This is because behaviours aren't components and thus cannot
contribute to the header/ body onload. But you generally (probably
always) want them to contribute. Not so much for the reply, but for
putting the ajax libs etc in the page in the first place.
If you see a more elegant way to acchieve the same, please feel free to adjust.
Eelco
On 1/20/06, Juergen Donnerstag <[EMAIL PROTECTED]> wrote:
> Ahh, AjaxHandler is implementing it. But the question remains.
> AjaxHandler is a IBehaviour and not the AjaxHandler IMO should make
> the contribution to the header but the component the AjaxHandler is
> attached to. I'm not a ajax expert but I thought that ajax responds
> just with parts of an HTML page which needs to be re-rendered but the
> header stays the same. And even if an ajax response is not HTML it is
> some XML schema which the js reader is able to interpret and to make
> the DOM changes.
>
> BTW because AjaxHandler implements the interface it basically
> duplicates the code which already is implemented for containers to
> make sure a header is contributed just once.
>
> Juergen
>
> On 1/20/06, Juergen Donnerstag <[EMAIL PROTECTED]> wrote:
> > The code snippet below is execute for each almost every component
> > while rendering the <head> section of a page. I wonder this is for.
> > And the use case is. What is that any component might contribute to
> > <head> or <body onLoad>? Originally the intend was that Panel and
> > Border implements the IHeaderContributor interface because here is
> > makes senses. <wicket:head> and body tag may contribute to the pages
> > header in case the panel requires any javascript, css or onLoad
> > initialization.
> >
> > Any ideas? Otherwise I'll remove it.
> >
> > Juergen
> >
> > // get head and body contributions in one loop
> > // NOTE: THIS CODE MUST BE IN SYNC WITH SAME PIECE OF CODE
> > in
> > WEBMARKUPCONTAINER
> > List behaviors = getBehaviors();
> > for (Iterator i = behaviors.iterator(); i.hasNext();)
> > {
> > IBehavior behavior = (IBehavior)i.next();
> > if (behavior instanceof IHeaderContributor)
> > {
> >
> > ((IHeaderContributor)behavior).renderHead(container);
> > }
> >
> > if (behavior instanceof IBodyOnLoadContributor)
> > {
> > String stmt =
> > ((IBodyOnLoadContributor)behavior).getBodyOnLoad();
> > if (stmt != null)
> > {
> >
> > ((WebPage)getPage()).appendToBodyOnLoad(stmt);
> > }
> > }
> > }
> >
>
>
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