On 3/15/08, Matej Knopp <[EMAIL PROTECTED]> wrote:
> Not wit url like http://localhost:8080/. That's a homepage URL. It
> doesn't contain any information about page instance, etc. so wicket
> has to create new page instance.
>
> Transparent back button support is about something else. Wicket tracks
> certain changes to page, i.e. adding or removing components which
> triggers new page version. But in order to revert to previos page
> version the URL must be either a listener interface url
> (?wicket:interface=...) or a hybrid URL. So you can try to mount your
> home page using HybridUrlCodingStrategy. Also just incrementing a
> property will not trigger new page version. Wicket can't introspect
> every property in your component hierarachy to determine that a new
> page version should be created, that would be way too slow.
>
> To get wicket to create new page version when you increment your
> counter you might want to call label.modelChanging() on your link
> click handler. (You need to do this because you are just incrementing
> a property, not changing component hierarchy or something else that
> wicket can detect).
>
> When new page version is created you should see a version number
> incrementing in your url. On back button the URL should contain
> previous version number.
>
Ok, I've followed your instructions. Here's my new Application class:
public class WicketApplication extends WebApplication
{
protected void init()
{
mount(new HybridUrlCodingStrategy("/Home.page", HomePage.class));
}
public Class getHomePage()
{
return HomePage.class;
}
}
Here's my HomePage class:
public class HomePage extends WebPage
{
private static final long serialVersionUID = 1L;
private static final Logger log = LoggerFactory.getLogger(HomePage.class);
private int counter;
public HomePage()
{
log.info("I'm (identity " + System.identityHashCode(this) + ")
being instantiated." );
final Label label = new Label("message", new LoadableDetachableModel()
{
protected Object load()
{
return "I've been called " + counter + " times.";
}
});
add(label);
add(new Link("refreshLink")
{
public void onClick()
{
counter++;
log.info("I'm being called on object with identity " +
System.identityHashCode(HomePage.this));
label.modelChanging();
}
});
}
protected Object writeReplace() throws ObjectStreamException
{
final Object replacement = super.writeReplace();
log.info("I'm (identity " + System.identityHashCode(this) + ")
being write replaced by object " + replacement);
return replacement;
}
}
When I go to http://localhost:8080/, it redirects me to
http://localhost:8080/Home.page.0 and that generates the following
HTML:
<html>
<head>
<title>Wicket Quickstart Archetype Homepage</title>
</head>
<body>
<strong>Wicket Quickstart Archetype Homepage</strong>
<br/><br/>
<span wicket:id="message">I've been called 0 times.</span>
<p>
Click <a
href="?wicket:interface=:0:refreshLink::ILinkListener::"
wicket:id="refreshLink">here
</a> to refresh me!
</p>
</body>
</html>
Now, when I click the link, the URL changes to
http://localhost:8080/Home.page.0.1. So, the back button works and
shows me exactly what I wanted to see! Thank you for all your help!
By the way, modelChanged() and modelChanging() do two completely
different things! It doesn't work if I try modelChanged(), but it
does work if I do modelChanging(). It's not completely obvious what
the distinction is from the Javadocs (when do you call one vs. the
other). We might want to explain it a bit better.
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