How to get the buton id?

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Hi,

Usercontrol have a button with id=hdnBtn as below,

ASP

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Header.ascx.cs" Inherits="M2iSTS2.UserControl.Header" %>

<link href="/Styles/styles.css" rel="stylesheet" type="text/css" />
<script language="javascript" type="text/javascript" src="../Script/Map.js"></script>   

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

     <input type="button" value="Button1" id="hdnBtn" runat="server" onserverclick="assignValue"/>
 <div id="header" class="header">
  	<h1 class="h1">TrackU: Student and Vehicle Tracking System</h1>   
        <p class="p"><a class="a" href="/Account/login.aspx"  önclick='setSession()'>Logout</a></p>
  </div>
  <div>
  	<ul class="ul">
    	<li class="li"><a class="lia" href="/Admin/Fleet.aspx">Fleet</a></li>
        <li class="li"><a class="lia" href="/Admin/StudentInfo.aspx">Student Info</a></li>        
        <li class="li"><a class="lia" href="/Admin/RouteSettings.aspx">Route Settings</a></li>        
        <li class="li"><a class="lia" href="/Admin/Reports.aspx">Reports</a></li>        
    </ul>
  </div>

javscript function as below,

javscript

function setSession() {
    alert(document.getElementById('hdnBtn'));

}

but the

C#

alert(document.getElementById('hdnBtn'));

giving the 'null'.why? how to get the id of button in usercontrol?

Thanks

Posted 18-Dec-12 0:21am

hasbina

Updated 18-Dec-12 0:34am

v2

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pranathis012 · Answer 1 · 2012-12-18T00:27:00

Solution 1

C#

<input id="hdnBtn" type="button" value="Button1" name="hdnBtn1" runat="server" onserverclick="assignValue" />

use this line instead ofthis

C#

<input type="button" value="Button1" name="hdnBtn1" runat="server" onserverclick="assignValue" />

I think this may help you..

Posted 18-Dec-12 0:27am

pranathis012

Comments

hasbina 18-Dec-12 6:35am

sorry, i forgot to change that thing.by providing id, getting null value

Anshu BM · Answer 2 · 2012-12-18T00:28:00

Solution 2

C#

<input type="button" value="Button1" name="hdnBtn1" runat="server" onserverclick="assignValue"/>

Where is the id to this input element

[Code block edited]

Posted 18-Dec-12 0:28am

Anshu BM

Updated 18-Dec-12 22:22pm

v2

Comments

hasbina 18-Dec-12 6:35am

sorry, i forgot to change that thing.by providing id, getting null value