Trigger Event in behind code when click on Dynamically added button

Question

I am trying to call btn_Click from the dynamically added button using HtmlTextWriter. But it will not trigger. I am unable to add event handler in code behind to the button as it is not a ASP.NET button.

    protected void btn_Click(object sender, EventArgs e)
    {
         WindowJavaScript.Alert("halo");
    }

protected void PageLoad(object sender, EventArgs e)
{
    //some checking hee to determine whether user is admin or not.
    if(isAdmin)
    {
         writer.AddAttribute(HtmlTextWriterAttribute.Class, "nav navbar-nav navbar-right");
         writer.RenderBeginTag(HtmlTextWriterTag.Ul);
         writer.RenderBeginTag(HtmlTextWriterTag.Li);

         writer.AddAttribute(HtmlTextWriterAttribute.Class, "navbar-brand");
         writer.AddAttribute("runat", "server");
         writer.AddAttribute(HtmlTextWriterAttribute.Id, "admin_B");
         writer.AddAttribute("onserverclick", "btn_Click");
         writer.RenderBeginTag(HtmlTextWriterTag.Button);

         writer.Write("Admin");
         writer.RenderEndTag();
         writer.RenderEndTag();
         writer.RenderEndTag();
    }
}

Can you add this lines of code in on init event? protected void Page_Init(object sender, EventArgs e) { } Also, you are constrainted to use HtmlTextWritter? — adricadar
– adricadar, Commented Mar 12, 2015 at 12:19
It doesn't work in Page_Init. Any recommended method instead of HtmlTextWriter? — superhuman1314
– superhuman1314, Commented Mar 12, 2015 at 12:30
I posted an answer with an recommended alternative, please also read the first paragraph. — adricadar
– adricadar, Commented Mar 12, 2015 at 13:14

adricadar · Accepted Answer · 2015-03-12 13:19:23Z

1

Trying to translate your code to map attributes to a button i noticed that you have writer.AddAttribute("onserverclick", "btn_Click") and you should have writer.AddAttribute("onclick", "btn_Click").

Also you can add a button dynamically in your page by appending it to another control from the page.

protected void PageLoad(object sender, EventArgs e)
{
        //some checking hee to determine whether user is admin or not.
        if (isAdmin)
        {
            var btnAdmin = new Button();
            btnAdmin.Click += btn_Click;
            btnAdmin.Text = "Admin";
            btnAdmin.ID = "admin_B";

            otherControl.Controls.Add(btnAdmin); // you need to create otherControl on page
        }
}

edited Mar 12, 2015 at 13:19

answered Mar 12, 2015 at 12:45

adricadar

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