[thelist] .NET 2.0: Adding Multiple Controls
Casey Crookston
caseyc at IntelliSoftmn.com
Thu Apr 12 08:22:52 CDT 2007
Ok, I'll give that a whirl. On post back, if I re-create the first and
then create the second, will viewstate remember the values of each item?
One way to find out, I guess. Should I be caching the user controls?
I'll go give this a shot and report back.
Casey
-----Original Message-----
From: Peter Brunone
Sounds like you're doing a postback each time, at which point the
controls you created during the previous postback are not remembered.
What if you were to keep a record of how many new rows you have, and
loop to create that many plus one?
----------------------------------------
From: "Casey Crookston" caseyc at IntelliSoftmn.com
Ok, here's the (simple) concept:
A user will be manually entering rows of data. We don't know ahead of
time how many rows he'll be adding. Each row consists of a drop down, a
text field and a label. I have made a simple little user control which
contains these items.
At the right time, the first instance of the control is added to a
placeholder.
Sub AddLineItemRow()
ViewState("ItemCount") = ViewState("ItemCount") + 1
Dim ctlLineItems As Control =
LoadControl("admin_distribute_points_line_items.ascx")
ctlLineItems.ID = "ctlLineItems" & ViewState("ItemCount")
' populate drop down
plhLineItems.Controls.Add(ctlLineItems)
End Sub
Here's the catch. Outside of the control, I have a button with text
"Add New Row". When this button is clicked, we re-execute
AddLineItemRow(). This works, BUT, the previous row vanishes. In other
words, on the button click, a new Control is added with the ID of
ctlLineItems2, but ctlLineItems1 is gone. I need it to stay there.
What am I doing wrong. And, is there a better way to do this?
Thanks, Casey
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