Iterate over rows/checkboxes in a RadGrid

Question

I have a Telerik RadGrid with a GridTemplateColumn that contains a checkbox, as follows:

<telerik:GridTemplateColumn HeaderText="MINE" UniqueName="MyTemplateColumn">
     <ItemTemplate>
          <asp:CheckBox id="MyCheckBox" runat="server"></asp:CheckBox>
     </ItemTemplate>
</telerik:GridTemplateColumn>

I want to set the box to be "checked" based on a value read from the database. I could handle the ItemDataBound event and read the database when each row is bound, but that results in n lookups. Instead, I want to handle DataBound, and then set all the values at once. So, in that method, I want code like this:

// read all values from database first, then...
foreach(var chkbox in MyRadGrid.MasterTableView.Columns.FindByUniqueName("MyTemplateColumn").FindControl("MyCheckBox")) {
    chkbox.Checked = oneValue;
}

That doesn't work, because FindControl isn't a method of GridColumn, and it won't generate an iterable list of the checkboxes. What is the correct way to iterate through the checkboxes in the template column? Thanks!

Honniball

Answer 1

Telerik got back to me on their forums with the answer, as follows:

foreach (GridDataItem item in MyRadGrid.MasterTableView.Items) 
{ 
  CheckBox chk = (CheckBox)item.FindControl("MyCheckBox");
  // Set the value here
}

Hope this is useful for someone!

Honniball

Answer 2

I am having the same issue.. this was how I did it..

'Created a local hashtable to use now and otherwise

Private _GroupMembers As New Hashtable

'Loaded it up on page load Private Function GetMembers() As Boolean

    Try

        Dim da As New DataAccess
        Dim ht As New Hashtable
        Dim i As Int16 = 0

        ht.Add("CAC", Session("cac"))
        ht.Add("GroupID", _GroupID)
        If da.GetData("rap_spGetGroupMemberList", ht) = True Then
            If da.SQLDataRows.HasRows Then
                While da.SQLDataRows.Read()
                    i = i + 1
                    _GroupMembers.Add(i, da.SQLDataRows("UserID"))
                End While
            End If
            da.SQLDataRows.Dispose()
        End If

        da = Nothing

    Catch ex As Exception
        Console.Write(ex.Message)
    End Try
End Function

'Check for contains Protected Sub RadGrid2_ItemDataBound(ByVal sender As Object, ByVal e As Telerik.Web.UI.GridItemEventArgs) Handles RadGrid2.ItemDataBound

    Try

        If e.Item.IsDataBound Then
            If Not e.Item.DataItem("UserID") Is Nothing Then
                If Not IsDBNull(e.Item.DataItem("UserID")) Then
                    Dim UserID As Long = e.Item.DataItem("UserID")
                    If _GroupMembers.ContainsValue(UserID) Then
                        e.Item.Selected = True
                    End If
                End If
            End If
        End If

    Catch ex As Exception
        Console.Write(ex.Message)
    End Try
End Sub

Deuteragonist