Handling events from controls within custom controls
Hi,
I have created a custom control that behaves similar to a placeholder control. In the Render control I simply render the sub-controls that have been programiatically added, like this:
protected override void Render(HtmlTextWriter writer)
{
foreach (Control control in Controls)
{
control.RenderControl(writer);
} ...This is fine. I can programatically add a button with an event handler to this control in the code behind for my ASPX page, and it works with no problem. However, if I add a "sub-control" to my custom control, and then programatically add buttons etc to that control, my event handlers are never fired. Can someone tell me what I need to do. Here's my non-working custom control :-
public class MattsControl : System.Web.UI.WebControls.WebControl, INamingContainer { private MattsSubControl SubControl; public MattsControl() { SubControl = new MattsSubControl(); } protected override void Render(HtmlTextWriter writer) { foreach (Control control in Controls) { control.RenderControl(writer); } SubControl.RenderControl(writer); } } public class MattsSubControl : System.Web.UI.WebControls.WebControl, INamingContainer { protected override void Render(HtmlTextWriter writer) { foreach (Control control in Controls) { // Any controls added to "SubControl" wil render, but their events are ignored! control.RenderControl(writer); } } }I am attempting to use this class like this in the code behind of my web form - in this example the btn_Click method never fires :-Button btn = new Button(); // .. code ommitted to set the ID and text btn.Click += new EventHandler(btn_Click); MattsControl1.SubControl.Controls.Add(btn);I'm sure its simple - I just don't know what I need to do!
Matt Woberts
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MattWoberts
9/10/2007 11:06:43 AM
asp.net.custom-server-controls
3498 articles. 
0 followers.
4 Replies
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I think you should write a CompositeControl rather than a WebControl. This issue should get resolved as soon as you inherit from CompositeControl and add controls to Controls collection in CreateChildControls method.
Check out the below example:
http://msdn2.microsoft.com/en-us/library/3257x3ea.aspx
- Sujit
Dont forget to click "Mark as Answer" on the post that helped you.
This credits that member, earns you a point and marks your thread as Resolved so we will all know you have been helped.
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sujitm
9/10/2007 11:40:37 AM
I have the same problem and that link didn't help at all, why can't I write the code that I want to be executed when users click a buttom from the class that defines it???
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nmorales
9/10/2007 12:56:25 PM
Thanks for the response. Unfortunately, it needs to be a custom control, because I need to allow the users of the control to be able to add their own controls (buttons etc). So it needs to have behavour that is similar to something like a placeholder.
EDIT: I realised after posting this that making it a compisite control would probably not remove this functionality. So I tried making the changes (turned my main class into a composite control), and it didn't make any difference.
Matt Woberts
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MattWoberts
9/10/2007 1:24:39 PM
Aha! Fixed it
The solution was not to make it a composite control, but I needed to make sure that my SubControl was added to my main control's list of controls, in order to allow events to bubble up nicely. This is done by overriding the CreateChildControls method. Thanks for sajit for sending me to that link with the information I needed! Heres the full code which is working nicely:-
[ParseChildren(true)]
public class MattsControl : WebControl, INamingContainer
{
public MattsSubControl SubControl;
public MattsControl()
{
SubControl = new MattsSubControl();
}
protected override void Render(HtmlTextWriter writer)
{
foreach (Control control in Controls)
{
control.RenderControl(writer);
}
}
protected override void CreateChildControls()
{
Controls.Clear();
this.Controls.Add(SubControl);
}
}
public class MattsSubControl : WebControl, INamingContainer
{
protected override void Render(HtmlTextWriter writer)
{
foreach (Control control in Controls)
{
control.RenderControl(writer);
}
}
}
Matt Woberts
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0 |
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MattWoberts
9/10/2007 1:52:40 PM
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