Alright, this is my last try replying with MS Outlook. =) And I will also add
more info to help with this thread.
You can use borders to acomplish what you want. Here's an example:
#JAVA
public abstract class ConditionalHiddenBorder extends Border {
public ConditionalHiddenBorder(String id) {
super(id);
}
public abstract boolean isVisible();
}
#HTML
<html>
<body>
<wicket:border>
<wicket:body/>
</wicket:border>
</body>
</html>
#EXAMPLE (Wicket's Quickstart)
public HomePage() {
final Label label = new Label("message", "If you see this message wicket
is properly configured and running");
ConditionalHiddenBorder chb = new ConditionalHiddenBorder("border") {
public boolean isVisible() {
return label.getDefaultModelObject() != null;
}
};
chb.add(label);
add(chb);
}
#HTML Example
<div wicket:id="border">
<span wicket:id="message">message will be here</span>
</div>
Hope this reply works!
cheers,
Bruno
-----Original Message-----
From: kan [mailto:[EMAIL PROTECTED]
Sent: Monday, December 01, 2008 9:03 AM
To: users@wicket.apache.org
Subject: make invisible if model object is null
I use the next construction very often:
[markup]
<wicket:enclosure child="something">
<p>Something here, description, comments etc: <span
wicket:id="somethinig"></span></p>
</wicket:enclosure>
[java]
add(new Label("something")
{
@Override
public boolean isVisible() {
return super.isVisible() && getDefaultModelObject() != null;
}
});
And there are a lot different components which should be hidden with
some arounding text if they have null value of model object.
How to make this more elegant?
First obvious way - inherit from Label, and make something
LabelInvisibleNull, but it is very bad, because a lot different
components (not only Label, but Image, WebMarkupContainer, some my
custom components, etc) require this behavior.
Second - more meaningful - make a IBehavior. But it doesn't work. In
"bind" is to early to check model, but in "beforeRender" is too late
to change visibility.
Is there any other option?
--
WBR, kan.
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