topic LayerList Widget - Turn on Sublayers in ArcGIS Viewer for Flex Questions

LayerList Widget - Turn on Sublayers

denverweston — Tue, 06 Aug 2013 00:08:33 GMT

Is there a way to turn on and off all sublayers within a group within the Layer List Widget when the group is checked or unchecked?

Re: LayerList Widget - Turn on Sublayers

denverweston — Tue, 06 Aug 2013 11:23:40 GMT

This code turns on all the items at the parent level. I was curious how to turn on all the layers at the child level?

var item:TocItem = TocItem(data);
   item.visible = _checkbox.selected;
   if(_checkbox.selected)
   {
    while(item.isTopLevel() == false)
    {
     item = item.parent;
     item.visible = true;
    }
   }

Re: LayerList Widget - Turn on Sublayers

DougBrowning — Tue, 06 Aug 2013 14:20:07 GMT

I did something similar to expand children. If you have one child then ask it for the parent. Then ask the parent what other children it has.

Like this toc.dataProvider.source.children.layerInfo.name

Re: LayerList Widget - Turn on Sublayers

denverweston — Tue, 06 Aug 2013 16:26:24 GMT

Did you do this in the TOC.itemrenderer?

I did something similar to expand children. If you have one child then ask it for the parent. Then ask the parent what other children it has.

Like this toc.dataProvider.source.children.layerInfo.name

Re: LayerList Widget - Turn on Sublayers

DougBrowning — Wed, 07 Aug 2013 16:33:47 GMT

In one version of mine i did add code to TOC.itemrender - in the createchildern function i think.

But in another version I setup a listener on the Show of a layer. This might work best for you since you want to take action when a layer is checked (made visible). You can set the listener for just the layers you want.

The code for this is
layerlist.addEventListener(FlexEvent.SHOW, mapLayerAddHandler2, false, 0, true);
where mapLayerAddHandler2 is your function.

I wanted my procedure to run whenever any layer, except basemaps, were made visible.

That code looks like this.

for (var j:int = 0; j < layerlist.length; j++)
{
      if (toc.basemapLayers.getItemIndex(layerlist.id) == -1)
    {
layerlist.addEventListener(FlexEvent.SHOW, mapLayerAddHandler2, false, 0, true);
    }
}

Hope that helps.