why do my Control IDs suddenly reference "_ctl0" in ASP.NET?

Posted on 2009-07-04
Medium Priority
Last Modified: 2013-11-18
Hello All,

I have a web application in ASP.NET that uses a master page as a template.

Everything works fine in our development environment, but when we deploy the application to the production environment all of the control IDs change:

For example, this on development:
<input name="ctl00$cphMainContent$txtSomeTextbox" type="text" id="ctl00_cphMainContent_txtSomeTextbox" />

Becomes this on release:
<input name="_ctl0:cphMainContent:txtSomeTextbox" type="text" id="_ctl0_cphMainContent_txtSomeTextbox" />

The application uses javascript on numerous pages to access elements via the 'getDocumentById' function, so having the IDs changes in the source like this is buggering things up quite a bit.  The server is configured the same for .NET for both environments.

Has anyone else also seen this behavior?  What is cause and how do I go about fixing it so that the IDs do not change in the source?

Many thanks,

Question by:SGIC2008

Expert Comment

ID: 24778318
ASP.NET Web Controls have this known "translation" of ControlID's between WYSIWYG and deployed states.  It is an intentional and well documented behavior.

HTML Web Controls, however, do not change their ControlID's between edit and published views.
LVL 10

Expert Comment

ID: 24779026
This is "standard" behavior of ASP.Net...
You can use txtSome.ClienID to get the "Server Control ID at RunTime" and you can then pass that info to your JavaScript...
Here's an example of how I use it:
KeywordTB.Attributes.Add("onKeyPress", "doClick('" + KwdSrchBtn.ClientID + "')")

Accepted Solution

nikege earned 2000 total points
ID: 24780739
Check web.confing on both servers.It seems one of them contains

<xhtmlConformance mode="Legacy"/>

Look at this article http://weblogs.asp.net/scottgu/archive/2006/12/10/gotcha-don-t-use-xhtmlconformance-mode-legacy-with-asp-net-ajax.aspx.
 here is the result of using and not using Legacy

With legacy, this is the emitted html:

           <input id="_ctl0__ctl0_eDefaultStore_0" type="radio" name="_ctl0:_ctl0:eDefaultStore" value="1" />

Without legacy:

           <input id="ctl00_ctl00_eDefaultStore_0" type="radio" name="ctl00$ctl00$eDefaultStore" value="1" />

Author Closing Comment

ID: 31599829
Thanks this was exactly what the problem was.  The root web.config had this set to legacy and this was inherited by our application that was in a sub folder.

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