CODEWITHSUNDEEP
jsf-2
Richard
Richard

Reputation: 1739

preRenderView method executed before I get to the page

I've got this in a page I use to edit 'events'

<f:metadata>
    <f:viewParam id="event_id" name="eventId" value="#{eventController.eventId}"/>
    <f:event type="preRenderView" listener="#{eventController.loadEvent}" />
</f:metadata>

...and a corresponding loadEvent method in my "ViewScoped" bean.

In a 'list events' page where the user can select which event they want to edit, I build up links like this

<h:link value="Full details" outcome="/calendar/viewEvent" includeViewParams="true">
    <f:param name="eventId" value="#{calendarController.event.eventId}" />
</h:link>

I wouldn't expect the loadEvent method to be called until I click on a link, but it gets called once, and once only, when I visit the 'list events' page.

Sure this is down to the JSF-lifecycle somehow... but why?

Upvotes: 0

Views: 658

Answers (1)

Knut Vidar Siem
Knut Vidar Siem

Reputation: 96

I'm also experiencing this with Mojarra 2.1.10 (I'm assuming you're also on Mojarra?). The bug has already been submitted as JAVASERVERFACES-2158 with no fix or workaround at the time of writing. The problem is this: During preemptive navigation done when rendering UIOutcomeTarget components such as h:link and h:button with view parameters included, the target view is compiled to extract f:viewParam/UIViewParameter components from its h:metadata element. This compilation has a side-effect of also setting up event subscriptions on the current UIViewRoot based on the f:event elements . In the normal case – that is when the view returned to the user in the response is being compiled – this is all fine. However, when another view is compiled for the sake of obtaining its view parameters, registering event subscriptions on the current view root (as in FacesContext.getViewRoot()) is not fine at all.

Upvotes: 3

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