Library code snippets
Adding controls to PlaceHolders dynamically
A very powerful and flexible way to program sites in ASP.NET is to one .aspx which contains a PlaceHolder control for each area of your screen. You then dynamically fill these controls during each hit of your page. This code will get you started. Notice the "FindControl" method with which you identify each control. If you want to use JavaScript on your controls, I think you have to use ClientId to access them, check it out.
<%@ Page Language="C#" %>
<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
//build placeholder
for(int x = 0; x <= 10; x++) {
Label title = new Label();
title.Text = "Item " + x.ToString();
title.ID = "Item" + x.ToString();
Area1.Controls.Add(title);
Area1.Controls.Add(new LiteralControl("<br>"));
}
}
private void ButtonChange_Click(object sender, System.EventArgs e)
{
((Label)(Area1.FindControl("Item" + txtId.Text.ToString()))).Text = txtName.Text.ToString();
}
</script>
<html>
<head>
</head>
<body>
<form id="Form1" method="post" runat="server">
<P>
<asp:PlaceHolder id="Area1" runat="server"></asp:PlaceHolder></P>
<P> </P>
<P>ID:
<asp:TextBox id="txtId" runat="server" Width="51px"></asp:TextBox></P>
<P>New Name:
<asp:TextBox id="txtName" runat="server"></asp:TextBox></P>
<P>
<asp:Button id="ButtonChange" onclick="ButtonChange_Click" runat="server" Text="Change"></asp:Button></P>
<P> </P>
</form>
</body>
</html>
Edward Tanguay updates his personal web site tanguay.info weekly with code, links, quotes and thoughts on web development. Sign up for the free newsletter.
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Hi have your tried loading usercontrols dynamically?
Does the state persist during postbacks? I have noticed that user controls were not loaded during postbacks. We need to load them in every post back
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