Vista - Update Panel not updating DOM

I have an asp.net page that contains an update panel. Within the update
panel, controls get added dynamically. During partial page post backs the
controls within the panel will change.

I have a javascript function that uses the ClientID of the dynamic controls
to perform certain operations on the client-side. With each partial page post
back, I dynamically recreate the javascript function using the ClientIDs of
the newly added controls. I use ScriptManager.RegisterStartupScript to add
the newly created script to the page.

Using debug, I stepped through and I can see that the controls and
javascript are all getting created correctly.

The javascript function runs correctly on the initial page load. But, on a
partial page postback, it is throwing a null exception in the client
javascript because it is searching for a ClientID that does not exist.

The DOM does not get updated with the new ClientIDs.

How can I force the DOM to update on a partial page postback?

Hi,

I cannot reproduce this problem. My test code:

Aspx:
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Panel ID="Panel1" runat="server">
<asp:Button ID="Button1" runat="server" Text="Change
Control"
onclick="Button1_Click" />
<asp:Label ID="Label1" runat="server"
Text="Label"></asp:Label>
</asp:Panel>

</ContentTemplate>
</asp:UpdatePanel>

Aspx.cs:
protected void Page_PreRender(object sender, EventArgs e)
{

if (!IsPostBack)
{
ScriptManager.RegisterStartupScript(this.UpdatePanel1,
typeof(UpdatePanel), "allen"," <script type='text/javascript'>
alert(document.getElementById('" +
this.Label1.ClientID + "').tagName)</script>", false);

}
}


protected void Button1_Click(object sender, EventArgs e)
{
TextBox t=new TextBox();
this.Panel1.Controls.Clear();
this.Panel1.Controls.Add(t);
t.ID = "TextBox1";
ScriptManager.RegisterStartupScript(this.UpdatePanel1,
typeof(UpdatePanel), "allen"," <script type='text/javascript'>
alert(document.getElementById('" + t.ClientID + "').tagName)</script>",
false);

}

In the first page load you can see the message box showing "SPAN". If you
click the button you'll see "INPUT".
Could you test my code? Look forward to your test result.

Regards,
Allen Chen
Microsoft Online Support

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| Subject: Update Panel not updating DOM
| Date: Fri, 10 Oct 2008 02:03:01 -0700
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|
| I have an asp.net page that contains an update panel. Within the update
| panel, controls get added dynamically. During partial page post backs the
| controls within the panel will change.
|
| I have a javascript function that uses the ClientID of the dynamic
controls
| to perform certain operations on the client-side. With each partial page
post
| back, I dynamically recreate the javascript function using the ClientIDs
of
| the newly added controls. I use ScriptManager.RegisterStartupScript to
add
| the newly created script to the page.
|
| Using debug, I stepped through and I can see that the controls and
| javascript are all getting created correctly.
|
| The javascript function runs correctly on the initial page load. But, on
a
| partial page postback, it is throwing a null exception in the client
| javascript because it is searching for a ClientID that does not exist.
|
| The DOM does not get updated with the new ClientIDs.
|
| How can I force the DOM to update on a partial page postback?
|

Thank you for your help. In the process of trying to replicate the bug for
you, I figured out the problem. I have the controls in separate UpdatePanels.
The UpdateMode was set to Conditional. So when the ClientIDs would change,
they never get pushed to the client.


"Allen Chen [MSFT]" wrote: