[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-2469) add postback flag to page actions

[Stephen Friedrich (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBSEAM-2469?page=comments#action_12414260 ] 
            
Stephen Friedrich commented on JBSEAM-2469:
-------------------------------------------

Thanks again for the explanation and your patience.

I think it would really be a better solution to utilize Seam's capability of having state surviving a redirect.
After all that is what seam also does for FacesMessages, right?

If this is implemented in the easy way, by making it dependent on the postback/initial request distinction it would be the source of confusion and potential bugs.
You would have to be much more familiar with technical details to see when the option might be useful.
Also I think redirect-after-post is a common idiom, so even if you know about these technical details, you will simply not be able to use the solution.

> add postback flag to page actions
> ---------------------------------
>
>                 Key: JBSEAM-2469
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-2469
>             Project: Seam
>          Issue Type: Feature Request
>          Components: Core
>    Affects Versions: 2.0.1.CR1
>            Reporter: Dan Allen
>         Assigned To: Dan Allen
>             Fix For: 2.1.0.BETA2
>
>   Original Estimate: 1 hour
>  Remaining Estimate: 1 hour
>
> Page actions are incredibly useful, but sometimes they can get in the way during a postback. I would like to see a postback attribute added to the <action> tag that can be used to disable the action on postback. It's possible using a conditional, but it is ugly and a lot of typing.
> Here is the logic that would go into Pages.java
>     private boolean isPostBack(FacesContext facesContext)
>     {
>         return facesContext.getExternalContext().getRequestParameterMap().
>               containsKey(ResponseStateManager.VIEW_STATE_PARAM);
>     }
> The conditional alternative would be:
> <action execute="#{component.action}" if="#{empty param['javax.faces.ViewState']}"/>

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