PropertyChangeHandler for Chained Bindings

[holsen]

Hello there,

is there any way to add a PropertyChangeHandler for chained bindings?

@Inject @AutoBound DataBinder<User> dataBinder;

@Inject @DataField @Bound String name;

dataBinder.addPropertyChangeHandler(new PropertyChangeHandler<User>() {

            @Override

            public void onPropertyChange( PropertyChangeEvent<User> event ) {

                //do something

            }

});

Works just fine, however

@Inject @AutoBound DataBinder<User> dataBinder;

@Inject @DataField @Bound(property="adress.street") String street;

dataBinder.addPropertyChangeHandler(new PropertyChangeHandler<User>() {

            @Override

            public void onPropertyChange( PropertyChangeEvent<User> event ) {

                //do something

            }

});

Won't trigger a change event. I could of course add a ValueChangeHandlers to each widget. But when those fire the DataBinder hasn't received the updated value yet. Currently my inline validation relies on the whole data object (JSR 303), so I can't really use the widget's ValueChangeHandlers.

I'm using Errai 2.3.2 Final.  Any ideas?

Thanks!!

Chris

[csa]

Hi Chris,

The two code snippets you pasted seem identical but essentially I think you need this to work:

binder.addPropertyChangeHandler("customer.address.streetname", handler);

This should work with the latest 2.4.0-SNAPSHOTs. The final release is planned for September.

Cheers,

Christian

[holsen]

Hi Christian,

ups, the forum software somehow hides Java Code when using quotatations. Just edited my post above.

I'll have a look at the latest snapshots. Is it also possible to add a ChangeHandler to a whole chained object, e.g.

binder.addPropertyChangeHandler("customer.address", handler);

so that whenever the streetname, ZIP etc. changes a ValueChangeEvent is fired?

Thank you so much for your help!!!

Chris

[csa]

Hi Chris,

The property change handler for "customer.address" will fire when the corresponding address reference (the address field of the customer field in your model) changes. It will not fire for e.g. the streetname. You will need to use a handler on "customer.address.streetname" for that.

We could add support for wildcards to differentiate between the two different use cases. So, basically add support for "customer.address.*". Can you create a JIRA for that with your use case if you want this feature?

Thanks,

Christian

[csa]

Link to the JIRA for wildcard support when registering property change handlers:

[#ERRAI-626] Support for wildcards and cascading when registering property change handlers - JBoss Issue Tracker