fakir420
asked on
How to get reference to nested DataGrid
I have a nested datagrid for show details info. In the EditCommand prodedure I have the following code to bind the datagrid
Private Sub dgMaster_ItemDataBound(ByV
Dim drv As DataRowView = e.Item.DataItem
Dim dgChild As DataGrid = e.Item.Cells(9).FindContro
dgChild.DataSource = drv.CreateChildView("ID")
dgChild.DataBind()
End Sub
I cannot get the reference to the "dgDetails" grid, dgChild is always nothing. I've also tried placing this code in the ItemDataBound event procedure with the same results. Datagrid code is listed below, any help is greatly appreciated.
<asp:datagrid id="dgMaster" style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 56px" runat="server"
Visible="False" AllowSorting="True" AllowPaging="True" PageSize="25" Width="576px" ShowFooter="True" AutoGenerateColumns="False
<Columns>
<asp:BoundColumn DataField="id" ReadOnly="True" HeaderText="ID"></asp:Boun
<asp:BoundColumn DataField="Part#" ReadOnly="True" HeaderText="Part #"></asp:BoundColumn>
<asp:BoundColumn DataField="SerialNum" ReadOnly="True" HeaderText="SerialNum"></a
<asp:BoundColumn DataField="WorkOrder" ReadOnly="True" HeaderText="WorkOrder"></a
<asp:BoundColumn DataField="Batch#" ReadOnly="True" HeaderText="Batch#"></asp:
<asp:BoundColumn DataField="Description" ReadOnly="True" HeaderText="Description"><
<asp:BoundColumn DataField="Pass/Fail?" ReadOnly="True" HeaderText="Pass/Fail?"></
<asp:BoundColumn DataField="NumofFreqsTeste
<asp:BoundColumn DataField="NewStartTime" ReadOnly="True" HeaderText="NewStartTime">
<asp:TemplateColumn>
<ItemTemplate>
<asp:LinkButton runat="server" Text="Show Details" CommandName="Edit" CausesValidation="false"><
</ItemTemplate>
<EditItemTemplate>
<asp:DataGrid id="dgDetails" runat="server" ShowHeader="True">
<Columns>
<asp:BoundColumn DataField="field_name" HeaderText="Field Name"></asp:BoundColumn>
<asp:BoundColumn DataField="item_data" HeaderText="Data"></asp:Bo
</Columns>
</asp:DataGrid>
</EditItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid>
Private Sub dgMaster_ItemDataBound(ByV
Dim drv As DataRowView = e.Item.DataItem
Dim dgChild As DataGrid = e.Item.Cells(9).FindContro
dgChild.DataSource = drv.CreateChildView("ID")
dgChild.DataBind()
End Sub
I cannot get the reference to the "dgDetails" grid, dgChild is always nothing. I've also tried placing this code in the ItemDataBound event procedure with the same results. Datagrid code is listed below, any help is greatly appreciated.
<asp:datagrid id="dgMaster" style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 56px" runat="server"
Visible="False" AllowSorting="True" AllowPaging="True" PageSize="25" Width="576px" ShowFooter="True" AutoGenerateColumns="False
<Columns>
<asp:BoundColumn DataField="id" ReadOnly="True" HeaderText="ID"></asp:Boun
<asp:BoundColumn DataField="Part#" ReadOnly="True" HeaderText="Part #"></asp:BoundColumn>
<asp:BoundColumn DataField="SerialNum" ReadOnly="True" HeaderText="SerialNum"></a
<asp:BoundColumn DataField="WorkOrder" ReadOnly="True" HeaderText="WorkOrder"></a
<asp:BoundColumn DataField="Batch#" ReadOnly="True" HeaderText="Batch#"></asp:
<asp:BoundColumn DataField="Description" ReadOnly="True" HeaderText="Description"><
<asp:BoundColumn DataField="Pass/Fail?" ReadOnly="True" HeaderText="Pass/Fail?"></
<asp:BoundColumn DataField="NumofFreqsTeste
<asp:BoundColumn DataField="NewStartTime" ReadOnly="True" HeaderText="NewStartTime">
<asp:TemplateColumn>
<ItemTemplate>
<asp:LinkButton runat="server" Text="Show Details" CommandName="Edit" CausesValidation="false"><
</ItemTemplate>
<EditItemTemplate>
<asp:DataGrid id="dgDetails" runat="server" ShowHeader="True">
<Columns>
<asp:BoundColumn DataField="field_name" HeaderText="Field Name"></asp:BoundColumn>
<asp:BoundColumn DataField="item_data" HeaderText="Data"></asp:Bo
</Columns>
</asp:DataGrid>
</EditItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid>
Try:
Dim dgChild As DataGrid = e.Item.Cells(9).Controls(0
You may want to put a break point at this line and then use the immediate pane to see how many controls the cell has:
? e.Item.Cells(9).Controls.C
If it is more than one, check the id of each by its index and see what you get.
John
Dim dgChild As DataGrid = e.Item.Cells(9).Controls(0
You may want to put a break point at this line and then use the immediate pane to see how many controls the cell has:
? e.Item.Cells(9).Controls.C
If it is more than one, check the id of each by its index and see what you get.
John
ASKER
I've tried checking the controls using the imediate pane, there are 3 literal controls? I don't have any literals in the entire project which is why I am confused.
ASKER
I've tried the FindControlsByID using the below code
Private Sub dgMaster_ItemDataBound(ByV
If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingIt
Dim drv As DataRowView = e.Item.DataItem
Dim dgChild As DataGrid = CType(FindControlsByID(sen
dgChild.DataSource = drv.CreateChildView("ID")
dgChild.DataBind()
End If
End Sub
I get 'Index was outside the bounds of the array' since the returned value is nothing. I don't have this control referenced anywhere in the codebehind, only in html. Is there some trick to finding it?
