Hi!
I am trying to move the validation logic definition from the tml back to the
"application source code", because my Hibernate domain model drives the
required and length constrains anyway.
So I wonder why all checks have to be declared by "t:validation" on the "gui"
side redundently. The basic idea is to have a ModelValidator which implements
the Tapestry Validator interface and assembles other Validator based on the
model, more precise the column annotation of the model.
So I wrote the validator and created an instance by my AppModule wihthin a
contribute method. Worked fine.
Inside the tml the following code snipped binds the textfield and the new
validator:
<input type="text" t:id="userAddressId"
t:validate="modelValidation=Address.userId"/>
which means: please take all validations from column "userId" of bean
"Address". In my validation class I tried to reuse all existing Tapestry
validators by using the "formSupport".
public class ModelValidator ...
{
...
public void render(final Field field, final String constraintValue, final
MessageFormatter formatter,
final MarkupWriter writer, final FormSupport formSupport)
{
// hardcoded for testing.
if (constraintValue.equals("Address.userId")) {
formSupport.addValidation(field, "maxLength", "my maxLength message
to build", new Long(10));
formSupport.addValidation(field, "required", "my required message to
build", null);
}
}
....
}
Everything works but then I get an error message within the browser complaining
"Function Tapestry.Validator.maxLength() does not exist for Field
'userAddressId'. Well, unfortunately that's right :-(
Which further steps are required to create the missing java script code which I
guess is created by Tapestry when parsing the t:validation entry in the tml?
Seems Tapestry does a lot of magic behind the scenes and I really do not know
where to start..
But: In case there is another validation solution to keep the rules inside the
application and not the gui I am also interested in.
Thanks in advance
Jens
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