Client Side Web Development

Re: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

NC01 — Thu, 20 Nov 2008 13:36:53 GMT

I think that it is when the parser happens to try to resolve the <%= %> tags. If controls are being created at that time, you get that error.

NC...

Re: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

vadambaibala — Wed, 19 Nov 2008 21:36:43 GMT

i faced the same issue but i did the same thing it worked i think this post made me clear why ... thanks

Re: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

RobSil — Wed, 19 Nov 2008 21:22:53 GMT

Yes it did. I had already done that as a work-around anyways. THe odd thing is, some of my pages the error shows up on, others it doesn't... in both situations there is javascript methods in the <head> that use <%= myElement.CliendID %> to refer to the object for access it's value. I'm in the middle of another project atm, once I get a chance I'll read up on those links you mentioned to see if I can expand my knowledge in this area.

Thanks,

Rob

Re: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

NC01 — Wed, 19 Nov 2008 18:17:25 GMT

So did moving the JavaScript out of the <head> tags work?

NC...

Re: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

RobSil — Wed, 19 Nov 2008 18:04:39 GMT

Thanks NC.

Re: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

NC01 — Wed, 19 Nov 2008 17:55:10 GMT

Try moving the JavaScript out of the <head> tags to below the </form> tag so that the elements can be created first.

Here are some explanations and other work-arounds if that doesn't help:
http://west-wind.com/WebLog/posts/6148.aspx
http://www.west-wind.com/weblog/posts/5758.aspx

There are many more that I found with a Google search:
http://www.google.com/search?hl=en&q=The+Controls+collection+cannot+be+modified+because+the+control+contains+code+blocks&btnG=Search

NC...

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

RobSil — Wed, 19 Nov 2008 16:11:42 GMT

I keep getting the error message ....

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

I am trying to access the innerhtml of a div on my page in some javascript in my head tag. Problem is, the <head> is runat="server" because I also want to set page title dynamically. My javascript in my head tag is...

//error is thrown.

Can someone elaborate on this error and how to avoid it? It seems like such a common task to do, accessing the CLientID of an elment in order to access it via javascript that i am assuming I am doing somethign blatantly wrong.

Thanks,

Rob