Hi,
Well, passing a parameter to the field to configure its validator is exactly
what I'm trying to do. The fields I need already take a parameter for this
purpose (i.e., t:validate), so it doesn't seem useful to extend them to use
Environmentals instead.
The issue here is that t:validate works well if you pass static text, for
instance: "required, regexp", but, if you want to dynamically decide on the
validators (i.e., by passing a property instead of a validate string), the
property requires the type *FieldValidator*.
Now it is possible to instantiate FieldValidators at render-time, but to
this end, you need a reference to the *Field* you want to pass the validator
to. For instance, if you're just /in a page/, this (thanks to Lance) works:
Java Page {
@Inject Field textField;
@Inject FieldValidatorSource fieldValidatorSource;
public FieldValidator getValidators() {
StringBuilder validators = new StringBuilder("a,b,c");
if (required) {
validators.append(",required");
}
return fieldValidatorSource.createValidators(textField,
validators.toString());
}
}
Corresponding Page TML {
<t:textfield t:id="textField" validate="prop:validators" />
}
Now I don't want to provide the property from within a page, but /from
within a custom component/ instead. More specifically, I'd like to do this:
Page TML {
<t:mycomponent>
<t:textfield t:id="textField" validate="var:validators" />
</t:mycomponent>
}
The component knows what validators are required, and I can bind the
validators render variable at render-time (i.e., exactly when I need it) so
that's ok, but, in order to bind it I need to create the FieldValidator, and
for the latter I need a reference to the field that's in the component's
body.
Therefore my question: how can I obtain a reference to this field (given its
ID), in the component, preferably in the setupRender phase (as I think the
validators variable should be bound at that time)?
PS: Things would be way easier if I could only bind a String with validators
to the render variable, and let Tapestry create the FieldValidators itself,
but that doesn't seem to work, cfr. earlier in the conversation (accessible
at
http://tapestry.1045711.n5.nabble.com/Is-it-possible-to-add-Field-validators-at-render-time-td5682920.html).
Wouter
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