Handling events of controls created at runtime

[Klaus Jensen]

Subject: Handling events of controls created at runtime

I need to render some buttons at runtime based on a database, tie events to
them, and handle the events when they fire.

In Page_Load I create the controls (for example a delete-button), add them
to a placeholder, add eventhandlers, and the controls are displayed as
expected.

I click the button, the event fires as I wanted, I delete a record in the
database, and now I want to re-render the entire thing to reflect the
changes in the database.

This is where my problems start...

If I clear the placeholder and render the buttons/controls again, the
eventhandlers work. I click a button, no event is fired.
I currently work around this by response.redirecting to the page again - and
this created an illusion of what I want, but is not the right way to handle
this.
Please note, that this is a simplified example - obviously there was no need
to generate controls at runtime, if it could be solved by using a datagrid
or something like that. :)

[Yuriy Solodkyy]

Hi,

Do you assign ID to your controls when you create them? If you don't, try
assigning ID in a way that button for the same row has the same ID after
you clear placheholder an add controls back. When you clear placeholder
and add controls back, they get new IDs. However, on the next postback they
get their old IDs.

See http://www.singingeels.com/Articles/...in_ASPNET.aspx.
I think I described the problem you expirience.

-yuriy

Subject: Handling events of controls created at runtime

I need to render some buttons at runtime based on a database, tie
events to them, and handle the events when they fire.

In Page_Load I create the controls (for example a delete-button), add
them to a placeholder, add eventhandlers, and the controls are
displayed as expected.

I click the button, the event fires as I wanted, I delete a record in
the database, and now I want to re-render the entire thing to reflect
the changes in the database.

This is where my problems start...

If I clear the placeholder and render the buttons/controls again, the
eventhandlers work. I click a button, no event is fired.

I currently work around this by response.redirecting to the page again
- and this created an illusion of what I want, but is not the right
way to handle this.

Please note, that this is a simplified example - obviously there was
no need to generate controls at runtime, if it could be solved by
using a datagrid or something like that. :)