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Question

asp:HiddenField value set client-side, not received server-side [please delete!]

Answer 1

A:

You're not going to get the value of the hidden field until your page "posts back" to itself or to another page after hitting the form submit button. You could get the value sent to the server async using ajax, but I'm not sure if that's what you're trying to do.

marduk 2009-05-25 20:12:20

Answer 2

A:

Perhaps the value of the server control is being reset on postback? I think you need to remove the "value" attribute in the asp:HiddenField and populate it some other way, perhaps using javascript.

DOK 2009-05-25 20:13:45

I tried removing the asp:HiddenField value= but then Aaargh.Value == "" on postback!

Josh 2009-05-25 20:20:35

Answer 3

+1 A:

Maybe your problem's somewhere else because the following works fine for me:

<%@ Page Language="C#"  %>
<script runat="server">
    protected void BtnOK_Click(object sender, EventArgs e)
    {
        Response.Write(Aaargh.Value);
    }
</script>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
<html xmlns="http://www.w3.org/1999/xhtml"&gt;
<head runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript">
    window.onload = function() {
        document.getElementById("Aaargh").value = "Dynamic Value";
    };
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:HiddenField id="Aaargh" runat="server" value="Initial Value" />
        <asp:LinkButton ID="btnOk" runat="server" OnClick="BtnOK_Click" Text="OK"  />
    </div>
    </form>
</body>
</html>

Darin Dimitrov 2009-05-25 20:14:16

Ok, that's really freaky because your code works for me too? What am I missing!

Josh 2009-05-25 20:24:28

Yes, the problem is somewhere else!

Josh 2009-05-25 21:08:26

Answer 4

A:

In the GetElementById try using the ClientId of the server side control, asp.net adds to the Id to create a unique one.

document.getElementById(<%=Aaargh.ClientId%>).value = "Dynamic Value";
alert(document.getElementById(<%=Aaargh.ClientId%>).value); // Displays "Dynamic Value"

Pharabus 2009-05-25 20:14:40

Answer 5

A:

Onclientclick of your submit button where you create it try this....

submit.onclientclick = "setvalue("Dynamic Value")"

then your javascript function will look like this:

function setvalue(value){
document.getElementById('<%=Aaargh.ClientID%>').value = value;
}

Eric 2009-05-25 20:16:59

Answer 6

A:

It could be a case sensitivity issue in your HiddenField tag. Try:

<asp:HiddenField id="Aaargh" runat="server" Value="Initial Value" />

Jason 2009-05-25 20:26:41

Didn't seem to make any difference, thanks.

Josh 2009-05-25 20:30:54

Try adding onClientClick="alert(document.getElementById('Aaargh').value); return true;" to your submit button in order to see Aaargh's value just before the postback.

Jason 2009-05-25 20:47:01

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asp:HiddenField value set client-side, not received server-side [please delete!]

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