But add(HeaderContributor.forCss()) does not modify component tag. It
affects header contribution. Header contribution and component tag
modifications are two different things.
page.add(HeaderContributor.forCss()) works as long as we don't have
that check that throws exception when you add behavior to page.
-Matej
On 6/24/07, Juergen Donnerstag <[EMAIL PROTECTED]> wrote:
> Jan - in the other thread - quite rightly pointed out that
> HeaderContribution does work on pages. It only does not work if a
> component is attached to <html>. What makes <html> different is that
> it must partially be rendered befor the <head> section. Why exactly "a
> component starts rendering before the <head> tag" causes the problem I
> don't know yet.
>
> Juergen
>
> On 6/24/07, Juergen Donnerstag <[EMAIL PROTECTED]> wrote:
> > All behaviors are invoked from Component.onComponentTag(). When a web
> > page renders it does not call onComponentTag() for the page, as the
> > page as no associated markup tag.
> >
> > That means, though you can do add(HeaderContributor.forCss()) (assume
> > you are adding to a page) nothing will happen. The CSS will not be
> > added to the <head> section and you will not get any warning etc..
> > Instead you may use any other component on your page.
> >
> > I agree that throwing an exception is not the preferred solution, but
> > at least it give users a hint that they are doing something that
> > currently doesn't work. I thought this is better than nothing while we
> > could discuss a much better solution for the problem.
> >
> > Using <html>:
> > - means we need to create yet another auto-component (automatically
> > assign a wicket:id; automatically create an associated
> > WebMarkupContainer - which will need some special behavior to be
> > invisible/transparent for users - and of course at runtime you need to
> > execute it. We already had discusions on how to reduce the number of
> > auto components.
> > - do we need to change all relevant WebPage methods to refer to that
> > component? Or only for adding behaviors (e.g.
> > getHtmlComponent().add(behavior). By sometime referring to that that
> > html component and sometimes not, are we not creating yet another
> > inconsistency (or magic).
> >
> > I was thinking of using the <body> component which already is
> > automatically created. BUT it only make sense for HeaderContributors.
> > <html> make more sense for AMs which realy modify an attribute (e.g.
> > lang).
> >
> > >I know onComponentTag doesn't make sense, but that's IMHO not valid
> > >reason to forbid header contribution as well.
> >
> > I agree but would be a suitable technical solution:
> > E.g. keep throwing an exception for IBhavior and implement
> > public void WebPage.add(HeaderContributor contrib)
> > {
> > getBodyContainer().add(contrib)
> > }
> >
> > lets discuss the pros and cons of all alternatives in order to find
> > the best solution for Wicket and all its users.
> >
> > Juergen
> >
> > On 6/24/07, Matej Knopp <[EMAIL PROTECTED]> wrote:
> > > Arrgh. Discard my previous reply. This is wrong. Why shouldn't I be
> > > able to do header contribution on behavior attached to a page? This
> > > doesn't make sense!
> > >
> > > I know onComponentTag doesn't make sense, but that's IMHO not valid
> > > reason to forbid header contribution as well.
> > >
> > > -Matej
> > >
> > >
> > > On 6/24/07, Jonathan Locke <[EMAIL PROTECTED]> wrote:
> > > >
> > > > my code which does this:
> > > >
> > > > add(HeaderContributor.forCss(CSS));
> > > >
> > > > now throws the following exception. my web page needs to contribute
> > > > CSS to
> > > > the header. i'm wondering, why can't i do it this way anymore (it seems
> > > > like WebPage is a component like any other and my code did work fine
> > > > before
> > > > this exception)? and what's the best alternative? thanks!
> > > >
> > > > Caused by: org.apache.wicket.WicketRuntimeException: You can not
> > > > attach behaviors onto WebPages. Web pages do require a markup file but
> > > > no
> > > > specific tag to attach the page to. This is why behaviors such as
> > > > HeaderContributor for example don't work if attached to a WebPage.
> > > > Please
> > > > attach the behavior to any other of your components.
> > > >
> > > >
> > > >
> > > >
> > > > --
> > > > View this message in context:
> > > > http://www.nabble.com/cannot-add-CSS-to-web-page--tf3970619.html#a11270671
> > > > Sent from the Wicket - User mailing list archive at Nabble.com.
> > > >
> > > >
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