ASP.NET UpdatePanel Error htmlfile: Unknown runtime error, updatePanelElement.innerHTML=rendering

Answer 1

There's a conversation about this error at eggheadcafe.com.

Answer 2

This seems to happen because I've got my UpdatePanel within an ordered list <ol> container. And I've got list item <li> tags within my UpdatePanel's ContentTemplate.

<ol>
    <li>...</li>
    <asp:UpdatePanel ...>
        <ContentTemplate>
            <li id="lione" runat="server">...</li>
            <li id="litwo" runat="server">...</li>
        </ContentTemplate>
        <Triggers>
            ...
        </Triggers>
    </asp:UpdatePanel>
    <li>...</li>
</ol>

It makes sense to me this way, but I guess I'll need to rethink my page layout.

Answer 3

I got the same error but solved.

I am nesting html form inside UpdatePanel. Simply removing the Form tag solved the issue.

Answer 4

Hello All, I need to put client side in a page which contains server but in IE it gives error.

Answer 5

Thanks for the explanation above - I found a solution by wrapping the UpdatePanel with the li that needs to be updated by the event. Hope that helps.

e.g.

<li>
<asp:UpdatePanel runat="server" ID="UpdatePanelCustInfo" UpdateMode="Conditional" RenderMode="Inline">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="ddlCountry" />
    </Triggers>
    <ContentTemplate>
        <label>State:</label>
        <asp:DropDownList ID="ddlStateProvince" AutoPostBack="False" runat="server" CssClass="adminInput">
        </asp:DropDownList>
    </ContentTemplate>
</asp:UpdatePanel>
</li>

Answer 6

I have encountered the same issue. In my case Page (Table) was not designed properly. Here is the issue details in my scenario:

    <table>
<tr>
<td>
    <asp:Label id="Lb1" runat="server"/>
</td>
</tr>
<asp:UpdatePanel id="UP1" runat="server">
<ContentTemplate>
       <!-- controls in Update Panel-->
</ContentTemplate>
</asp:UpdatePanel>
<tr>
<td>
    <asp:Button id="btn" OnClick="btn_Click" runat="server"/>
</td>
</tr>
</table>

I have changed to

<table>
<tr>
<td>
    <asp:Label id="Lb1" runat="server"/>
</td>
</tr>
**<tr>
<td>**
<asp:UpdatePanel id="UP1" runat="server">
<ContentTemplate>
       <!-- controls in Update Panel-->
</ContentTemplate>
</asp:UpdatePanel>
**</td>
</tr>**
<tr>
<td>
    <asp:Button id="btn" OnClick="btn_Click" runat="server"/>
</td>
</tr>
</table>

Issue resolved moving Update panel in to another table row. So I strongly believe proper screen design should address this type of issues.

Answer 7

I totally agree with the solution suneelk.I faced the same problem and rearranged the layout and its gone. Thanks