facelets: howto for writing custom components

[arne anka <do...@ginguppin.de>]

hi,
after a lot of trial and error, because none of the howtos i found was  
complete, i finally figured out how to write a custom component.
but now i need to know, how exactly i do force attributes to be set and,  
more important, how i do access components in the body of my component.
ideally these components would be smth like t:commandButton or  
t:graphicImage -- how would i render them?



thanks in advance

Re: facelets: howto for writing custom components

[arne anka <do...@ginguppin.de>]

hi,

>> but now i need to know, how exactly i do force attributes to be set
>
> You could simply output some kind of error message if a required value  
> is not present.

well, i could, of course, but i thougt there was some kind of mechanism i  
only need to hook into ...

>> and, more important, how i do access components in the body of my  
>> component.

> Are you probably asking for <ui:insert/> ?

i don't know. do i?
my particular problem at hand is that as result of some method of my bean  
i get an object.
this object might be of mime type image/jpeg or text/xml.
so i would like to make a component that renders the object depending on  
the mime type -- programatically.
while the xml should be rendered in some kind of datatable the image  
should be rendered in some kind of simple image manipulation gui (zoom,  
gamma) and thus i need to render the action elements (actionButtons  
mostly) with predefined actions.

while i am still want to know how to write my own component at all, for  
this particular task i am open for other  suggestions as well :-)

thanks

Re: facelets: howto for writing custom components

[Oliver Becker <ob...@obqo.de>]

Hi Arne,

> after a lot of trial and error, because none of the howtos i found  
> was complete, i finally figured out how to write a custom component.
> but now i need to know, how exactly i do force attributes to be set

You could simply output some kind of error message if a required value  
is not present.
For example within your component:
<h:outputText rendered="#{requiredAttributeName == null}"  
styleClass="error" value="your error message" />

> and, more important, how i do access components in the body of my  
> component.
> ideally these components would be smth like t:commandButton or  
> t:graphicImage -- how would i render them?

Are you probably asking for <ui:insert/> ?

Cheers,
Oliver

Re: facelets: howto for writing custom components

[Matthias Wessendorf <ma...@apache.org>]

Hello

On Fri, Apr 18, 2008 at 3:00 PM, arne anka <do...@ginguppin.de> wrote:
> hi,
>  after a lot of trial and error, because none of the howtos i found was
> complete, i finally figured out how to write a custom component.
>  but now i need to know, how exactly i do force attributes to be set and,
> more important, how i do access components in the body of my component.
>  ideally these components would be smth like t:commandButton or
> t:graphicImage -- how would i render them?
>
>
>
>  thanks in advance

here is a simple component described:
http://matthiaswessendorf.wordpress.com/2008/02/29/custom-jsf-components-with-facelets/

>



-- 
Matthias Wessendorf

further stuff:
blog: http://matthiaswessendorf.wordpress.com/
sessions: http://www.slideshare.net/mwessendorf
mail: matzew-at-apache-dot-org