EditCommand (Datagrid nested in a Data Repeater)

[reflektmedia]

I have a Datarepeater (parent) who has a datagrid(child) for each item
of the repeater. I have the Add/Insert, and Delete working correctly
in the datagrid. The problem occurs when clicking EDIT in the
datagrid(child).

I can debug and see that it is correctly going into my EditCommand
event (see below) and the EditItemIndex is being set. However as soon
as the data is rebound/refreshed the datarepeater(parent) is refreshed
and the EditItemIndex is reset back to -1.

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Protected Sub dgChild_EditCommand(ByVal source As Object, ByVal
e As System.Web.UI.WebControls.DataGridCommandEventArgs)

Dim myInnerDG As DataGrid = CType(source, DataGrid)
myInnerDG.EditItemIndex = e.Item.ItemIndex

RefreshData()

End Sub

 

[Ahmed Fouad]

As of my understanding, rebinding the parent repeater causes any nested
controls (including nested DataGrid) to reinstantiate. This is the reason
why the EditItemIndex property of the child grid resets to -1 (the default).
You need to store the EditItemIndex in a class level variable and then use
this variable in the ItemCreated event of the Repeater (parent) control.
Something like the following should do the trick:

' declare class level variables to preserve nested state
Private m_childGridIndex As Integer ' allows us to locate instance of
the child grid for which EditCommand was last fired
Private m_editItemIndex As Integer ' you already know whats this
for....

Protected Sub dgChild_EditCommand(. . .)
Dim myInnerDG As DataGrid = CType(source, DataGrid)


' no need to do that because it will be reset to -1 after invoking
RefreshData() method
'myInnerDG.EditItemIndex = e.Item.ItemIndex

' The following lines will rescue our precious indices to be used in
Repeater's ItemCreated event handler...
m_childGridIndex = CType(myInnerDG.NamingContainer,
RepeaterItem).ItemIndex
m_editItemIndex = e.Item.ItemIndex

RefreshData()
End Sub

Private Sub Repeater_ItemCreated(. . .)
If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType =
ListItemType.AlternatingItem Then
If e.Item.ItemIndex = m_childGridIndex Then
Dim dgChild As DataGrid =
DirectCast(e.Item.FindControl("dgChild"), DataGrid)
dgChild.EditItemIndex = m_editItemIndex
End If
End If
End Sub

 

[reflektmedia]

Ahmed, Thank you very much for your tips

I got it working after your suggestions.

I was headed down the same path before I got your suggestion, I errored
on these topics:
1) I was trying to set the EditItemIndex in the Repeaters_ItemDataBound
instead of Repeaters_ItemCreated.
2) I was trying to check to see which datagrid to edit by storing the
dg.ClientID instead of the ChildGridIndex. This worked fine while in
_ItemDataBound but once it was moved to _ItemCreated the ClientID was
not unique.

I really appreciate the time you took to answer this question. I have
seen a lot of other old posts with the same question but no answer.