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Validating / Styling

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ComboBox
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Martin Egger
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Martin Egger asked on 30 Apr 2010, 05:08 PM
Hi

I have a small problem. When I validate a TextBoxes Value and than giving the User a visual feedback everything works prefectly fine.

When I do this with a RadComboBox, the only thing that works is the validation part. But I don't get any visual feedback. Here is the XAML part in my App.xaml

<Application x:Class="CDM.App" 
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
             xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" 
             xmlns:telerikInput="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Input" 
             > 
    <Application.Resources> 
    <Storyboard x:Key="FlashError"
            <ObjectAnimationUsingKeyFrames BeginTime="00:00:00"  
                                       Storyboard.TargetProperty="(UIElement.Visibility)"
                <DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{x:Static Visibility.Visible}"/> 
                <DiscreteObjectKeyFrame KeyTime="00:00:05" Value="{x:Static Visibility.Hidden}"/> 
            </ObjectAnimationUsingKeyFrames> 
        </Storyboard> 
    <Style x:Key="myErrorTemplate" TargetType="Control"
        <Setter Property="Validation.ErrorTemplate"
            <Setter.Value> 
                <ControlTemplate> 
                    <StackPanel Orientation="Vertical"
                        <Border BorderBrush="Red" BorderThickness="1"
                            <AdornedElementPlaceholder Name="mycontrol"
 
                                <Label Foreground="White" Background="Red"  
                                           Content="{Binding ElementName=mycontrol,  
                                                     Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"> 
                                        <Label.Triggers> 
                                            <EventTrigger RoutedEvent="FrameworkElement.Loaded"
                                                <BeginStoryboard Storyboard="{StaticResource FlashError}" /> 
                                            </EventTrigger> 
                                        </Label.Triggers> 
                                    </Label> 
                            </AdornedElementPlaceholder> 
                        </Border> 
 
                        <!--<Label Foreground="White" Background="Red"  
                                           Content="{Binding ElementName=mycontrol,  
                                                     Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"> 
                        </Label>--> 
                    </StackPanel> 
                </ControlTemplate> 
            </Setter.Value> 
        </Setter> 
        <Style.Triggers> 
 
            <Trigger Property="Validation.HasError" Value="true"
                <Setter Property="ToolTip"  
                            Value="{Binding  
                                    RelativeSource={x:Static RelativeSource.Self}, 
                                    Path=(Validation.Errors)[0].ErrorContent}" /> 
            </Trigger> 
        </Style.Triggers> 
    </Style> 
 
      <Style TargetType="TextBox" BasedOn="{StaticResource myErrorTemplate}" /> 
    <Style TargetType="CheckBox" BasedOn="{StaticResource myErrorTemplate}" /> 
        <Style TargetType="telerik:RadComboBox" BasedOn="{StaticResource myErrorTemplate}" /> 
    </Application.Resources> 
</Application> 
 

And here the the C# Part for Validation. Allthough I am convincied that the validation works. Tested it several times.

    public Platten() 
        { 
            this.preisReference.AssociationChanged += new CollectionChangeEventHandler(preisReference_AssociationChanged); 
 
            this.AddError("preis""Preiscode fehlt!"); 
        } 
 
        void preisReference_AssociationChanged(object sender, CollectionChangeEventArgs e) 
        { 
            if (e.Action == CollectionChangeAction.Remove) 
            { 
                OnPropertyChanging("preis"); 
            } 
            else 
            { 
                if (e.Action == CollectionChangeAction.Add) 
                { 
                    this.RemoveError("preis"); 
                } 
                OnPropertyChanged("preis"); 
            } 
        } 
        #region IDataErrorInfo Members 
        private Dictionary<stringstring> m_validationErrors = new Dictionary<stringstring>(); 
 
        private void AddError(string columnName, string msg) 
        { 
            if (!m_validationErrors.ContainsKey(columnName)) 
            { 
                m_validationErrors.Add(columnName, msg); 
            } 
        } 
 
        private void RemoveError(string columnName) 
        { 
            if (m_validationErrors.ContainsKey(columnName)) 
            { 
                m_validationErrors.Remove(columnName); 
            } 
        } 
 
        public bool HasErrors 
        { 
            get { return m_validationErrors.Count > 0; } 
        } 
 
        public string Error 
        { 
            get 
            { 
                if (m_validationErrors.Count > 0) 
                { 
                    return "Customer data is invalid"
                } 
                else 
                { 
                    return null
                } 
            } 
        } 
 
        public string this[string columnName] 
        { 
            get 
            { 
                if (m_validationErrors.ContainsKey(columnName)) 
                { 
                    return m_validationErrors[columnName]; 
                } 
                else return null
            } 
        } 
        #endregion 


Thanks for your help.






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Hristo
Telerik team
answered on 06 May 2010, 08:18 AM
Hello Martin Egger,

We are unable to run your project because there are missing parts.
Could you send us sample project (you have to open a support ticket in order to attach files) so that we can be sure that we are working on the same issue?

Kind regards,
Hristo
the Telerik team

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Martin Egger
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Hristo
Telerik team
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