Updating UpdatePanel from User Control

Question

_{Tuesday, May 15, 2007 4:16 PM}

Im havin problem s trying to update an UpdatePanel outside a User Control. This UP is suposed to update when i click a control in the UC.

I tried to add a trigger programmaticaly from when the UC loads.
Also tried the RegisterAsyncPostbackControl from the UC (this.Page.Master.FindControl("ScriptManager1").RegisterAsyncPo...)

none of this is working and i dont know hot to access the UC from the master page.
The user control is not contained in the master, is contained in an aspx using a master page.

The UpdatePanel is contained within the master page

Thanks

All replies (12)

_{Friday, May 18, 2007 5:08 AM ✅Answered}

Maybe it's supported/works, just not for any control on the page. /"The control that the AsyncPostBackTrigger references must be in the same naming container as the update panel for which it is a trigger. Triggers that are based on controls in other naming containers are not supported...", and other restrictions applies./

I think it's safer to tell in the doc, that use RegisterAsyncPostBackControl(Control) and the update method, because it works for any postback control on the page.

Thanks for the clarification.

_{Sunday, May 20, 2007 10:04 PM ✅Answered}

Here is a sample made according to your situation, please try it:

[Master]

<%@ Master Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = DateTime.Now.ToString();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
            </ContentTemplate>
        </asp:UpdatePanel>

        <asp:contentplaceholder id="ContentPlaceHolder1" runat="server">
        </asp:contentplaceholder>
    </div>
    </form>
</body>
</html>

[Page]

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" Title="Untitled Page" %>

<%@ Register Src="WebUserControl.ascx" TagName="WebUserControl" TagPrefix="uc1" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <uc1:WebUserControl ID="WebUserControl1" runat="server" />
</asp:Content>

[UserControl]

<%@ Control Language="C#" ClassName="WebUserControl" %>

<script runat="server">

    protected void Button1_Click(object sender, EventArgs e)
    {
        UpdatePanel up = this.Page.Master.FindControl("UpdatePanel1") as UpdatePanel;
        up.Update();
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        ScriptManager sm = ScriptManager.GetCurrent(this.Page);
        sm.RegisterAsyncPostBackControl(Button1);

        UpdatePanel up = this.Page.Master.FindControl("UpdatePanel1") as UpdatePanel;
        up.UpdateMode = UpdatePanelUpdateMode.Conditional;
    }
</script>

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />

_{Wednesday, May 16, 2007 8:24 PM}

Show us some HTML and code behind would be helpful.

_{Friday, May 18, 2007 3:58 AM}

Hi,

You can use ScriptManager.GetCurrent(this) method in the content page to get reference to the ScriptManager instance. Try this:

ScriptManager.GetCurrent(this).RegisterAsyncPostBackControl(ucInstance);

Please note that UP doesn't support add trigger programatically.

Hope this helps.

_{Friday, May 18, 2007 4:22 AM}

Please note that UP doesn't support add trigger programatically.

Are you sure? The updatepanel trigger collection has an add method. I can add a trigger programatically to the updatepanel with that method, just tested.

AsyncPostBackTrigger t = new AsyncPostBackTrigger( );
t.ControlID = yourTriggerItem.ClientID;

yourUpdatePanel.Triggers.Add( t );

_{Friday, May 18, 2007 4:30 AM}

Please note that UP doesn't support add trigger programatically.

Are you sure? The updatepanel trigger collection has an add method. I can add a trigger programatically to the updatepanel with that method, just tested.

AsyncPostBackTrigger t = new AsyncPostBackTrigger( );
t.ControlID = yourTriggerItem.ClientID;

yourUpdatePanel.Triggers.Add( t );

http://ajax.asp.net/docs/mref/T_System_Web_UI_AsyncPostBackTrigger.aspx

Programmatically adding AsyncPostBackTrigger controls is not supported. Use the RegisterAsyncPostBackControl(Control) method of the ScriptManager control to programmatically register a postback control, and then call the Update() method of the UpdatePanel when the control posts back.

I haven't got the exact reason yet, but it's not recommended to do so. It may work, but can't guarantee anything.

_{Friday, May 18, 2007 11:51 AM}

Thanks for your reply. This seem helpful.

I was wondering why im not getting the initialization script when the page is rendered to the browser:

Sys.WebForms.PageRequestManager._initialize('ctl00$Manager', document.getElementById('aspnetForm')); I took this from another application where partial rendering works just fine.

Im not getting this lines at the begining of the document.
Meybe this is the main issue. How can I get this lines to generated. I have compared both apps and the web.config has the same structure.

Thanks for your help

_{Friday, May 18, 2007 12:13 PM}

Raymond,

After using your code example those lines that were missing appeared in the rendered paged.

But still the page is doing a normal postback.

_{Friday, March 28, 2008 11:53 AM}

Hello,

My case is exactly similar to this one , but i have my button control in gridview so i cannot directly add the ID of that button,

So i wrote this functionality in gridview databound event

Button addNewUploadButton = (Button)(((TextBox)sender).Parent.Parent).FindControl("addNewUploadButton");

{

ScriptManager sm = ScriptManager.GetCurrent(this.Page);
sm.RegisterAsyncPostBackControl(Button1);

UpdatePanel up = this.Page.Master.FindControl("UpdatePanel1") as UpdatePanel;
up.UpdateMode = UpdatePanelUpdateMode.Conditional;
}

and the rest is same but i am getting invalid operation exception saying that Update method can only be called on UpdatePanel with ID 'UpdatePanel1' when updatepanel.updatemode is conditional .

Could you please help me out where i am going wrong.

_{Wednesday, May 28, 2008 1:52 AM}

I found this problem also, Please suggest me. I use vb language.

_{Wednesday, May 28, 2008 8:29 AM}

If your problem is same as mine, then it is working for me with this code... try it

IN PAGE LOAD :

Button addNewUploadButton = (Button)row.FindControl("addNewUploadButton");

ScriptManager sm = ScriptManager.GetCurrent(Parent.Page);

sm.RegisterPostBackControl(addNewUploadButton);

//sm.RegisterPostBackControl(lineItemGrid);

But for the first page load only this block of code will work for file upload but for postbacks i put this code twice(like below) and it is working for me.

if (Session["WorkOrderID"] != null) //this will excute for thepage postback but not for the page load.

{

bindLineItemGrid();

Button addNewUploadButton = (Button)row.FindControl("addNewUploadButton");

ScriptManager sm = ScriptManager.GetCurrent(Parent.Page);

sm.RegisterPostBackControl(addNewUploadButton);

//sm.RegisterPostBackControl(lineItemGrid);

}

_{Wednesday, February 3, 2010 6:03 AM}

You can user Delegate ...

Create delegate in your user control as

public delegate void GetScanedDocuments(long visitId);

GetScanedDocuments dGetScanedDocuments;

public GetScanedDocuments FnGetScanedDocuments
{

set
{

            dGetScanedDocuments = value;
        }
        get { return dGetScanedDocuments; }

}

On your page define function which will call update() funciton of update panel and fill

public void GetScanedDocuments(long visitId)
    {
        DisplayScanedDocuments(visitId);
        upPatientDocuments.Update();
    }

Now on your page's load event assign function which will load data in update panel like

ctrlPatientWHR.FnGetScanedDocuments = this.GetScanedDocuments;

In side control execute funciton

dGetScanedDocuments(64);

Last updated on 2007-05-15

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Updating UpdatePanel from User Control

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