Private Sub dgMaster_ItemDataBound(ByV
If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingIt
Dim drv As DataRowView = e.Item.DataItem
Dim dgChild As DataGrid = CType(FindControlsByID(sen
dgChild.DataSource = drv.CreateChildView("ID")
dgChild.DataBind()
End If
End Sub
I get 'Index was outside the bounds of the array' since the returned value is nothing. I don't have this control referenced anywhere in the codebehind, only in html. Is there some trick to finding it?
I know that literal controls in that situation are not unusual. But I do not know exactly why they get added (by ASP.NET). Do this for each of the controls in the cell in the immediate pane to see which index, if any, represnts the grid.
? e.Item.Cells(9).Controls(x
where x = the index. If the count is 4, then try the above with 0, 1, 2 and 3 and see what id each has (if any).
John
? e.Item.Cells(9).Controls(x
where x = the index. If the count is 4, then try the above with 0, 1, 2 and 3 and see what id each has (if any).
John
Use:
Dim dgChild As DataGrid = CType(FindControlsByID(e.I
or:
Dim dgChild As DataGrid = CType(FindControlsByID(e.I
instead of:
Dim dgChild As DataGrid = CType(FindControlsByID(sen
Dim dgChild As DataGrid = CType(FindControlsByID(e.I
or:
Dim dgChild As DataGrid = CType(FindControlsByID(e.I
instead of:
Dim dgChild As DataGrid = CType(FindControlsByID(sen
ASKER
?e.Item.Cells(9).Controls(
Nothing
?e.Item.Cells(9).Controls(
Nothing
?e.Item.Cells(9).Controls(
Nothing
I've tried this over and over, even obtaining a reference to the dgMaster datagrid and trying to search it. Also e.Item.DataItem is nothing, although I can get the text of other cells by e.Item.Cells(8).Text and e.Item.ItemIndex is the correct index value. This is really starting to drive me nuts as I've tried everything I can think of 3 times with the same results - nothing.
Nothing
?e.Item.Cells(9).Controls(
Nothing
?e.Item.Cells(9).Controls(
Nothing
I've tried this over and over, even obtaining a reference to the dgMaster datagrid and trying to search it. Also e.Item.DataItem is nothing, although I can get the text of other cells by e.Item.Cells(8).Text and e.Item.ItemIndex is the correct index value. This is really starting to drive me nuts as I've tried everything I can think of 3 times with the same results - nothing.
ASKER
Still not luck with the FindControlsByID method. I tried both versions of the code posted above with the same results. It's like the control doesn't exist...
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ASKER
I tried to code below - notice that it is now in the EditCommand - and still get the same thing. Is there something else I need to do to load the EditItemTemplate?
Private Sub dgMaster_EditCommand(ByVal
If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingIt
dgMaster.EditItemIndex = e.Item.ItemIndex
Dim drv As DataRowView = e.Item.DataItem
Dim dgChild As DataGrid = CType(FindControlsByID(e.I
dgChild.DataSource = drv.CreateChildView("ID")
dgChild.DataBind()
End If
End Sub
Private Sub dgMaster_EditCommand(ByVal
If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingIt
dgMaster.EditItemIndex = e.Item.ItemIndex
Dim drv As DataRowView = e.Item.DataItem
Dim dgChild As DataGrid = CType(FindControlsByID(e.I
dgChild.DataSource = drv.CreateChildView("ID")
dgChild.DataBind()
End If
End Sub
ASKER
I finally got this working! Justin_W is correct in that the EditItemTemplate was not loaded when I was trying to do reference the control in it. After a little investigation, it seems that the EditItemTemplate will not be invoked until the next databind on the datagrid. The combination of the two procedures below works!
Private Sub dgMaster_EditCommand(ByVal
dgMaster.EditItemIndex = e.Item.ItemIndex
BindData()
End Sub
Private Sub dgMaster_ItemDataBound(ByV
If dgMaster.EditItemIndex <> -1 And e.Item.ItemIndex = dgMaster.EditItemIndex Then
'we are in edit mode and on the row being edited
Dim drv As DataRowView = e.Item.DataItem
Dim dgChild As DataGrid = e.Item.Cells(9).FindContro
dgChild.DataSource = drv.CreateChildView("ID")
dgChild.DataBind()
End If
End Sub
Thank you both for your comments, I am going to split the points, but Justin_W get more since the comment about the EditItemTemplate pointed me in the right direction.
Private Sub dgMaster_EditCommand(ByVal
dgMaster.EditItemIndex = e.Item.ItemIndex
BindData()
End Sub
Private Sub dgMaster_ItemDataBound(ByV
If dgMaster.EditItemIndex <> -1 And e.Item.ItemIndex = dgMaster.EditItemIndex Then
'we are in edit mode and on the row being edited
Dim drv As DataRowView = e.Item.DataItem
Dim dgChild As DataGrid = e.Item.Cells(9).FindContro
dgChild.DataSource = drv.CreateChildView("ID")
dgChild.DataBind()
End If
End Sub
Thank you both for your comments, I am going to split the points, but Justin_W get more since the comment about the EditItemTemplate pointed me in the right direction.
https://www.experts-exchange.com/questions/21043976/footerTemplate-textbox-values.html
It contains the "FindControlsByID" utility method, which you can use to find _all_ controls with a specified non-unique id, no matter where they are in the page. Then you can just look at the UniqueID to find out where your child grid really is.