How to create JSF form with AJAX data validation

Question

I\'m working on a JSF form prototype for inserting data into database table using AJAX data validation This is the JSF page:

Answer 1

You need to create a Validator.

Kickoff example:

@FacesValidator("sessionIdValidator")
public class SessionIdValidator implements Validator {

    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        // ...

        if (yourDataService.existSessionId(value)) {
            throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
                "Session ID is already in use, please choose another.", null));
        }
    }

}

Use it as follows:

Note that you should use a to show validation messages. You haven't any one in your view. Apply the same for all your other fields:

---

If you want to use @Resource or @EJB or @Inject in the validator, then replace the @FacesValidator annotation by @ManagedBean or (as you seem to use CDI for some reason) @Named:

@Named
public class SessionIdValidator implements Validator {

    @Resource
    private DataSource dataSource;

    @Inject
    private YourDataService yourDataService;

    // ...
}

and use it as follows instead