topic How can I make the Legend tree nodes collapse by default? in ArcGIS API for Silverlight Questions

How can I make the Legend tree nodes collapse by default?

weiliang — Mon, 08 Aug 2011 19:13:03 GMT

Hi,

I am using ESRI's Legend with template for my TOC, but by default, the most levels of the tree nodes are expended. Is there a easy way that I can collapse these nodes at the initialization phase?

Also in the Legend, in one of our dynamic map service, we want to change the map service URL to another service if the user click a button. The legend refreshes automatically, however, the on/off check boxes are kind been changed from the initial service settings (e.g., some check boxes, which should be unchecked by default, are checked, and vice versa). Is there a way that I can fix it?

Any help is welcome.

Wei

Re: How can I make the Legend tree nodes collapse by default?

weiliang — Mon, 15 Aug 2011 19:12:08 GMT

Can somebody help me out? Especially for the service URL changing issue.

Many thanks,

Wei

Re: How can I make the Legend tree nodes collapse by default?

TerryGiles — Sat, 11 Dec 2021 18:14:21 GMT

The code below is in the legend's Refreshed event and should collapse all nodes under each layer. Not sure on the check boxes - maybe rebind the the map property of the legend?

        private void mapLegend_Refreshed(object sender, Legend.RefreshedEventArgs e)
        {
            CollapseLayerItems(e.LayerItem);
        }

        private void CollapseLayerItems(LayerItemViewModel livm)
        {
            //collapses a node in the legend tree and all of its sub layers recursively
            livm.IsExpanded = false;
            if (livm.LayerItems != null)
            {
                foreach (LayerItemViewModel sublayerItemVM in livm.LayerItems)
                {
                    CollapseLayerItems(sublayerItemVM);
                }
            }

        }

Re: How can I make the Legend tree nodes collapse by default?

weiliang — Tue, 16 Aug 2011 14:34:18 GMT

Many thanks, Terry. I will try to see if it works for me.

Wei