[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-3507) Allow for navigation rules to take effect before the view is displayed

[Dan Allen (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBSEAM-3507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12454788#action_12454788 ] 

Dan Allen commented on JBSEAM-3507:
-----------------------------------

Today you would get this behavior by configuring a page action. Then the navigation rules will be fired after the page action executes based on its signature.

...but the idea of immediate navigation does make sense. Like page actions, these are conditional page navigation. Obviously, the from-action would never apply in this case. Would they be executed before or after page actions? There is some complexity to work out here.

> Allow for navigation rules to take effect before the view is displayed
> ----------------------------------------------------------------------
>
>                 Key: JBSEAM-3507
>                 URL: https://jira.jboss.org/jira/browse/JBSEAM-3507
>             Project: Seam
>          Issue Type: Feature Request
>          Components: Core
>    Affects Versions: 2.1.0.CR1
>            Reporter: Stuart Douglas
>         Attachments: seam-immediate-navigation-v1.diff
>
>
> Allow the developer the specify navigation rules that are evaluated before the view is rendered. 
> For example, say we do not want logged in users to be able to view the login page, we cannot do this:
> <navigation>
>         <rule if="#{identity.loggedIn}">
>             <redirect view-id="/main.xhtml"/>
>         </rule>
> </navigation>
> Instead you must either use a page action that contains the navigation logic, or specify a dummy page action such as ''.toString() 
> and use this action as the from-action in your navigation rules. I propose we add an 'immediate' attribute to the navigation attribute that 
> specifies that this action is evaluated before page actions are run.

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