Getting the ListItems from a ListView

[Scott Sauyet <li...@sauyet.com>]

There may be a much better way of doing what I'm trying to do, and if 
so, I'd love to hear about it.  But what I thought would be simple seems 
to be eluding me here.

I have a form with a dynamic number of dropdowns.  I'm populating them 
using a ListView, and the display is working fine.  The trouble is that 
in my onSubmit(), I now need to get at the selections made for each, and 
I don't know how to get back the ListItems; the only methods which 
really seem to expose these are populateItem() and renderItem(), which 
run before onSubmit().  Is there a way to get at these?  Or can you 
suggest another way to structure this so that I have the access needed?

A little more explanation and some sample code is below.

Thanks,

   -- Scott Sauyet

The user is purchasing tickets in a section of some venue.  That section 
will have different buyer types, each with its own price, description, 
and maximum allowed tickets.  The user should be able to choose, for 
instance, two adult tickets, one senior ticket, and three child tickets. 
  But the buyer types available are data driven; I can't simply 
hard-code separate dropdowns for each.



     public static class SectionForm extends Form {
         private PriceSection section;

         public SectionForm(String id, PriceSection section) {
             super(id);
             this.section = section;
             add(new Label("section-description", section.toString()));
             List<BuyerType> buyerTypes = section.getBuyerTypes();
             add(new ListView("buyer-type", buyerTypes) {
                 public List<String> quantities;
                 public void populateItem(ListItem listItem) {
                     BuyerType buyerType = (BuyerType)
                                 listItem.getModelObject();
                     listItem.add(new Label("description",
                                 buyerType.getDescription()));
                     listItem.add(new Label("price",
                                 CURRENCY.format(buyerType.getPrice())));
                     quantities = allowedQuantities(buyerType);
                     listItem.add(new DropDownChoice("quantity",
                             new Model(quantities.get(0)), quantities));
                 }
             });
         }
         public void onSubmit() {
             System.out.println("Chose section " + section);
             ListView types = (ListView) get("buyer-type");
             System.out.println(((List) types.getModelObject())
                                              .get(0).getClass());
/// ????
             for (Object obj: types.?????()) { // What do I do here?
/// ????
                 ListItem item = (ListItem) obj;
                 BuyerType type = (BuyerType) item.getModelObject();
                 String choice = ((DropDownChoice) item.get("quantity"))
                                                       .getModelValue();
                 System.out.println("\t" + type.getDescription()
                     + ": " + choice + " @ "
                     + CURRENCY.format(type.getPrice()));
             }

         }
         // ...
     }


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Re: Getting the ListItems from a ListView

[Scott Sauyet <li...@sauyet.com>]

Scott Sauyet wrote:
> There may be a much better way of doing what I'm trying to do, and if 
> so, I'd love to hear about it.  But what I thought would be simple seems 
> to be eluding me here.

I knew there had to be a better way.  I found one.


> I have a form with a dynamic number of dropdowns.  I'm populating them 
> using a ListView, and the display is working fine.  The trouble is that 
> in my onSubmit(), I now need to get at the selections made for each, and 
> I don't know how to get back the ListItems; the only methods which 
> really seem to expose these are populateItem() and renderItem(), which 
> run before onSubmit().  Is there a way to get at these?  Or can you 
> suggest another way to structure this so that I have the access needed?

I wrapped the objects in the list that serves as the ListView model in a 
class that had a property that I could use for the model of the 
drop-down list.  It was pretty straightforward once I stopped trying to 
get the ListItems back.

Someday I'll have interesting questions to ask... :-(
   -- Scott


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