I believe this is a variable reference issue.
// instead of this....
isbnField.add(new AjaxFormComponentUpdatingBehavior("onchange") {...@override
protected void onUpdate(final AjaxRequestTarget target) {try {book =
bookRetriever.getBook(isbnField.getInput());
// try this....@overrideprotected void onUpdate(final AjaxRequestTarget target)
{try {book = bookRetriever.getBook(isbnField.getInput());setDefaultModel(new
CompoundPropertyModel<Book>(book));modelChanged();
When you passed in book to the constructor, it now has a reference to your book
object, when you execute this line:
book = bookRetriever.getBook(isbnField.getInput());
you are only changing the value of the variable book, but not the reference
stored in new CompoundPropertyModel<Book>(book). You should be able pull that
off in C++ by changing the value of the pointer, but you can't do that in java.
It is similar to this short code
String y = "example";java.util.HashMap h = new
java.util.HashMap();h.put("y",y);// changing the value of y y="not you";// see
that the value of y is not the same as the reference we stored in the
hashmapSystem.out.println(h.get("y"));System.out.println(y);
I hope that helps.
Russ
> Date: Thu, 13 Aug 2009 09:15:50 +0200
> From: [email protected]
> To: [email protected]
> Subject: Re: Ajax based filling of form
>
> Well the model doesn't update. (Not that I'd expect it to.)
>
> Here's some pieces of my code I deem relevant to the problem.
>
>
> if (key == null || key.getIsbn() == null) {
> book = new Book();
> } else {
> book = bookRetriever.getBook(key.getIsbn(), key.getCollectionId());
> }
>
> setDefaultModel(new CompoundPropertyModel<Book>(book));
>
> // ...
>
> isbnField.add(new AjaxFormComponentUpdatingBehavior("onchange") {
> private static final long serialVersionUID = 1L;
>
> @Override
> protected void onUpdate(final AjaxRequestTarget target) {
> try {
> book = bookRetriever.getBook(isbnField.getInput());
> modelChanged();
>
> target.addComponent(titleField);
> //...
> target.addComponent(genrefield);
> } catch (SQLException e) {
> //...
> }
> }
> });
>
> John Krasnay wrote:
> > Sounds like you're on the right track. What's the problem?
> >
> > jk
> >
> > On Wed, Aug 12, 2009 at 04:27:41PM +0200, Linda van der Pal wrote:
> >
> >> I have a panel with a form. This form has several fields, one of which
> >> is the ISBN of a book. The fields are filled by a CompoundPropertyModel
> >> if the user is editing his previous entry, and they are empty if the
> >> user is adding a new book. Simply entering data or updating it and then
> >> submitting already works. But now I want to fetch the data for the other
> >> fields if the ISBN is already in the database. It is a multi-user
> >> system, so it is in fact possible that the ISBN is already in there.
> >>
> >> I was thinking of achieving this with AJAX, but I'm not really sure how
> >> to do it. I was thinking of adding an AjaxFormComponentUpdatingBeavior,
> >> where all the related fields are added to the target. But as the ISBN is
> >> part of the model, I don't really now how to get this working. Any hints
> >> on what direction I should be searching in?
> >>
> >> Regards,
> >> Linda
> >>
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