troubleshooting Question

webusercontrol - Unable to set value of the property 'value': object is null or undefined

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johnkainn asked on
4 Comments1 Solution765 ViewsLast Modified:
If I have this in web user control (.ascx) I get an error but when it is in aspx page then there is no error. Do you know why that is?
 <telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
        <script type="text/javascript">
            function buildArgument(sender, args) {
                var t = "K";
                document.getElementById("argument").value = t;
          <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
    <asp:HiddenField ID="argument" runat="server" />
    <asp:Button ID="SelectButton" runat="server" Text="Select" Width="100px" OnClick="SelectButton_Click"
                OnClientClick="buildArgument(this, event);" />

Microsoft JScript runtime error: Unable to set value of the property 'value': object is null or undefined
In the debugger this gets highlighted:
document.getElementById("argument").value = t;
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