I *think* you want to handle that inside of onRender:
http://wicket.apache.org/docs/1.4/org/apache/wicket/Component.html#onRender(org.apache.wicket.markup.MarkupStream)
On Thu, Mar 4, 2010 at 7:58 PM, David Chang <david_q_zh...@yahoo.com> wrote:
>
> I am using a div with border color to enclose feedback messages. I can
> control whether to generate the feedback div based on whether there is any
> message to render. Now I hope to change its border color depending on the
> severity of the message. But (1) always causes error:
>
> Cannot modify component hierarchy after render phase has started (page
> version cant change then anymore).
>
> How can I change the border color when there is message to render? What is
> the best way?
>
> Thanks!
>
>
> -----------------
>
> HTML:
>
> <div wicket:id="feedbackHolder" />
>
> Java code:
>
> add(new FeedbackPanel("feedbackHolder") {
> @Override
> public boolean isVisible() {
> (1) if (anyErrorMessage())
> add(new SimpleAttributeModifier("class", "redBox"));
> return anyMessage();
> }
> });
>
>
>
>
>
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