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Editorial Team
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Asked: 2026-05-26T20:39:18+00:00

In my application i just want to alert the value in the text box

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In my application i just want to alert the value in the text box using javascript .

aspx page code

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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 runat="server">
    <title></title>

    <script type="text/javascript">
        alert("hi");
        alert(document.getElementById('<%=textbox1.ClientID%>').value);
 </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:TextBox  runat="server" ID="textbox1"  Text="asdsad">
            </asp:TextBox>
    </div>
    </form>
</body>
</html>

I only get alert ‘hi’ ..after that i get an error ” object required” . whats the reason?

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1 Answer

  1. Editorial Team

    Your code is running before the element has been displayed on the screen. Try – 

    window.onload = function() {
     alert("hi");
     alert(document.getElementById('<%=textbox1.ClientID%>').value);
}

    Or move your script to the bottom of the page as suggested by Tejs in the comments below.

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