dropdown and values added with jquery

[Michael Jaruska <mi...@gmail.com>]

Hi,

in my Page (not relevant code removed for simplicity) is dropdown:
public class MyPage extends WebBase{
     //perie
     private Model<Perie> modelPerie;
     //two values in dropdown:
     private List<Perie> perie = Arrays.asList(new Perie("start", "-Vyberte druh peří-"), new Perie("vsypek", "nové 806"));
     private DropDownChoice<Perie> vyberPeria;
     private ChoiceRendererPerie rendererPerie;
     public PageEshop(){
         this.rendererPerie = new ChoiceRendererPerie();
         this.modelPerie = new Model<Perie>(this.perie.get(0));
         this.vyberPeria = new DropDownChoice<Perie>("vyberPeria", this.modelPerie, this.perie, this.rendererPerie);
         MyForm form = new MyForm("inputForm");
         form.add(vyberPeria);
         this.add(form);
     }

     private class MyForm extends Form<Object>{
         public MyForm(String id){
             super(id);
         }

         @Override
         protected void onSubmit(){
             //with value added with jquery this produce error
             System.out.println(PageEshop.this.modelPerie.getObject().getHodnota());
         }
     }
}

and in relevant markup I add new choice in this dropdown with jquery:
<form wicket:id="inputForm">
     <div id="perie">
         <label>Typ peří:</label>
         <select id="2" wicket:id="vyberPeria"></select>
     </div>
     <script>
     jQuery(document).ready(
             function()
             {
		//-->this add another value into dropdown, now there are three values:
                 $('#2').append($('<option></option>').val('testkluc').html('testovaci text'));
             })
     </script>
</form>

Of course, when I select this added value ('testkluc') in dropdown and submit it, from onSubmit() I try to do something with this, I get error:
...
java.lang.reflect.InvocationTargetException
...PageEshop$MyForm.onSubmit(...

Yes, I know that this third value isn't in model so error is predictable. Question is: how to deal with situation when I need
add new value in HTML and this value isn't in my model in java?

Thanks,

MJ

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