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ComboBox and Validation

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GridView

This is a migrated thread and some comments may be shown as answers.

mampus asked on 11 Oct 2010, 04:18 AM

Hello guys,
I have 2 problems:
1. I'm try to use gridViewComboBox, but i got this problem:
- how can I put my item(s) collection without connect throught the database??

2. I try to making a validation for each cells using the cellvalidating events, the problem is, why if I create a new row, the validation doesn't work???
here my codes:

Private Sub TabelBuku_CellValidating(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.CellValidatingEventArgs) Handles TabelBuku.CellValidating

Dim kolom = TryCast(e.Column, GridViewDataColumn)

If ((TypeOf e.Row Is GridViewDataRowInfo) AndAlso (kolom IsNot Nothing) AndAlso (kolom.FieldName = "IdBuku")) Then

Dim baris = DirectCast(e.Row, GridViewDataRowInfo)

Dim nilai = DirectCast(e.Value, String)

If (String.IsNullOrEmpty(nilai)) Then

e.Cancel = True

lblKesalahan.BackColor = Color.LightYellow

lblKesalahan.ForeColor = Color.Red

lblKesalahan.Text = "ID Buku Harus Diisi!!"

baris.ErrorText = "ID Buku Harus Diisi!!"

Else

baris.ErrorText = String.Empty

lblKesalahan.BackColor = Color.Transparent

lblKesalahan.ForeColor = Color.LimeGreen

lblKesalahan.Text = "EDITOR DATA BUKU"

End If

End Sub

9 Answers, 1 is accepted

answered on 11 Oct 2010, 06:45 AM

Hello Mampus,

1. If by that question you mean how to set the data source for the GridViewComboBox column, i would suggest Creating the column on DataBindingComplete and set the DataSource for the column there, and the necessary relations, like this:

Private Sub RadGridView1_DataBindingComplete(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.GridViewBindingCompleteEventArgs) Handles RadGridView1.DataBindingComplete

Dim grid = DirectCast(sender, RadGridView)

Dim comboBoxColumn As New GridViewComboBoxColumn("ComboColumn")

comboBoxColumn.DataSource = New Object() {"aaa", "bbb", "ccc"}

comboBoxColumn.FieldName = "Id"

comboBoxColumn.ValueMember = "Id"

grid.Columns.Add(comboBoxColumn)

End Sub

And for the CellValidation, it was not working because of this check here: (TypeOf e.Row Is GridViewDataRowInfo), because when you are creating a new row, the type of the row is GridViewNewRowInfo, but in order to avoid checking for all the necessary types you the simplest way to do this is to change it to:

Private Sub RadGridView1_CellValidating(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.CellValidatingEventArgs) Handles RadGridView1.CellValidating

Dim kolom = TryCast(e.Column, GridViewDataColumn)

If ((kolom IsNot Nothing) AndAlso (kolom.FieldName = "Name")) Then

Dim nilai = DirectCast(e.Value, String)

If (String.IsNullOrEmpty(nilai)) Then

e.Cancel = True

lblKesalahan.BackColor = Color.LightYellow

lblKesalahan.ForeColor = Color.Red

lblKesalahan.Text = "ID Buku Harus Diisi!!"

e.Row.ErrorText = "ID Buku Harus Diisi!!"

Else

e.Row.ErrorText = String.Empty

lblKesalahan.BackColor = Color.Transparent

lblKesalahan.ForeColor = Color.LimeGreen

lblKesalahan.Text = "EDITOR DATA BUKU"

End If

End Sub

Hope this helps, if you have any other questions or comments, please let me know,

Best Regards,
Emanuel Varga

answered on 11 Oct 2010, 02:34 PM

thanks for the answers, it's really helpfull...
i'm doing this way:

Dim kolom = TryCast(e.Column, GridViewDataColumn)

Dim namaKolom As String

If ((TypeOf e.Row Is GridViewDataRowInfo Or (TypeOf e.Row Is GridViewNewRowInfo)) AndAlso (kolom IsNot Nothing) AndAlso (kolom.FieldName = namaKolom)) Then

