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TwoWay Binding IsChecked on a checkbox not working

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GridView

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Mike Gold asked on 15 Mar 2010, 10:42 PM

Hi Telerik,

I'm using the Q4 release and wondering if this was fixed or perhaps I'm doing something wrong. If I create a GridViewDataColumn with a checkbox in a cell template, the two way binding doesn't work coming back from my viewmodel properly. It notifies the grid I think, but you need to scroll or page back and forth to see the update of the checkbox. In other words, if I set IsSelected to true in my view model, it doesn't get reflected in the grid unless I scroll up and down or page back and forth. Then I see the refresh properly.

To better understand the issue

Here is my XAML:

    
                    <telerik:RadGridView Grid.Row="1" x:Name="SearchResultsGrid" ItemsSource="{Binding SearchResults}"  FrozenColumnCount="2" AutoGenerateColumns="False"   
        
                                         HeaderRowStyle="{StaticResource SearchHeaderRowStyle}"   
        
                                         RowStyle="{StaticResource SearchNormalRowStyle}"   
        
                                         AlternateRowStyle="{StaticResource SearchAlternatingRowStyle}"   
        
                                         AlternationCount="2"   
        
                                         RowIndicatorVisibility="Collapsed" 
        
                                         MultipleSelect="True" SelectionChanged="OnRowSelected" 
        
                                                                      ><!--Background="{StaticResource GridViewRowNormalBackground}"--> 
        
                        <telerik:RadGridView.SortDescriptors> 
        
                            <telerikData:SortDescriptor Member="Schema.Name" 
        
                                               SortDirection="Ascending" /> 
        
                        </telerik:RadGridView.SortDescriptors> 
        
                        <telerik:RadGridView.Columns> 
        
                            <telerik:GridViewDataColumn x:Name="CheckBoxColumn" Header="+"  DataMemberBinding="{Binding}" IsReadOnly="True" > 
        
                                <telerik:GridViewDataColumn.CellTemplate> 
        
                                    <DataTemplate> 
        
                                        <Border BorderThickness="1" BorderBrush="Gray"  DataContext="{Binding}" > 
        
                                            <CheckBox Style="{StaticResource CheckBox.Standard}" IsChecked="{Binding IsSelected, Mode=TwoWay}" /> 
        
                                         </Border> 
        
                                    </DataTemplate>          
        
                                </telerik:GridViewDataColumn.CellTemplate> 
        
                            </telerik:GridViewDataColumn>

Here is my view model

    
                    private bool isSelected;  
        
                    public bool IsSelected  
        
                    {  
        
                        get { return isSelected; }  
        
                        set { isSelected = value;  
        
                            PropertyChanged.Raise(this, "IsSelected");  
        
                        }  
        
                    }

9 Answers, 1 is accepted

answered on 15 Apr 2010, 02:55 PM

Yes,
The object implements INotifyPropertyChanged

    
             bool _isChange;  
        
                    public bool isChange  
        
                    {  
        
                        get  
        
                        {  
        
                            return _isChange;  
        
                        }  
        
                        set  
        
                        {  
        
                            _isChange = value;  
        
                            OnPropertyChanged("isChange");  
        
                        }  
        
                    }  
        
                    #region INotifyPropertyChanged Members  
        
                    private void OnPropertyChanged(string propertyName)  
        
                    {  
        
                        if (PropertyChanged != null)  
        
                        {  
        
                            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));  
        
                        }  
        
                    }  
        
                    public event PropertyChangedEventHandler PropertyChanged;  
        
                    #endregion

If I debug, I can cleary see that the boolean is changed. However it is not reflected on the checkbox in the column.

answered on 15 Apr 2010, 03:06 PM

silverlightapplication1.zip

Hello,

I've just tried this using our Q1 2010 binaries however the grid worked as expected. You can check the attached project for reference.

Kind regards,
Vlad
the Telerik team

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answered on 29 May 2012, 08:32 AM

Hi Vlad,

i have gone through your attachment it was simply awesome and thanks.
when i click on button fine OnPropertyChanged property is getting fired.
but when i click on check box on the client side(while running) OnPropertyChanged property should get fired(which is what my reqmnt) for that i used CellEditEnded event but im not getting the expected result.

ok let me put my question in this way.. how can i do make OnPropertyChanged fired on click of check box during runtime?
could you please let me know how to make it editable on client side(which should get effect in the back end)

Please try to reply me as soon as you can.
Thanks in advance.

Regards,
Rajesh KS