Problems creating head section - Unrecognized tag prefix or device filter 'asp'

Luurs

Hi All,

I've been using a asp-label in the HTML <headsection for quite some
time in order to dynamically generate meta-keywords,-description, css
and js references.
Though the actual HTML-output isn't that pretty (<span>'s in the
head-section...) it works fine with browsers, crawlers. It never REALLY

was an issue...
However, in VS2005 this method is considered to be an error
"Unrecogniz ed tag prefix or device filter 'asp'". I do understand it's
because the label is not placed within the <FORM>, etc, etc...
Still, Is there a good reason why "suddenly" the method is thought to
be an "Error"?
Will it have any consequences, now or in the near future if I just
ignore the error-warning and continue using the method?
If NOT, can I filter out this specific error from the error-list
(Without loosing the "Unrecogniz ed tag prefix or device filter
'asp'"-error for other occasions)?
If YES, is there a good alternative available?
The MSDN solution
http://msdn.microsoft.com/library/en...9a042924-3a16-...

is just another way of creating the same problem.
I did quite some searching/trying out myself, but all option had their
disadvantages so far...
The desired solution would be something like this:
<head id="PageHead" runta="server"i n the .aspx file, and in the
codebehind something like:
HtmlGenericCont rol pageHead =
(HtmlGenericCon trol)this.Page. FindControl("Pa geHead");
pageTitle.Inner Text = "page-title, Meta/etc-stuff in here";
This works great, and it also removes the annoying
<meta content="Micros oft Visual Studio 7.0" name="GENERATOR ">
<meta content="JavaSc ript" name="vs_defaul tClientScript">
<meta content="http://schemas.microso ft.com/intellisense/ie5"
name="vs_target Schema">
from the head section!
However, somehow a second (empty) <title></titleis inserted just
before </head>!
It, needs no explanation that this is unwanted behavior...
Is it a ASP.Net issue or a CMS-feature?
Does anyone know why, how and when this is happening?
I really want to move our VS 2005 solution to runtime, but feel
uncertain about the current situation (as described on top of this
post).
I'm using VS 2005 prof. edition on a Windows Server 2003...
Any help would be much appreciated!
Luurs

Aug 3 '06 #1

Subscribe Reply

3877

Alan Silver

In article <11************ *********@s13g2 000cwa.googlegr oups.com>, Luurs
<je************ *@akzonobel.com writes

>Hi All,

I've been using a asp-label in the HTML <headsection for quite some
time in order to dynamically generate meta-keywords,-description, css
and js references.
Though the actual HTML-output isn't that pretty (<span>'s in the
head-section...) it works fine with browsers, crawlers. It never REALLY
was an issue...

Literal controls are more useful for this sort of thing as they do not
add anything. Whatever you set the Text property to, that's what will be
output. No <span>, no nothing ;-)

>However, in VS2005 this method is considered to be an error
"Unrecognize d tag prefix or device filter 'asp'".

Well known bug in VS2005. Usually cured by either deleting the schema
files, or just keeping the master page open in the IDE.

Either way, you can safely ignore the error as long as your pages
compile OK.

I do understand it's
because the label is not placed within the <FORM>, etc, etc...

That's not the reason. Not all server controls have to be inside a form.

>Still, Is there a good reason why "suddenly" the method is thought to
be an "Error"?

Bug

>Will it have any consequences, now or in the near future if I just
ignore the error-warning and continue using the method?

>If NOT, can I filter out this specific error from the error-list
(Without loosing the "Unrecogniz ed tag prefix or device filter
'asp'"-error for other occasions)?
If YES, is there a good alternative available?
The MSDN solution
http://msdn.microsoft.com/library/en...9a042924-3a16-...

Don't know what that is as the link you provided was incomplete,
however, the two suggestions above usually fix it.

>is just another way of creating the same problem.
I did quite some searching/trying out myself, but all option had their
disadvantage s so far...
The desired solution would be something like this:
<head id="PageHead" runta="server"i n the .aspx file, and in the
codebehind something like:
HtmlGenericCon trol pageHead =
(HtmlGenericCo ntrol)this.Page .FindControl("P ageHead");
pageTitle.Inne rText = "page-title, Meta/etc-stuff in here";

Painful way to do this. The page title can be set using...

Page.Title = "My page";

if you want to do it dynamically, or simply using the Title attribute of
the @Page directive if it's static.

Meta tags, CSS, Javascript, etc can all be added to the header simply by
adding a contentplacehol der inside the <headtag and putting your meta
tags, etc inside the content control on the .aspx page. It's much
simpler than the messy way MS implemented it.

>This works great, and it also removes the annoying
<meta content="Micros oft Visual Studio 7.0" name="GENERATOR ">
<meta content="JavaSc ript" name="vs_defaul tClientScript">
<meta content="http://schemas.microso ft.com/intellisense/ie5"
name="vs_targe tSchema">
from the head section!

Do it the way I suggested and you won't get these either. You'll only
get exactly what you want in there.

>However, somehow a second (empty) <title></titleis inserted just
before </head>!

You don't need to add a <titletag, just set Page.Title and the
framework will add the tag for you. I suspect you are adding your own
tag and the framework is adding its own, resulting in two.

>It, needs no explanation that this is unwanted behavior...
Is it a ASP.Net issue or a CMS-feature?
Does anyone know why, how and when this is happening?

No, but try it the way I suggested and see if it still happens. If yes,
then it's not an ASP.NET issue as I do this all the time and it works
fine.

>I really want to move our VS 2005 solution to runtime, but feel
uncertain about the current situation (as described on top of this
post).

I'm using VS 2005 prof. edition on a Windows Server 2003...

Me too. HTH

--
Alan Silver
(anything added below this line is nothing to do with me)

Aug 8 '06 #2

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