[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-691) Ability to turn off page parameter appending for s:link

[Christian Bauer (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBSEAM-691?page=comments#action_12351622 ] 
            
Christian Bauer commented on JBSEAM-691:
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Or simply do not append the page parameter if the value binding resolves to 'null'. I don't think ?param=null is useful anyway, so I might as well null out the value before Render Response in some cases.


> Ability to turn off page parameter appending for s:link
> -------------------------------------------------------
>
>                 Key: JBSEAM-691
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-691
>             Project: JBoss Seam
>          Issue Type: Feature Request
>          Components: JSF
>            Reporter: Christian Bauer
>            Priority: Minor
>
> You have basically two choices how you can transport state in a RESTful way between pages:
> A. Use <s:link>, append the parameters manually, and pull the state on the target pages' backing bean with @RequestParameter
> B. Use <s:link>, and let Seam automatically append the parameters that the target page requires (pages.xml parameters), set the values on the backing bean that way
> Option A seems to be a good overall strategy if you rarely have to pass parameters around. Option B is the "always pass parameters around" option.
> In practice, you need a mixed strategy frequently. You might go for option B because it is so convenient, but disabling the parameters when _not_ needed (because the target page treats them conditionally, for example) requires customized <s:link> declarations, like:
> <s:link action="foo"><f:param name="aParamIDoNotWantToPropagate" value=""/></s:link>
> Effectively, page parameters currently guarantee that every link to that page contains the specified parameters. I want to sometimes disable this guarantee, e.g. with <s:link parameters="none"/>

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