add(new Link<User>("editgroup", user) {
onclick() {
...
}
isvisible() {
return user.getgroup()!=null;
}
}
?
-igor
2009/7/30 Iain Reddick <[email protected]>:
> Hi all,
>
> One of the difficulties I am finding with wicket is the best practice when
> displaying/using data that is potentially null.
>
> Example:
>
> I have a "user" object which has a nullable "group" property. I want to show
> a link to the group details page when the "group" property is not null, but
> show nothing otherwise (let's keep this simple).
>
> My issue is that either way, I have to construct the link component and add
> it to the page, whether I want it is visible or not. This is tricky at the
> best of times, as I must always carry out a lot of "is null" logic.
>
> The construction issue becomes multiplied if I want the same behaviour on a
> stateful page (i.e. the link, etc. can be appropriate for linking to the
> group, or be null and not visible and can switch between the two states).
>
> My question is - am I missing something, or do I just need to have a better
> strategy for this type of situation?
>
> If the answer is the latter, does anyone have any tips and/or components
> that would cut down on the extra coding?
>
> Thanks
>
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