On 11.5.2012 12:21, Andrea Del Bene wrote:
Hi,
the type of the model and of the renderer must be the same chosen for the
DropDownChoice (Vyrobok in your case). In the first version of your code this
was not
true for your model because it pointed to a String field (named "kluc").
Your second version works fine because you don't provide a property expression
to PropertyModel (is null) and doing so the property model considers as model
object the first parameter of its constructor (defaultChoice in your case),
which is an instance of class Vyrobok.
But at this point it does not make much sense to use a PropertyModel, you could
substitute it with a Model class, like this:
Model.of(defaultChoice)
just now I have elaborated that this works:
DropDownChoice<Vyrobok> vyberVyrobku = new DropDownChoice<Vyrobok>("vyberVyrobku",
new PropertyModel<Vyrobok>(defaultChoice, null), vyrobky, renderer);
(note `null' in PropertyModel)
but strange is that I don't know why :-(
yes, now I see, mea culpa
thanks for pointing me this
On 11.5.2012 9:36, Sven Meier wrote:
Hi,
Vyrobok defaultChoice = vyrobky.get(0);
DropDownChoice<Vyrobok> vyberVyrobku =
new DropDownChoice<Vyrobok>(
"zoznam",
new PropertyModel<Vyrobok>(defaultChoice, "kluc"),
vyrobky,
renderer);
you're instructing the DropDownChoice to get its model object from your
defaultChoice:
new PropertyModel<Vyrobok>(defaultChoice, "kluc")
This is probably not what you've intended as Kluc is a String. Something like
the following would make more sense:
this.selectedChoice = vyrobky.get(0);
new PropertyModel<Vyrobok>(this, "selectedChoice")
Sven
On 05/11/2012 09:16 AM, Michael Jaruska wrote:
Hi folks,
after hours of elaborating, searching docu and trying I'm totaly lost. My
ChoiceRenderer is not
working.
Here is my code (not relevant code has been removed):
markup:
<select id="1" wicket:id="zoznam"></select>
page implementation:
public class PageEshop extends PageBase{
public PageEshop(){
ChoiceRendererVyrobok renderer = new ChoiceRendererVyrobok();
List<Vyrobok> vyrobky = Arrays.asList(new Vyrobok("start", "-Vyberte typ-"), new Vyrobok("polstar",
"Polštář"), new Vyrobok("deka", "Deka"));
Vyrobok defaultChoice = vyrobky.get(0);
DropDownChoice<Vyrobok> vyberVyrobku = new DropDownChoice<Vyrobok>("zoznam", new
PropertyModel<Vyrobok>(defaultChoice, "kluc"), vyrobky, renderer);
Form<Object> form = new Form<Object>("inputForm");
form.add(vyberVyrobku);
this.add(form);
}
}
pojo:
public class Vyrobok implements Serializable{
private String kluc;
private String hodnota;
public Vyrobok(String kluc, String hodnota){
this.kluc = kluc;
this.hodnota = hodnota;
}
//getters and setters for attributes
}
IChoiceRenderer implementation:
public class ChoiceRendererVyrobok implements IChoiceRenderer<Vyrobok>{
@Override
public Object getDisplayValue(Vyrobok vyrobok){
return vyrobok.getHodnota();
}
@Override
public String getIdValue(Vyrobok vyrobok, int index){
return vyrobok.getKluc();
}
}
When page is loaded, this error happens (not complete stack, not relevant
removed):
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to
cz.polstareadeky.utils.Vyrobok
at
cz.polstareadeky.ChoiceRendererVyrobok.getIdValue(ChoiceRendererVyrobok.java:1)
at
org.apache.wicket.markup.html.form.AbstractSingleSelectChoice.getModelValue(AbstractSingleSelectChoice.java:194)
at
org.apache.wicket.markup.html.form.FormComponent.getValue(FormComponent.java:837)
Something is wrong in ChoiceRendererVyrobok but I can't find what..
Any help is apreciated,
thanks, Michal
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