UserControl Events Not Firing with Dynamically Created Button Control


J

jasinx

When I run this code it creates a button on an .aspx page. When I
click the button it seems to fire the events but I'm unable to capture
them in the function in the ascx codebehind. Any help? Thank Jason.

start ASCX codebehind -------------------------------------------

public partial class WebUserControl1 : System.Web.UI.UserControl
{

Button btn = new Button();

protected override void OnInit(EventArgs e)
{
btn.Text = "this works";
btn.ID = this.UniqueID + "$btn";
btn.Click += new EventHandler(btn_Click);
base.OnInit(e);
}

protected override void Render(HtmlTextWriter writer)
{

btn.RenderControl(writer);
base.Render(writer);
}

void btn_Click(object sender, EventArgs e)
{
throw new Exception("The method or operation is not
implemented.");
}

}

End ASCX codebehind -------------------------------------------

Start ASPX Codebehind -------------------------------------------

public partial class _Default : System.Web.UI.Page
{
WebUserControl1 ctrl;
protected void Page_Load(object sender, EventArgs e)
{
ctrl =
(WebUserControl1)LoadControl("WebUserControl1.ascx");
ctrl.ID = this.UniqueID;
Page.FindControl("divMain").Controls.Add(ctrl);

}
}

End ASPX Codebehind -------------------------------------------
 
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G

gover

I'm quite onclear on this but i remember reading that when you re-create
user on each postback , the events dont get fired because the old button is
gone, and there is a new button created in its place. Try changin the code
to
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
if(!IsPostBack)
{
btn.Text = "this works";
btn.ID = this.UniqueID + "$btn";
btn.Click += new EventHandler(btn_Click);
}
}
..This won't create a 'new' button each time.
(Just a guess)
 
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G

gover

Hey, One other thing, I think You shold create your controls in
CreateChildControls. If you do it on InInit, you controls will probably be
overwritten. This may help(not sure of the syntax):
protected override void CreateChildControls(EventArgs e)
{
base.CreateChildControls(e);
if(!IsPostBack)
{
btn.Text = "this works";
btn.ID = this.UniqueID + "$btn";
btn.Click += new EventHandler(btn_Click);
}
}
 

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