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

Stuart Douglas (JIRA) jira-events at lists.jboss.org
Fri Feb 27 19:13:54 EST 2009

    [ https://jira.jboss.org/jira/browse/JBSEAM-3507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12454794#action_12454794 ] 

Stuart Douglas commented on JBSEAM-3507:

They should be executed before page actions, otherwise they do not add anything that you cannot already get using from-action. Even though you can already achieve the same effect using dummy page actions I think that questions such as 'How do you prevent a logged on user from seeing the login page' crop up often enough on the forums that it is worth adding an explicit way of accomplishing this. 

Another use case for these is dummy views, which have no actual .xhtml file, just navigation logic, for instance i have used "/parent.xhtml" to refer to the previous view in a conversation, so the 'Done" button always returns you to the correct screen.

> 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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