Refresh user control inside an update panel from javascript

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Hi all,

I am working on a project where I want to refresh a part of the web page where i have a user control that contain dynamic data.user control will load data from a text file as this text file will update frequently. I need to refresh the user control alone not the whole page using javascript. I tried the following but it did not worked for me.

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

<%@ Register src="ucTest.ascx" tagname="ucTest" tagprefix="uc1" %>

<script  runat="server">

   void button_Click(object sender, EventArgs e)
   {
       lbltest.Text = "Refreshed by server side event handler at " + DateTime.Now + ".<br>";
   }

</script>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
   <title>How to update an UpdatePanel with JavaScript</title>
   
   <script type="text/javascript">
   function UpdPanelUpdate()
   {
       __doPostBack("<%= button.ClientID %>","");
   }
   </script>
   
</head>
<body>
   <form id="form1"  runat="server">
      <asp:ScriptManager ID="ScriptManager1" runat="server" />
      <div>
      

   <a href="java<!-- no -->script:UpdPanelUpdate()">Update the Panel</a>
    
    <asp:Button ID="button" runat="server" OnClick="button_Click" style="display:none;"/>
      
         <asp:UpdatePanel runat="server" ID="UpdatePanel1" UpdateMode="Conditional">
            <contenttemplate> 
                <uc1:ucTest ID="ucTest1"  runat="server" />
                <asp:Label ID="lbltest" runat="server">
            </contenttemplate>
            <triggers>
               <asp:AsyncPostBackTrigger ControlID="button" EventName="Click" />
            </triggers>
         
      </div>
   </form>
</body>
</html>
</br>

my user control is.

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="ucTest.ascx.cs" Inherits="ucTest" %>
<table border="3">
    <tr>
        <td>
            <%  Response.WriteFile("TextFile.txt"); %>
        </td>
    </tr>
</table>

Here TextFile.txthas some information that will be changed frequently.

any help would be greatly appreciated.

Posted 1-Aug-11 19:24pm

tanweer

Updated 1-Aug-11 19:58pm

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v2

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[no name] 2-Aug-11 1:59am

format your code when posting a question

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SanjeevSingh · Answer 1 · 2011-08-01T20:01:00

Solution 1

hello Tanweer,

you have taken update panel. now why dont you take an timer and use the tick event for refreshing the data.

thanks
sanjeev

Posted 1-Aug-11 20:01pm

SanjeevSingh

Comments

tanweer 2-Aug-11 2:10am

thank you SanjeevSingh for your reply.
I don't know how to use the timer here I need just to refresh the usercontrol when I click a button from javascript, that is all my requirement.