5 Replies Latest reply on Mar 5, 2010 2:40 PM by nbelaevski

Binding collection of panels

kanikman Mar 5, 2010 4:55 AM

I have in my backing bean this declaration

protected List<HtmlPanel> panels;

Then in bean's constructor I create panels. On the page I have this code:

<a4j:repeat var="panel" value="#{roles.panels}">
                <rich:panel binding="#{panel}">
                    <h:outputText value="#{panel} dupa"/>
                </rich:panel>

</a4j:repeat>

In my backing beans I have method in which I try to hide panel with given id. But it not works. When I declare single panel in backing bean like this:

protected HtmlPanel panel;

and then call method it work, but it did not work on collection of panels. I don't know where is problem?

1. Re: Binding collection of panels

ilya_shaikovsky Mar 5, 2010 5:16 AM (in response to kanikman)

I'm, not sure why you need binding. You could "hide" the panel just by excluding some object from the collection. So during re-render panel for this object will disappears.

Session scoped bindings b.t.w. is not good design for JSF in general - and I guess you using it.
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2. Re: Binding collection of panels

kanikman Mar 5, 2010 5:48 AM (in response to ilya_shaikovsky)

I need binding becouse of need of manipulate objects with calling methods in backing beans. In order to do that I must have object instance. I can't set id dynamically in jsf 1.2 so I can't obtain object instance through id, couse when components are creating at runtime I don't know id generated by JSF.

So, when I can't know id the only way is create dynamically objects and binding them on the page.
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3. Re: Binding collection of panels

ilya_shaikovsky Mar 5, 2010 6:18 AM (in response to kanikman)

actually you could define id's with EL if using facelets.
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4. Re: Binding collection of panels

kanikman Mar 5, 2010 6:21 AM (in response to ilya_shaikovsky)

I use facelets. Can You tell me how can I do taht pleas?
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5. Re: Binding collection of panels

nbelaevski Mar 5, 2010 2:40 PM (in response to kanikman)

Hi Adam,

a4j:repeat doesn't create separate instances of panels, so you will be binding always the same panel, please take a look: http://www.ilikespam.com/blog/c:foreach-vs-ui:repeat-in-facelets

"binding" usage is not a good way to modify components' properties, the better way is to wire necessary attributes to repeat iteration variable properties via EL-expressions.
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