topic Re: Custom Legend from arcgis10 sp1 in ArcGIS API for Silverlight Questions

Custom Legend from arcgis10 sp1

SantoshV — Thu, 31 Mar 2011 11:03:49 GMT

HI,
I am using the legend referring the SampleLegend example but here the legend shows all the symbols from the service.
I have used a where clause

            <esri:FeatureLayer ID="Points of Interest" Where="type ='2'"
                    Url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Fire/Sheep/MapServer/0" />

so I want the Legend to display the symbol of type 2 only is this possible.. how do I do this please guide

Re: Custom Legend from arcgis10 sp1

DominiqueBroux — Thu, 31 Mar 2011 13:14:42 GMT

The legend is not taking care of the current 'Where' clause.

You can do this by code.
Hook up an handler to the 'Refreshed' legend event and in this handler remove the legend items you don't want to see in the legend control.

Re: Custom Legend from arcgis10 sp1

SantoshV — Sat, 11 Dec 2021 09:55:13 GMT

The legend is not taking care of the current 'Where' clause.

You can do this by code.
Hook up an handler to the 'Refreshed' legend event and in this handler remove the legend items you don't want to see in the legend control.

Hi thnx for the reply I used the following code

           ESRI.ArcGIS.Client.Toolkit.Primitives.LayerItemViewModel removeLayerItemVM = null;

            if (e.LayerItem.LayerItems != null)
            {
                foreach (ESRI.ArcGIS.Client.Toolkit.Primitives.LayerItemViewModel layerItemVM in e.LayerItem.LayerItems)
                {
                    //if (layerItemVM.LegendItems != null && layerItemVM.LegendItems.Any())
                    //    layerItemVM.ImageSource = layerItemVM.LegendItems.First().ImageSource;

                    e.LayerItem.LayerItems.Remove(removeLayerItemVM);
                    if (layerItemVM.IsExpanded)
                        layerItemVM.IsExpanded = false;

                    if (layerItemVM.Label != "WEBRIS.SPL_ROADS")
                        removeLayerItemVM = layerItemVM;
                }
                if (removeLayerItemVM != null)
                    e.LayerItem.LayerItems.Remove(removeLayerItemVM);
            }
            else
            {
                e.LayerItem.IsExpanded = false;
            }

I am able to get the layer name but I want to display only some subtype how do I do tat
for eg under State I want to select/show only Alabama with symbol on the Legend

am I missing something here?

Re: Custom Legend from arcgis10 sp1

DominiqueBroux — Sat, 11 Dec 2021 09:55:15 GMT

The legend of a FeatureLayer doesn't contain any sub layers ==> we get the legend items (swatch+label) directly from the map layer item.
So your code should be something like:

 
if (e.LayerItem.Layer.ID ="Points of Interest" && e.LayerItem.LegendItems != null)
{
  var legendItemsToDelete = e.LayerItem.LegendItems.Where(item => item.Label != "WEBRIS.SPL_ROADS").ToList();
 
  foreach(item in legendItemsToDelete)
     e.LayerItem.LegendItems.Remove(item);
}

Re: Custom Legend from arcgis10 sp1

SantoshV — Sat, 11 Dec 2021 09:55:18 GMT

The legend of a FeatureLayer doesn't contain any sub layers ==> we get the legend items (swatch+label) directly from the map layer item.
So your code should be something like:
 
if (e.LayerItem.Layer.ID ="Points of Interest" && e.LayerItem.LegendItems != null)
{
  var legendItemsToDelete = e.LayerItem.LegendItems.Where(item => item.Label != "WEBRIS.SPL_ROADS").ToList();
 
  foreach(item in legendItemsToDelete)
     e.LayerItem.LegendItems.Remove(item);
}

well I tried the above code but it does not seem to work.. can you please be a little more elaborate

Re: Custom Legend from arcgis10 sp1

SantoshV — Sat, 11 Dec 2021 09:55:21 GMT

well I tried the above code but it does not seem to work.. can you please be a little more elaborate

thank you with little changes the code worked fine..
the code goes like this

            if (e.LayerItem.Layer.ID == "Districtsfl" && e.LayerItem.LegendItems != null)
            {
                var legendItemsToDelete = e.LayerItem.LegendItems.Where(item => item.Label != "Districtsfl").ToList();
 
              foreach(var item in legendItemsToDelete)
                  if (item.Label != "Bagalkot")
                  {
                      e.LayerItem.LegendItems.Remove(item);
                  }
            }