16
});
}
}
In the example above we used a version of which takes as input the class of the targetsetResponsePage
page. In this way a new instance of will be created each time we click on the link. The otherAnotherPage
version of takes in input a page instance instead of a page class:setResponsePage
@Override
void onClick() { public
//we redirect browser to another page.
AnotherPage anotherPage = AnotherPage();new
setResponsePage(anotherPage);
}
The difference between using the first version of rather than the second one will besetResponsePage
illustrated in , when we will introduce the topic of stateful and stateless pages. For now, we canchapter 8
consider them as equivalent.
Like many other Wicket components, is lambda-friendly and comes with a factory method called Link onClick
which leverages lambda expressions to specify handler method:
public class HomePage WebPage {extends
HomePage(){public
add(Link.onClick( , () -> setResponsePage(AnotherPage.class));"id"
}
}
The lambda expression is converted into a , which isorg.apache.wicket.lambda.WicketConsumer
basically a serializable version of (we will see later why we need it to bejava.util.function.Consumer<T>
serializable).
Wicket comes with a rich set of link components suited for every need (links to static URL, Ajax-enhanced links,
links to a file to download, links to external pages and so on). We will see them in .chapter 10
We can specify the content of a link (i.e. the text of the picture inside it) with its method
. This method takes in input a generic Wicket model, which will be the topic of setBody
.chapter 11
4.5 Summary
In this chapter we have seen the basic elements that compose a Wicket application. We have started preparing
the configuration artifacts needed for our applications. As promised in , we needed to put in place justchapter 2.4
a minimal amount of XML with an application class and a home page. Then we have continued our “first contact”
with Wicket learning how to build a simple page with a label component as child. This example page has shown
us how Wicket maps components to HTML tags and how it uses both of them to generate the final HTML
markup. In the last paragraph we had a first taste of Wicket links and we have seen how they can be considered
as a “click” event listener and how they can be used to navigate from a page to another.
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