Validate multiple form fields together?

[Christian Mittendorf <ch...@freenet.de>]

Hello!

I was making up my mind about how to handle validation for multiple  
form fields, but I don't get it yet. Lets start with an example:

A bank account contains an account number and a bank code. There are  
methods available that can validate if both values together are a  
valid combination or not.

Thus I created a component that is responsible for displaying this  
information inside a form. It mainly consists of two text fields. The  
component has one parameter, a BankData object.

Each of these fields can have a validator assigned taking care of  
null values, the format, etc. That is one part of the validation  
process.

I then created a BankDataValidator implementing the Validator  
interface and assigning it to the component. However, that is not  
working because my BankData component is a simple BaseComponent and  
not extending form field component. The idea might be right, but  
technically I think I'm on the wrong way.

I can, of course, validate both field in my listener method, that is  
not a problem. But I would like to bundle the validation logic with  
the BankData component and keep it inside the component and not  
within a listener method. Very much like the validation for each form  
field is bound to the field and not the listener method,

Any hint and idea on a "how to" would be great!  Thanks in advance!

Christian
  

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