Client-Side Changes to Hidden Field Not Persisted

I've got a bit of Javascript that updates the value of a HiddenField at some point on the client side. I've verified that the script does in fact update the field. The problem comes during postback, instead of the new value being persisted to the viewstate, its value is lost early on in the postback.

 Any ideas?

7/19/2007 10:13:36 PM 93655 articles. 6 followers. Follow

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To persist the changes to the server, the hidden field needs to have runat="server" property.  Here is a very simple example to demonstrate it works fine.


<asp:HiddenField ID="hdnField1" runat="server" />
<input type="button" value="Change Value" onclick="ChangeValue();" id="CheckValue" />
<asp:Button ID="Submit" runat="server" Text="Check Changed Value" />
<script type="text/javascript">
function ChangeValue()
document.getElementById("hdnField1").value = "500";

 In the code: (in VB.NET)

If Not IsPostBack Then
            hdnField1.Value = "100"
        End If
        message.Text = hdnField1.Value
7/19/2007 11:29:02 PM

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