Hi there,
I have been struggling for some time now to understand how
LoadableDetachableModel and a ListView work together. The starting point
was Chapter 5.5.2 of "Wicket in Action" where it is recommended to provide
your own ItemModel if the underlying list changes frequently. To try out
how Wicket behaves without such a custom ItemModel, I wrote the following
Test:
<body>
<em wicket:id="listview">
<span wicket:id="label"></span><a wicket:id="delete">delete</a>
</em>
</body>
LoadableDetachableModel model = new LoadableDetachableModel() {
@Override
protected Object load() {
System.out.println("load");
return Arrays.asList(new TestItem[] {
new TestItem("a" + Math.random()),
new TestItem("b" + Math.random()),
new TestItem("c" + Math.random()) });
}
protected void onDetach() {
System.out.println("detach");
}
};
ListView listview = new ListView("listview", model) {
protected void populateItem(ListItem item) {
final TestItem itemModel = (TestItem) item.getModelObject();
item.add(new Label("label", itemModel.toString()));
item.add(new Link("delete") {
@Override
public void onClick() {
System.out.println("Delete " + itemModel);
}
});
}
};
add(listview);
Now, I would expect that when I hit the "delete" link, Wicket would call the
"load" Method of the LoadableDetachableModel before printing "Delete..." as the
default implementation will use the index and the list to determine the item to
delete. To my surprise, however, the "Delete..." message is printed with the
correct item and the "load" Method is called afterwards. In my understanding,
this contradicts the idea of the LoadableDetachableModel since Wicket seems to
have a copy of the original list somewhere so that it can determine the list
item on which the action was invoked before loading the underlying list.
Can someone spot my mistake?
Thanks,
J.
--
Dr. Jürgen Lind
iteratec GmbH Fon: +49 (0)89 614551-44
Inselkammerstrasse 4 Fax: +49 (0)89 614551-10
82008 Unterhaching Web: www.iteratec.de
Sitz und Registergericht der iteratec GmbH: München HRB 113 519
Geschäftsführer: Klaus Eberhardt, Mark Goerke, Inge Hanschke, Ralf Menzel
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