Dim nilai = DirectCast(e.Value, String)

If (String.IsNullOrEmpty(nilai)) Then



	      e.cancel = True
          e.Row.ErrorText = "Tahun Terbit Harus Diisi!!"
          With lblKesalahan
              .BackColor = Color.LightYellow
              .ForeColor = Color.Red
              .Text = "Tahun Terbit Harus Diisi!!"
          End With
      Else
          e.Row.ErrorText = String.Empty
          With lblKesalahan
              .BackColor = Color.Transparent
              .ForeColor = Color.LimeGreen
              .Text = "Editor Data Buku"
          End With
      End If
  End If

Accepted

answered on 17 Oct 2010, 08:32 AM

Hello again,

Please take a look at the following example:

Imports System

Imports System.ComponentModel

Imports System.Windows.Forms

Imports Telerik.WinControls.UI

Partial Public Class Form1

Inherits Form

Private WithEvents RadGridView1 As RadGridView

Public Sub New()

InitializeComponent()

Me.Controls.Add(InlineAssignHelper(RadGridView1, New RadGridView()))

RadGridView1.Dock = DockStyle.Fill

End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Me.RadGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill

Me.RadGridView1.DataSource = New ProductsCollection(1000)

End Sub

Private Sub radGridView1_DataBindingComplete(ByVal sender As Object, ByVal e As GridViewBindingCompleteEventArgs) Handles RadGridView1.DataBindingComplete

'set the original columns visibility to false

RadGridView1.Columns("BuyerId").IsVisible = False

'create the new comboboxcolumn

Dim column = New GridViewComboBoxColumn("SomeComboboxColumn", "SomeComboboxColumn")

'set the data source for the combobox column

column.DataSource = New BuyersCollection(10, 10)

column.ValueMember = "Id"

column.FieldName = "BuyerId"

column.DisplayMember = "Name"

Me.RadGridView1.Columns.Add(column)

Me.RadGridView1.BestFitColumns()

End Sub

Private Shared Function InlineAssignHelper(Of T)(ByRef target As T, ByVal value As T) As T

target = value

Return value

End Function

End Class

#Region "Helpers"

Public Class Product

Public Property Id() As Integer

Get

Return m_Id

End Get

Set(ByVal value As Integer)

m_Id = Value

End Set

End Property

Private m_Id As Integer

Public Property BuyerId() As Integer

Get

Return m_BuyerId

End Get

Set(ByVal value As Integer)

m_BuyerId = Value

End Set

End Property

Private m_BuyerId As Integer

Public Sub New(ByVal id As Integer, ByVal buyerId As Integer)

Me.Id = id

Me.BuyerId = buyerId

End Sub

End Class

Public Class Buyer

Public Property Id() As Integer

Get

Return m_Id

End Get

Set(ByVal value As Integer)

m_Id = Value

End Set

End Property

Private m_Id As Integer

Public Property Name() As String

Get

Return m_Name

End Get

Set(ByVal value As String)

m_Name = Value

End Set

End Property

Private m_Name As String

Public Sub New(ByVal id As Integer, ByVal name As String)

Me.Id = id

Me.Name = name

End Sub

End Class

Public Class ProductsCollection

Inherits BindingList(Of Product)

Public Sub New(ByVal noItems As Integer)

For i As Integer = 0 To noItems - 1

Me.Add(New Product(i, i + 10))

Next

End Sub

End Class

Public Class BuyersCollection

Inherits BindingList(Of Buyer)

Public Sub New(ByVal startIndex As Integer, ByVal lenght As Integer)

For i As Integer = 0 To 9

Me.Add(New Buyer(i + 10, "Buyer" + (i + 1).ToString()))

Next

End Sub

End Class

#End Region

Please let me know if you need something different, of if you have any other questions or comments, please let me know,

Best Regards,
Emanuel Varga