How to handle Dynamic Controls within User Controls

[Michael Ramey]

Howdy, I think I have a good question!

I'm creating a usercontrol, and within this usercontrol, I'm dynamically
creating controls (imagebuttons to be exact), that the user can click on
which will cause a postback to occur.

My problem is, I can't seem to be able to get the handlers to work within
the user control, to determine which control has been clicked, and what to
do with it from there.

I want these events to be handled within the user control itself, and not
the page that has the user control.

Here is what I've been doing:

'I'm adding this imagebutton to a tablecell I'm dynamically creating as
well, for simplicity i'm not showing that this code is part of a for each
loop, and it can be ran many times...

Dim dImage as ImageButton = new ImageButton

AddHandler dImage.click, AddressOf DeleteButton_Cl ick
dImage.imageurl = "../images/delete.gif"
dImage.tooltip = "Delete this Item"
tblcellDelete.C ontrols.Add(dIm age) 'tcDelete is a TableCell
tblRow.Controls .Add(tcDelete) 'trow is a TableRow
tblShow.Control s.Add(trow) 'tblShow is a Table

Then I create the event handler in the user control

Sub DeleteButton_Cl ick(ByVal sender As Object, ByVal e As
System.Web.UI.I mageClickEventA rgs)
Response.Write( "clicked an image?")
End Sub

For now I'm just using Response.write with a breakpoint on that line to see
if that code executes. Unfortunately the DeleteButton_Cl ick Sub is never
called, the page just posts back. Can someone tell me the proper way to
handle events for dynamically created controls within user controls?

Thanks!
--Michael

[Felbrigg]

I've done a similar thing myself, emphasis on SIMILAR.
I fix my similar problem I had to reload all of the dynamic controls on each
postback, the viewstate info then allowed the events to take place.

Hope that helps
"Michael Ramey" <raterus@localh ost> wrote in message
news:Ox******** ******@TK2MSFTN GP11.phx.gbl...

Howdy, I think I have a good question!

I'm creating a usercontrol, and within this usercontrol, I'm dynamically
creating controls (imagebuttons to be exact), that the user can click on
which will cause a postback to occur.

My problem is, I can't seem to be able to get the handlers to work within
the user control, to determine which control has been clicked, and what to
do with it from there.

I want these events to be handled within the user control itself, and not
the page that has the user control.

Here is what I've been doing:

'I'm adding this imagebutton to a tablecell I'm dynamically creating as
well, for simplicity i'm not showing that this code is part of a for each
loop, and it can be ran many times...

Dim dImage as ImageButton = new ImageButton

AddHandler dImage.click, AddressOf DeleteButton_Cl ick
dImage.imageurl = "../images/delete.gif"
dImage.tooltip = "Delete this Item"
tblcellDelete.C ontrols.Add(dIm age) 'tcDelete is a TableCell
tblRow.Controls .Add(tcDelete) 'trow is a TableRow
tblShow.Control s.Add(trow) 'tblShow is a Table

Then I create the event handler in the user control

Sub DeleteButton_Cl ick(ByVal sender As Object, ByVal e As
System.Web.UI.I mageClickEventA rgs)
Response.Write( "clicked an image?")
End Sub

For now I'm just using Response.write with a breakpoint on that line to see if that code executes. Unfortunately the DeleteButton_Cl ick Sub is never
called, the page just posts back. Can someone tell me the proper way to
handle events for dynamically created controls within user controls?

Thanks!
--Michael

[Michael Ramey]

Worked great, just one thing, the button i'm writing the event for is a
"delete" button, so on a postback, I wouldn't want it to appear again. I
suppose I can search and delete the control before it is rendered again.
Thanks for the info, it did help.

"Felbrigg" <so*****@micros oft.com> wrote in message
news:Od******** ********@tk2msf tngp13.phx.gbl. ..

I've done a similar thing myself, emphasis on SIMILAR.
I fix my similar problem I had to reload all of the dynamic controls on each postback, the viewstate info then allowed the events to take place.

Hope that helps
"Michael Ramey" <raterus@localh ost> wrote in message
news:Ox******** ******@TK2MSFTN GP11.phx.gbl...

Howdy, I think I have a good question!

I'm creating a usercontrol, and within this usercontrol, I'm dynamically
creating controls (imagebuttons to be exact), that the user can click on
which will cause a postback to occur.

My problem is, I can't seem to be able to get the handlers to work within the user control, to determine which control has been clicked, and what to do with it from there.

I want these events to be handled within the user control itself, and not the page that has the user control.

Here is what I've been doing:

'I'm adding this imagebutton to a tablecell I'm dynamically creating as
well, for simplicity i'm not showing that this code is part of a for each loop, and it can be ran many times...

Dim dImage as ImageButton = new ImageButton

AddHandler dImage.click, AddressOf DeleteButton_Cl ick
dImage.imageurl = "../images/delete.gif"
dImage.tooltip = "Delete this Item"
tblcellDelete.C ontrols.Add(dIm age) 'tcDelete is a TableCell
tblRow.Controls .Add(tcDelete) 'trow is a TableRow
tblShow.Control s.Add(trow) 'tblShow is a Table

Then I create the event handler in the user control

Sub DeleteButton_Cl ick(ByVal sender As Object, ByVal e As
System.Web.UI.I mageClickEventA rgs)
Response.Write( "clicked an image?")
End Sub

For now I'm just using Response.write with a breakpoint on that line to

see

if that code executes. Unfortunately the DeleteButton_Cl ick Sub is never called, the page just posts back. Can someone tell me the proper way to
handle events for dynamically created controls within user controls?

Thanks!
--Michael