Custrom Filter Editors

[Hristiliyan]

Hello,

I want to implement a ComboBox in two of my FilterDescriptors. I do exactly the same as in the Demos, and it does not work at all. My ComboBox return value is String, I checked it and it returns the value I want. But the DataFilter does not filter the DataGrid. It work with the regular text input method, but not with the ComboBox. 

Here is what I've done:

<DataTemplate x:Key="RegionFilterEditorTemplate">

            <telerik:RadComboBox SelectedValue="{Binding Path=NAME, Mode=TwoWay, FallbackValue=null}" DisplayMemberPath="NAME" SelectedValuePath="NAME"

                                     MinWidth="100" SelectionChanged="RegionSelected"/>

        </DataTemplate>

        <DataTemplate x:Key="MUNFilterEditorTemplate">

            <telerik:RadComboBox SelectedValue="{Binding Path=NAME, Mode=TwoWay, FallbackValue=null}" DisplayMemberPath="NAME" SelectedValuePath="NAME"

                                     MinWidth="100" SelectionChanged="MunicipalitySelected"/>

        </DataTemplate>

        <local:MyEditorTemplateSelector x:Key="MyEditorTemplateSelector">

            <local:MyEditorTemplateSelector.EditorTemplateRules>

                <local:EditorTemplateRule PropertyName="N_MUN.N_REGION.NAME"

                                              DataTemplate="{StaticResource RegionFilterEditorTemplate}"/>

                <local:EditorTemplateRule PropertyName="N_MUN.NAME"

                                              DataTemplate="{StaticResource MUNFilterEditorTemplate}"/>

            </local:MyEditorTemplateSelector.EditorTemplateRules>

        </local:MyEditorTemplateSelector>

<telerik:RadDataFilter Name="CitiesFilter" Source="{Binding}" Loaded="CitiesFilter_Loaded" AutoGenerateItemPropertyDefinitions="False" CanUserCreateCompositeFilters="False" EditorCreated="OnRadDataFilterEditorCreated" EditorTemplateSelector="{StaticResource MyEditorTemplateSelector}" >

                    <telerik:RadDataFilter.ItemPropertyDefinitions>

                        <datafilter:ItemPropertyDefinition PropertyName="N_MUN.N_REGION.NAME" PropertyType="{Binding String, Source={StaticResource Types}}" DisplayName="Област" />

                        <datafilter:ItemPropertyDefinition PropertyName="N_MUN.NAME" PropertyType="{Binding String, Source={StaticResource Types}}" DisplayName="Община" />

                        <datafilter:ItemPropertyDefinition PropertyName="NAME" PropertyType="{Binding String, Source={StaticResource Types}}" DisplayName="Населено място" />

                    </telerik:RadDataFilter.ItemPropertyDefinitions>

                </telerik:RadDataFilter>

<telerik:RadGridView x:Name="CitiesGrid" ItemsSource="{Binding FilteredSource, ElementName=CitiesFilter}"

                                     AutoGenerateColumns="False"

                                     IsReadOnly="True"

                                     ScrollMode="RealTime"

                                     CanUserReorderColumns="False"

                                     GridLinesVisibility="Both"

                                     IsFilteringAllowed="False"

                                     ShowGroupPanel="False"

                                     ColumnWidth="Auto">

                                      

                    <telerik:RadGridView.Columns>

 

 <telerik:GridViewDataColumn Header="{x:Static res:CitiesDialogFormRes.REGION}"

                                                    DataMemberBinding="{Binding Path=N_MUN.N_REGION.NAME}"

                                                    Width="Auto"/>

                        <telerik:GridViewDataColumn Header="{x:Static res:CitiesDialogFormRes.MUN}"

                                                    DataMemberBinding="{Binding Path=N_MUN.NAME}"

                                                    Width="Auto" />

                        <telerik:GridViewDataColumn Header="{x:Static res:CitiesDialogFormRes.CITY}"

                                                    DataMemberBinding="{Binding Path=NAME}"

                                                    Width="Auto" />

 

 

                    </telerik:RadGridView.Columns>

                </telerik:RadGridView>


And the .cs file:
                  

private void OnRadDataFilterEditorCreated(object sender,Telerik.Windows.Controls.Data.DataFilter.EditorCreatedEventArgs e)
        {

            switch (e.ItemPropertyDefinition.PropertyName)
            {
                case "N_MUN.N_REGION.NAME":
                    regionComboBox = (RadComboBox)e.Editor;
                    regionComboBox.ItemsSource = db.N_REGION.OrderBy(N_REGION => N_REGION.NAME);
                    break;
                case "N_MUN.NAME":
                    munComboBox = (RadComboBox)e.Editor;
                    break;

            }
        }

private void CitiesFilter_Loaded(object sender, RoutedEventArgs e)
        {
            FilterDescriptor regionsFilterDesc = new FilterDescriptor("N_MUN.N_REGION.NAME", FilterOperator.IsEqualTo, "", true);
            FilterDescriptor munsFilterDesc = new FilterDescriptor("N_MUN.NAME", FilterOperator.IsEqualTo, "", true);
            this.CitiesFilter.FilterDescriptors.Add(regionsFilterDesc);
            this.CitiesFilter.FilterDescriptors.Add(munsFilterDesc);
        }

private void RegionSelected(object sender, SelectionChangedEventArgs e)
        {
            regionComboBox = (RadComboBox)e.OriginalSource;
            var selectedRegion = regionComboBox.SelectedValue;
            munComboBox.ItemsSource = db.N_MUN.Where(N_MUN => N_MUN.N_REGION.NAME.Equals(selectedRegion)).OrderBy(N_MUN => N_MUN.NAME);
        }

[Rossen Hristov]

Hello Hristiliyan,

Your editor control (no matter what it is) should update the Value property of the underlying ViewModel. Our ViewModel does not have a property called "NAME".

Here is part of the online sample code:

<DataTemplate x:Key="NameFilterEditorTemplate">
                <telerik:RadComboBox SelectedValue="{Binding Value, Mode=TwoWay, FallbackValue=null}"
                                     MinWidth="100"/>
            </DataTemplate>

Your custom editor should under all circumstances be bound to the Value property of the view model.

I hope this helps. Let me know if you have any other questions.

Best wishes,
Ross
the Telerik team

[Hristiliyan]

Thank you a lot ...