Dynamic gridview columns event problem
- by ropstah
Hi,
i have a GridView (selectable) in which I want to generate a dynamic GridView in a new row BELOW the selected row.
I can add the row and gridview dynamically in the Gridview1 PreRender event. I need to use this event because:
_OnDataBound is not called on every postback (same for _OnRowDataBound)
_OnInit is not possible because the 'Inner table' for the Gridview is added after Init
_OnLoad is not possible because the 'selected' row is not selected yet.
I can add the columns to the dynamic GridView based on my ITemplate class.
But now the button events won't fire.... Any suggestions?
The dynamic adding of the gridview:
Private Sub GridView1_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.PreRender
Dim g As GridView = sender
g.DataBind()
If g.SelectedRow IsNot Nothing AndAlso g.Controls.Count > 0 Then
Dim t As Table = g.Controls(0)
Dim r As New GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal)
Dim c As New TableCell
Dim visibleColumnCount As Integer = 0
For Each d As DataControlField In g.Columns
If d.Visible Then
visibleColumnCount += 1
End If
Next
c.ColumnSpan = visibleColumnCount
Dim ph As New PlaceHolder
ph.Controls.Add(CreateStockGrid(g.SelectedDataKey.Value))
c.Controls.Add(ph)
r.Cells.Add(c)
t.Rows.AddAt(g.SelectedRow.RowIndex + 2, r)
End If
End Sub
Private Function CreateStockGrid(ByVal PnmAutoKey As String) As GridView
Dim col As Interfaces.esColumnMetadata
Dim coll As New BLL.ViewStmCollection
Dim entity As New BLL.ViewStm
Dim query As BLL.ViewStmQuery = coll.Query
Me._gridStock.AutoGenerateColumns = False
Dim buttonf As New TemplateField()
buttonf.ItemTemplate = New QuantityTemplateField(ListItemType.Item, "", "Button")
buttonf.HeaderTemplate = New QuantityTemplateField(ListItemType.Header, "", "Button")
buttonf.EditItemTemplate = New QuantityTemplateField(ListItemType.EditItem, "", "Button")
Me._gridStock.Columns.Add(buttonf)
For Each col In coll.es.Meta.Columns
Dim headerf As New QuantityTemplateField(ListItemType.Header, col.PropertyName, col.Type.Name)
Dim itemf As New QuantityTemplateField(ListItemType.Item, col.PropertyName, col.Type.Name)
Dim editf As New QuantityTemplateField(ListItemType.EditItem, col.PropertyName, col.Type.Name)
Dim f As New TemplateField()
f.HeaderTemplate = headerf
f.ItemTemplate = itemf
f.EditItemTemplate = editf
Me._gridStock.Columns.Add(f)
Next
query.Where(query.PnmAutoKey.Equal(PnmAutoKey))
coll.LoadAll()
Me._gridStock.ID = "gvChild"
Me._gridStock.DataSource = coll
AddHandler Me._gridStock.RowCommand, AddressOf Me.gv_RowCommand
Me._gridStock.DataBind()
Return Me._gridStock
End Function
The ITemplate class:
Public Class QuantityTemplateField : Implements ITemplate
Private _itemType As ListItemType
Private _fieldName As String
Private _infoType As String
Public Sub New(ByVal ItemType As ListItemType, ByVal FieldName As String, ByVal InfoType As String)
Me._itemType = ItemType
Me._fieldName = FieldName
Me._infoType = InfoType
End Sub
Public Sub InstantiateIn(ByVal container As System.Web.UI.Control) Implements System.Web.UI.ITemplate.InstantiateIn
Select Case Me._itemType
Case ListItemType.Header
Dim l As New Literal
l.Text = "<b>" & Me._fieldName & "</b>"
container.Controls.Add(l)
Case ListItemType.Item
Select Case Me._infoType
Case "Button"
Dim ib As New Button()
Dim eb As New Button()
ib.ID = "InsertButton"
eb.ID = "EditButton"
ib.Text = "Insert"
eb.Text = "Edit"
ib.CommandName = "Edit"
eb.CommandName = "Edit"
AddHandler ib.Click, AddressOf Me.InsertButton_OnClick
AddHandler eb.Click, AddressOf Me.EditButton_OnClick
container.Controls.Add(ib)
container.Controls.Add(eb)
Case Else
Dim l As New Label
l.ID = Me._fieldName
l.Text = ""
AddHandler l.DataBinding, AddressOf Me.OnDataBinding
container.Controls.Add(l)
End Select
Case ListItemType.EditItem
Select Case Me._infoType
Case "Button"
Dim b As New Button
b.ID = "UpdateButton"
b.Text = "Update"
b.CommandName = "Update"
b.OnClientClick = "return confirm('Sure?')"
container.Controls.Add(b)
Case Else
Dim t As New TextBox
t.ID = Me._fieldName
AddHandler t.DataBinding, AddressOf Me.OnDataBinding
container.Controls.Add(t)
End Select
End Select
End Sub
Private Sub InsertButton_OnClick(ByVal sender As Object, ByVal e As EventArgs)
Console.WriteLine("insert click")
End Sub
Private Sub EditButton_OnClick(ByVal sender As Object, ByVal e As EventArgs)
Console.WriteLine("edit click")
End Sub
Private Sub OnDataBinding(ByVal sender As Object, ByVal e As EventArgs)
Dim boundValue As Object = Nothing
Dim ctrl As Control = sender
Dim dataItemContainer As IDataItemContainer = ctrl.NamingContainer
boundValue = DataBinder.Eval(dataItemContainer.DataItem, Me._fieldName)
Select Case Me._itemType
Case ListItemType.Item
Dim fieldLiteral As Label = sender
fieldLiteral.Text = boundValue.ToString()
Case ListItemType.EditItem
Dim fieldTextbox As TextBox = sender
fieldTextbox.Text = boundValue.ToString()
End Select
End Sub
End Class
