How to know which layers are currently visible

EzequiasRodrigues_da_Rocha — Fri, 25 Apr 2014 17:52:02 GMT

Hi

I am wondering if it is possible to retrieve the current information of visible layers.

I have found many samples but all relating to what is defined on the map service.

My idea is to retrieve with layers are checked as visible at a certain moment in the application.

I tried lately to add a event listener but I didn't have any success.

AppEvent.addListener(AppEvent.MAP_LAYER_VISIBLE, mapLayerVisibleHandler);

Regards
Ezequias Rocha

Re: How to know which layers are currently visible

EzequiasRodrigues_da_Rocha — Thu, 08 May 2014 14:33:21 GMT

Solution

private var _displayLayers:ArrayCollection = new ArrayCollection();

private function loadConfig():void{
_displayLayers.removeAll();
_displayLayers.addAll(getVisibleLayers());
----

private function getVisibleLayers():ArrayCollection
{
   var layers:ArrayCollection = new ArrayCollection();
   var mapServices:Array = getServices();

   var tempLayer:Object;
for each(var mapService:ArcGISDynamicMapServiceLayer in mapServices)
{
   if (mapService is ArcGISDynamicMapServiceLayer)
    if (mapService && mapService.visible)
    {
     if (mapService.visibleLayers)
     {
      for(var i:int = 0; i < mapService.visibleLayers.length; i++)
      {              tempLayer = new Object();
       tempLayer.index = mapService.visibleLayers.getItemAt(i);
       tempLayer.service = mapService.id;
       tempLayer.url = mapService.url;
       tempLayer.layer = mapService.name;

       layers.addItem(tempLayer);
      }
     }
    }
}

return layers;
}

topic Re: How to know which layers are currently visible in ArcGIS API for Flex Questions

How to know which layers are currently visible

Re: How to know which layers are currently visible