[Solved] Detect when CheckBoxColumn is clicked

[JungTae]

Hello Telerik Team, I have a checkbox column which is binded to a boolean value. I need to detect when the user checks or unchecks the checkbox column. Is there any way to detect this? I am using silverlignt 3 on VSTS 2008 SP1. If no such builtin eventhandler, is there a good workaround?

[Kjell]

Does either one of these events work for you?

<telerik:GridViewCheckBoxColumn>
      <telerik:GridViewCheckBoxColumn.CellTemplate>
                <DataTemplate>
                  <CheckBox IsChecked="false" Checked="CheckBox_Checked" Click="CheckBox_Click" />
                </DataTemplate>
       </telerik:GridViewCheckBoxColumn.CellTemplate>
</telerik:GridViewCheckBoxColumn>

[Timothy]

You can define the checkbox click event as follows,

This event first checks to see if the column type is customcolumn. You can replace this with a check for Checkbox Column, etc..

Then it does some custom things based off the current state of the cell and underlying checkbox.

Private Sub CheckListItemssDataGrid_CurrentCellChanged(ByVal sender As Object, ByVal e As Telerik.Windows.Controls.GridViewCurrentCellChangedEventArgs) Handles CheckListItemssDataGrid.CurrentCellChanged
        Dim cell As GridViewCell = CheckListItemssDataGrid.CurrentCell
        Dim chk As CheckBox = (cell.ChildrenOfType(Of CheckBox)()).FirstOrDefault()
        If TypeOf CheckListItemssDataGrid.CurrentColumn Is CustomColumn Then
            If (Keyboard.Modifiers And ModifierKeys.Shift) = ModifierKeys.Shift Then
                If cell.Value IsNot Nothing Then
                    cell.Value = Nothing
                    chk.IsChecked = Nothing
                    cell.IsEnabled = True
                    chk.Visibility = System.Windows.Visibility.Collapsed
                    cell.Background = New SolidColorBrush(Colors.LightGray)
                    CheckListItemssDataGrid.CommitEdit()
                    CheckListItemssDataGrid.SelectedItems.Clear()
                    MessageBox.Show("Click Submit Changes When you are done disabling tasks")
                    cell.IsCurrent = True
                    Exit Sub
                ElseIf cell.Value Is Nothing Then
                    cell.Value = False
                    cell.Background = New SolidColorBrush(Colors.White)
                    CheckListItemssDataGrid.CommitEdit()
                    CheckListItemssDataGrid.SelectedItems.Clear()
                    MessageBox.Show("Click Submit Changes When you are done modifying tasks. A page refresh is required to display previously disabled tasks properly.")
                    Exit Sub
                Else
                End If
            Else
                If cell.Value Is Nothing Then
                    CheckListItemssDataGrid.CancelEdit()
                    CheckListItemssDataGrid.SelectedItems.Clear()
                    Exit Sub
                End If
                If cell.Value = False Then
                    If chk.IsChecked = False Then
                        Checkbox_Click(cell)
                    Else
                    End If
                ElseIf cell.Value = True Then
                    If chk.IsChecked = True Then
                        cell.Background = New SolidColorBrush(Colors.White)
                        CheckListItemssDataGrid.CommitEdit()
                        CheckListItemssDataGrid.SelectedItems.Clear()
                    Else
                    End If
                End If
            End If
        End If
    End Sub

[JungTae]

Timothy, I'd love to try your code, but unfortunately, I'm coding in C# and I am unfamiliar with VB .NET..

Could you please rewrite this 1 line in c# if you can? I'll try it on my own, but chances are I'm going to get it wrong

Private Sub CheckListItemssDataGrid_CurrentCellChanged(ByVal sender As Object, ByVal e As Telerik.Windows.Controls.GridViewCurrentCellChangedEventArgs) Handles CheckListItemssDataGrid.CurrentCellChanged