Accept errorText as callback and pass validation parameters to the callback function

[e200]

Accept errorText as callback and pass validation parameters to the callback function so people can dynamically return a different text error message with the required values.

FormBuilderTextField(
       attribute: 'last_name',
       maxLines: 1,
       decoration: InputDecoration(labelText: 'Último nome'),
       validators: [
            FormBuilderValidators.minLength(
                     3,
                     errorText: (value, minLength) {
                          return `${value} must be greater then ${minLength}`;
                     },
             ],
       ),
)

[danvick]

Hi @e200,
This sounds like a nice idea.

However, it would be a bit challenging to pull off on this package based on the implementation of FormFieldValidator.

[e200]

:(

[danvick]

I know. I'm sorry.

PR welcome though. Or get some votes on the issue.