topic Re: SFV: Chart Widget - Make Layer Visible when widget is activated. in ArcGIS API for Flex Questions

SFV: Chart Widget - Make Layer Visible when widget is activated.

RichWestfall — Wed, 05 May 2010 20:55:35 GMT

Hello,

I am using the chart widget to serve up census information. I have the census block layer accessible to the SFV. I would like the census block layer to be visible when the chart widget is activated. When the chart widget is closed or minimized I would like the census block layer invisible.

Has anyone attempted something similiar? Any help would be appreciated.

Rich

Re: SFV: Chart Widget - Make Layer Visible when widget is activated.

RobertScheitlin__GISP — Wed, 05 May 2010 21:39:29 GMT

richwestfall,

If the census block layer is in the map the you can just do something like

map.getLayer(yourName).visible = true;

Re: SFV: Chart Widget - Make Layer Visible when widget is activated.

RichWestfall — Thu, 06 May 2010 14:37:31 GMT

Robert,

I appreciate the help. I have tried entering the code in the chart widget in the openhandler/closedhandler to no avail. Is there another section I should try this in?

Thanks for your help.

Rich

Re: SFV: Chart Widget - Make Layer Visible when widget is activated.

RobertScheitlin__GISP — Thu, 06 May 2010 14:52:50 GMT

Rich,

Is the layer that you are trying to make visible a sublayer of a map service? If so that requires some more code.

Re: SFV: Chart Widget - Make Layer Visible when widget is activated.

RichWestfall — Thu, 06 May 2010 15:12:41 GMT

Robert,

Yes it is a grouped layer in a large service. Attached is a pdf showing the location. It is layer id 48.

Rich

Re: SFV: Chart Widget - Make Layer Visible when widget is activated.

RobertScheitlin__GISP — Fri, 10 Dec 2021 21:12:56 GMT

Rich,

Here is two function to use one for hiding the sublayer one for showing

private hideSubLayer(layer:Layer,id:int):void
   {
    var visibleLayers:ArrayCollection;
    if (layer is ArcGISDynamicMapServiceLayer)
    {
     visibleLayers = ArcGISDynamicMapServiceLayer(layer).visibleLayers;
     var idIndex:int = visibleLayers.getItemIndex(id);
     if (idIndex != -1)
     {
      visibleLayers.removeItemAt(idIndex);
     }
    }
   }
   
   private showSubLayer(layer:Layer,id:int):void
   {
    var visibleLayers:ArrayCollection;
    if (layer is ArcGISDynamicMapServiceLayer)
    {
     visibleLayers = ArcGISDynamicMapServiceLayer(layer).visibleLayers;
     visibleLayers.addItem(id);
    }
   }

Re: SFV: Chart Widget - Make Layer Visible when widget is activated.

RichWestfall — Mon, 10 May 2010 18:14:50 GMT

Robert,

Thank you for this. I have been working with it but I'm unsure where to put the sublayer information the function is refering too. All avenues I have tried will either not get the function to work or not compile.

Rich

Re: SFV: Chart Widget - Make Layer Visible when widget is activated.

RobertScheitlin__GISP — Mon, 10 May 2010 18:25:44 GMT

Rich,

Hmm. Have you tried something like

showSubLayer(map.getLayer("Planning"),48);

Re: SFV: Chart Widget - Make Layer Visible when widget is activated.

RichWestfall — Fri, 10 Dec 2021 21:12:59 GMT

Robert,

Yes I have tried that and the error is need rightpar before dot. I have also tried the following attached code and don't get and error message it just hangs flex builder and will not compile the chart widget.

Rich

private function hideSubLayer (map.getLayer("Planning"),48):void
   {
    var visibleLayers:ArrayCollection;
    if (layer is ArcGISDynamicMapServiceLayer)
    {
     visibleLayers = ArcGISDynamicMapServiceLayer(layer).visibleLayers;
     var idIndex:int = visibleLayers.getItemIndex(id);
     if (idIndex != -1)
     {
      visibleLayers.removeItemAt(idIndex);
     }
    }
   }
   
   private function showSubLayer (map.getLayer("Planning"),48):void
   {
    var visibleLayers:ArrayCollection;
    if (layer is ArcGISDynamicMapServiceLayer)
    {
     visibleLayers = ArcGISDynamicMapServiceLayer(layer).visibleLayers;
     visibleLayers.addItem(id);
    }
   }

Re: SFV: Chart Widget - Make Layer Visible when widget is activated.

MichaelHoff — Thu, 01 Jul 2010 19:40:14 GMT

richwestfall,

If the census block layer is in the map the you can just do something like
map.getLayer(yourName).visible = true;

With the chart widget, where would I put this in the mxml? I have tried under the widgetOpenHandler but had no success.