[jira] Updated: (WICKET-627) Can't visit components in a ListView before they're rendered.

["Alastair Maw (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alastair Maw updated WICKET-627:
--------------------------------

    Assignee:     (was: Alastair Maw)
     Summary: Can't visit components in a ListView before they're rendered.  (was: onBeforeRenderChildren should be made protected)

I still can't work out how to do this. Igor suggested moving the call to Component#onBeforeRenderChildren() inside Component#onBeforeRender(), but if I do that, I get an NPE in the ListView#renderItem() method even for basic code.

> Can't visit components in a ListView before they're rendered.
> -------------------------------------------------------------
>
>                 Key: WICKET-627
>                 URL: https://issues.apache.org/jira/browse/WICKET-627
>             Project: Wicket
>          Issue Type: Bug
>    Affects Versions: 1.3.0-beta1
>            Reporter: Alastair Maw
>             Fix For: 1.3.0-beta3
>
>
> I've discussed this with Johan and we think we need to make onBeforeRenderChildren() protected.
> <AlMaw> I have a ValidationTaggedForm extends Form.
> <AlMaw> And in onBeforeRender, I call visitChildren(validationTaggingVisitor)
> <AlMaw> And the validationTaggingVisitor adds a behaviour.
> <AlMaw> If I have a ListView in the Form, onBeforeRender for the Form is called before the ListView populateItem calls.
> <AlMaw> Thus the components added in the ListView aren't visited.
> We can't just swap the order of the calls to onBeforeRender() and onBeforeRenderChildren() in Component#beforeRender() because that will break existing code and the repeaters. Besides, someone will only want to do things the other way around at some later date (e.g. attach a behaviour to a parent using a child then needs to reference/find).
> Suggested solution is to make onBeforeRenderChildren() protected, which will allow as much flexibility as you like.

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