I have a child page using partial page rendering and the web controls are created programmatically. Ajax seems to have a problem with control ID naming when you create your web controls dynamically. When I run this it gives me an object instance error indicating the named control "Lable1" doesn't exist.
Has anyone else run into this problem?
Is there a work around?
Master Page
<%@dotnet.itags.org.MasterLanguage="C#"AutoEventWireup="true"CodeFile="MasterPage.master.cs"Inherits="MasterPage" %>
<!DOCTYPEhtmlPUBLIC"-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml">
<headrunat="server">
<title>Untitled Page</title>
</head>
<body>
<formid="form1"runat="server">
<div>
<asp:contentplaceholderid="ContentPlaceHolder1"runat="server">
</asp:contentplaceholder>
</div>
</form>
</body>
</html>
CS child page
<%@dotnet.itags.org.PageLanguage="C#"MasterPageFile="~/MasterPage.master"Title="Untitled Page" %>
<asp:ContentID="Content1"ContentPlaceHolderID="ContentPlaceHolder1"Runat="Server">
<scriptrunat="server">
protectedvoid Page_Load(object sender,EventArgs e)
{
UpdatePanel up1 =newUpdatePanel();
up1.ID ="UpdatePanel1";
up1.UpdateMode =UpdatePanelUpdateMode.Conditional;
Button button1 =newButton();
button1.ID ="Button1";
button1.Text ="Submit";
button1.Click +=newEventHandler(Button_Click);
Label label1 =newLabel();
label1.ID ="Label1";label1.Text ="A full page postback occurred.";
up1.ContentTemplateContainer.Controls.Add(button1);
up1.ContentTemplateContainer.Controls.Add(label1);
Page.Form.Controls.Add(up1);
}
protectedvoid Button_Click(object sender,EventArgs e)
{
((Label)Page.FindControl("Label1")).Text ="Panel refreshed at " +DateTime.Now.ToString();
}
</script>
<div>
<asp:ScriptManagerID="ScriptManager1"runat="server">
</asp:ScriptManager>
</div>
</asp:Content>
Create your controls in the Page_Init vs the Page_Load method.
-Damien
Damien -
I tried creating the controls in the Page_Init and it still will not work. The referrence to the control is still null. Is the page lifecycle timing wrong with the Button_Click event?
Try refering your control with:
YourUpdatePanel.ContentTemplateContainer.FindControl("YourControlName")
I don't have access to the UpdatePanel at design time.
UpdatePanel.ContentTemplateContainer.FindControl("controlName")
Thank you. Seems to work referencing the UpdatePanel "up1". Although you must instantiate "up1" as global. Simple but necessary.
