Edit date in DateTimePicker with Backspace / Delete key

2018-10-22

Question

_{Monday, October 22, 2018 7:28 AM}

Hello MSDN forum,

Is it possible to correct/edit DateTimePicker with delete key or backspace key?

Example: I mean to write 2018 but end up with 2918. So when the moment I type '9' i realize i type incorrect and want to use backspace to remove it. Is that possible?

So far, I try the keydown event with e.keychar = 8. It kinda work for backspace but i am unable to figure out the code to remove the front text one by one.

I think it might involve with location of cursor on text but i cant seem to find guide for it. Please give me some way

All replies (7)

_{Monday, October 22, 2018 7:53 AM}

Hi,

You can enter the value manually after clicking it after running.

 dtpTime.Format = DateTimePickerFormat.Custom
        dtpTime.CustomFormat = ""

Best Regards,

Alex

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_{Monday, October 22, 2018 8:12 AM}

Yes, i understand that. But what if user type incorrect and want to backspace to correct/edit?

_{Monday, October 22, 2018 8:38 AM}

Hi,

Clear data

 Private Sub dtpTime_ValueChanged(sender As Object, e As EventArgs) Handles dtpTime.ValueChanged
        dtpTime.Format = DateTimePickerFormat.Custom
    End Sub

    Private Sub dtpTime_KeyDown(sender As Object, e As KeyEventArgs) Handles dtpTime.KeyDown
        If e.KeyCode = Keys.Delete Or e.KeyCode = Keys.Back Then
            dtpTime.Format = DateTimePickerFormat.Custom
            dtpTime.CustomFormat = " "
        End If
    End Sub

Best Regards,

Alex

_{Wednesday, October 24, 2018 4:11 AM}

I know about the clear date with key press. But what i want is that i try to get Backspace key/Delete Key to edit (remove the letter) in datetimepicker box

_{Thursday, October 25, 2018 7:46 AM}

Yes, i understand that. But what if user type incorrect and want to backspace to correct/edit?

Hi,

It seems that we can only modify the data like this.

Best Regards,

Alex

_{Thursday, October 25, 2018 8:40 AM}

Hello Alex ,

I have a question about using Delete or Back.

Works great , but maybe i am doing something wrong or missing something.

When i select a date lets say today , and use Delete it clears the Datetimepicker.

But when i select the date again of today , nothing is showing .

Have to select another date first and then back select today .

 
 Private Sub Datumgemeldlossen_KeyDown(sender As Object, e As KeyEventArgs) Handles Datumgemeldlossen.KeyDown
        If e.KeyCode = Keys.Delete Or e.KeyCode = Keys.Back Then
            Datumgemeldlossen.Format = DateTimePickerFormat.Custom
            Datumgemeldlossen.CustomFormat = " "
        End If
 
    End Sub

Because i have a lot of datetimepickers i use this first.

  Private Sub SetDateTimePickerFormat(Optional format As String = " ", Optional container As Control = Nothing)

        If container Is Nothing Then container = Me
        For Each c As Control In container.Controls()
            If TypeOf c Is DateTimePicker Then
                Dim d As DateTimePicker = DirectCast(c, DateTimePicker)
                d.CustomFormat = format
                d.Format = DateTimePickerFormat.Custom
                If d.Tag Is Nothing Then
                    'only once
                    AddHandler d.ValueChanged, AddressOf DateTimePickerS_ValueChanged
                    d.Tag = "has handler"
                End If
            ElseIf c.Controls.Count > 0 Then 'container           
                SetDateTimePickerFormat(format, c)
            End If
        Next
    End Sub

    Private Sub DateTimePickerS_ValueChanged(sender As Object,
                                             e As EventArgs)

        Dim dtp As DateTimePicker = DirectCast(sender, DateTimePicker)
        If dtp.CustomFormat.Trim = "" Then
            dtp.CustomFormat = "dd-MM-yyyy"
        End If

    End Sub

_{Thursday, October 25, 2018 9:07 AM}

You can use DTS_APPCANPARSE style,

but all the field will be editable and you will have to valid it in DTN_USERSTRING notification (WM_REFLECT + WM_NOTIFY in an inherited DTP class)

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Edit date in DateTimePicker with Backspace / Delete key

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