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From Daniel Stoch <daniel.st...@gmail.com>
Subject Re: How to handle click on disabled links - ListenerInvocationNotAllowedException?
Date Tue, 17 Jun 2014 14:26:42 GMT
On Tue, Jun 17, 2014 at 4:00 PM, Martin Grigorov <mgrigorov@apache.org> wrote:
> Hi,
>
>
> On Tue, Jun 17, 2014 at 4:55 PM, Daniel Stoch <daniel.stoch@gmail.com>
> wrote:
>
>> Hi,
>>
>> I have a link (or ajax link) which executes some system command. This
>> system gives me an information if this command is enabled or not, so I
>> can mark my link as enabled or disabled (by calling
>> setEnabled(command.isEnabled()) or overriding link.isEnabled()
>> method).
>>
>> 1. Page is being rendered, command is enabled so link is rendered as
>> enabled.
>> 2. In the meantime system state is changed so command became disabled.
>> 3. User clicks link on a page rendered in step 1 where link is
>> rendered as enabled but it is disabled now.
>>
>> In Wicket 1.4 nothing happens in such situation and only warning was
>> logged:
>> "component not enabled or visible; ignoring call. Component:
>> [MarkupContainer [Component id = link]]"
>>
>> In Wicket 6 in such situation the exception is raised:
>> "ListenerInvocationNotAllowedException: Behavior rejected interface
>> invocation."
>>
>> How should I handle this correctly to show some information to user,
>> that this is link is no longer active (but user should stay on the
>> same page)?
>> Should I catch ListenerInvocationNotAllowedException inside
>> IRequestCycleListener.onException()?
>>
>
> Yes. This is the best you can do in this case.
>

Thanks for very fast answer :)
But what should I return as a IRequestHandler in
IRequestCycleListener.onException()? I can return EmptyRequestHandler
to silently catch an exception, but if I want show some info to user
then...?

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