topic FeatureLayer visibility binding to checkbox in ArcGIS API for Silverlight Questions

FeatureLayer visibility binding to checkbox

bayramüçüncü — Wed, 06 Jun 2012 10:25:22 GMT

I have used the sample here.
But I added a checkbox and bind it to feature layers visibility. But not worked.

<esri:Map x:Name="MyMap" WrapAround="True" Extent="-15000000,2000000,-7000000,8000000">
            <esri:ArcGISTiledMapServiceLayer ID="StreetMapLayer"
                    Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"/>

            <esri:FeatureLayer ID="MyFeatureLayer"
                    Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/0"
                    Where="POP1990 > 100000" Renderer="{StaticResource MySimplePointRenderer}"
                    Visible="{Binding ElementName=checkBox1,Path=IsChecked,Mode=TwoWay}"/>
        </esri:Map>
       <CheckBox Content="CheckBox" Height="16" HorizontalAlignment="Left" Margin="25,12,0,0" Name="checkBox1" VerticalAlignment="Top" />

Re: FeatureLayer visibility binding to checkbox

DominiqueBroux — Thu, 07 Jun 2012 06:18:03 GMT

Hi Bayram,

The layers are not FrameworkElements and thus have no DataContext. So binding to an element name that is supposed to be in the Visual Tree doesn't work.

You can get it working by initiating the binding from the checkbox. Something like:

<esri:Map x:Name="MyMap" WrapAround="True" Extent="-15000000,2000000,-7000000,8000000"> <esri:ArcGISTiledMapServiceLayer ID="StreetMapLayer" Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"/>  <esri:FeatureLayer ID="MyFeatureLayer" Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/0"  Where="POP1990 > 100000" Renderer="{StaticResource MySimplePointRenderer}"/> </esri:Map> <CheckBox Content="CheckBox" Height="16" HorizontalAlignment="Left" Margin="25,12,0,0" VerticalAlignment="Top"        DataContext="{Binding Layers, ElementName=MyMap}"       IsChecked="{Binding [MyFeatureLayer].Visible, Mode=TwoWay}" />