Hello,
I have a very big problem. I won`t put the Controls in Tree View.
When I put the Controls everything is ok control is on the Tree View.
But when I won`t read data from my control my control I disappear from tree view.
This is my simple Code :
ASPX :
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<telerik:RadTreeView ID="RadTreeView1" runat="server">
</telerik:RadTreeView>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
<asp:Button ID="Button2" runat="server" Text="Button" onclick="Button2_Click" />
</div>
<p>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</p>
</form>
</body>
</html>
CS :
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
TextBox txt = new TextBox();
Telerik.Web.UI.RadTreeNode tn = new Telerik.Web.UI.RadTreeNode("1");
txt.ID = "fff";
tn.Controls.Add(txt);
RadTreeView1.Nodes.Add(tn);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = ((TextBox)RadTreeView1.Nodes[0].FindControl("fff")).Text;
}
protected void Button2_Click(object sender, EventArgs e)
{
Label1.Text = ((TextBox)RadTreeView1.Nodes[0].Controls[0]).Text;
}
}
Please Help My. Thank so much
1 Answer, 1 is accepted
Controls added dynamically to a tree node need to be recreated after postback. Otherwise they will disappear as RadTreeView cannot recreate custom controls after postback. The same behavior is present with the built-in Panel and Placeholder controls. Here is how your modified code should look like:
| protected void Page_Load(object sender, EventArgs e) |
| { |
| if (!IsPostBack) |
| { |
| Telerik.Web.UI.RadTreeNode tn = new Telerik.Web.UI.RadTreeNode("1"); |
| RadTreeView1.Nodes.Add(tn); |
| } |
| TextBox txt = new TextBox(); |
| txt.ID = "fff"; |
| RadTreeView1.Nodes[0].Controls.Add(txt); |
| } |
Regards,
Albert
the Telerik team
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