Consider following form which uses ListView with pull model.
public MyForm extends Form {
public MyForm(String id, IModel model) {
super(id, model);
add(new ListView("items") {
public IModel getModel() {
return new Model(dao.findAll());
}
protected void populateItem(final ListItem item) {
FormComponent text1 = new TextField("t1");
FormComponent text2 = new TextField("t2");
item.add(text1);
item.add(text2);
MyForm.this.add(new MyFormValidator(text1, text2));
}
};
}
protected void onSubmit() {
// hello world!
}
}
Now, the first submit is ok, but if the validation fails during the
first submit and the user presses submit again, the whole form fails to
Caused by: java.lang.IllegalStateException: No Page found for component
[MarkupContainer [Component id = TextField.text, page = <No Page>, path
= 1:semester.length:start:TextField.text]]
at wicket.Component.getPage(Component.java:1022)
at wicket.Component.hasErrorMessage(Component.java:1226)
at
wicket.markup.html.form.FormComponent.isValid(FormComponent.java:442)
...
Why? Because the Form instance contains FormValidators which reference
old instances of FormComponents. These old instances are not in a Form
after the first submit because the ListView uses pull model and
therefore can't call setReuseItems(true);
So, it seems that it is not possible to use pull model ListView in a
Form?
Joni
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