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

[Dan Allen (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBSEAM-2469?page=comments#action_12414828 ] 
            
Dan Allen commented on JBSEAM-2469:
-----------------------------------

Sorry, I misspoke regarding page actions and <render>. If you use the <render> tag, the page action *does* get executed for that view ID. So page actions *always* execute prior to rendering a page, unless disabled by a condition specified in the "if" attribute.

What I am proposing is to recognize a postback and skip the page action if the *same* page is rendered. I don't think we want the onPostback="false" flag to disable the page action if a different page is rendered.

> 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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