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Enabling layers

FaizanTayyab

Hi,

i have tried to use the code below to make the layer visible.

map.getLayer("USA Daytime Population").visible=ture

but it is giving me a null reference error. Doesnt the getLayer method accept sub layers?

Is there anyway to make a certain sublayer visible based on a certain condition.

Thanks

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deleted-user-0W0-oLHxDjCX

Try evt.stopPropagation();

FaizanTayyab

I got some code from another thread which helped in enabling the toc based upon visibilty of the layer. It works great for child layers in a map service layer but doesnt work for the group layers containing further sub layers.

The result i get is that the unexpectedly all sublayers under the group layer become visible yet the tick boxes for those layers remain unchecked (which is fine), however i am not sure why the sublayers become visible for example

If i have a group layer

Infrastructure
----buildings
----structures
----roads

and i use the code below to only put tick boxes for the group layer called Infrastructure and buildings, it does work and only those checkboxes are ticked but i also get structures and roads visible on the map yet their checkboxes are unticked.
var visLayers:ArrayCollection = dmsl.visibleLayers;
var newVisLayer:ArrayCollection=new ArrayCollection(obj.visLyrs.visibleLayer);
for each(var j:int in newVisLayer){
AppEvent.dispatch(AppEvent.LAYER_VISIBILITY_CHANGED,j);
}
In toc Item i have
public function TocItem( parentItem:TocItem = null )
{
 _parent = parentItem;
 //ViewerContainer.addEventListener(AppEvent.LAYER_VISIBILITY_CHANGED, updateCB);
 AppEvent.addListener(AppEvent.LAYER_VISIBILITY_CHANGED,updateCB);
}

private function updateCB(event:AppEvent):void
{
 if(this is TocLayerInfoItem)
            {
           var tli:TocLayerInfoItem = this as TocLayerInfoItem;
    
  if(tli.layerInfo.id == event.data){
   setVisibleDirect(_visible ? false : true);
  }
 }

I have got the group layers problem sorted however now i have another problem.

The function updateCB is repeatedly called for all map services. For example if i only want to loop through the sub layers of map service #1, it goes them fine but also goes through sub layers of map service #2.

How can i restrict it to only loop through 1 map service.

Any ideas

FaizanTayyab

I got some code from another thread which helped in enabling the toc based upon visibilty of the layer. It works great for child layers in a map service layer but doesnt work for the group layers containing further sub layers.

The result i get is that the unexpectedly all sublayers under the group layer become visible yet the tick boxes for those layers remain unchecked (which is fine), however i am not sure why the sublayers become visible for example

If i have a group layer

Infrastructure
----buildings
----structures
----roads

and i use the code below to only put tick boxes for the group layer called Infrastructure and buildings, it does work and only those checkboxes are ticked but i also get structures and roads visible on the map yet their checkboxes are unticked.

var visLayers:ArrayCollection = dmsl.visibleLayers;
var newVisLayer:ArrayCollection=new ArrayCollection(obj.visLyrs.visibleLayer);
for each(var j:int in newVisLayer){
AppEvent.dispatch(AppEvent.LAYER_VISIBILITY_CHANGED,j);
}

In toc Item i have

public function TocItem( parentItem:TocItem = null )
{
 _parent = parentItem;
 //ViewerContainer.addEventListener(AppEvent.LAYER_VISIBILITY_CHANGED, updateCB);
 AppEvent.addListener(AppEvent.LAYER_VISIBILITY_CHANGED,updateCB);
}

private function updateCB(event:AppEvent):void
{
 if(this is TocLayerInfoItem)
            {
           var tli:TocLayerInfoItem = this as TocLayerInfoItem;
    
  if(tli.layerInfo.id == event.data){
   setVisibleDirect(_visible ? false : true);
  }
 }

FaizanTayyab

Faizan,

Yes the visibleLayers array collection will never list the id of a group layer but you can add that id to turn on the group.

Thanks for the advice. I thought the visibleLayers was a read only property but found out that it is read and write. Although i got it work fine, i am unable to get the toc to reflect the same. I am assuming that requires more logic to update the toc with the visibility of each sublayer.

RobertScheitlin__GISP

Faizan,

Yes the visibleLayers array collection will never list the id of a group layer but you can add that id to turn on the group.

FaizanTayyab

Faizan,

No getLayer is not for individual layers only the whole map service to enable visibility on a particular layer in the map service you would use visibleLayers array Collection. Look at the documentation for a layer like ArcGISDynamicMapService and you will see visible layers property and some examples of how to use it.

Thanks for the reply. In terms of visibleLayers, i do not get the group layers returned. is this a built in limitation?

RobertScheitlin__GISP

Faizan,

No getLayer is not for individual layers only the whole map service to enable visibility on a particular layer in the map service you would use visibleLayers array Collection. Look at the documentation for a layer like ArcGISDynamicMapService and you will see visible layers property and some examples of how to use it.

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