[Feature request] Enhancing Controller Support for Form Fields in Amplify Authenticator UI

[angelorodem]

On which framework/platform would you like to see this feature implemented?

Flutter

Which UI component is this feature-request for?

Authenticator

Please describe your feature-request in detail.

Currently, the Amplify Authenticator UI for Flutter does not allow programmatic modification of form field values through a controller—unlike other conventional form fields. This limitation restricts use cases such as pre-populating a field with data retrieved from an API (for example, automatically setting a user’s address based on GPS coordinates) or auto-filling an SMS verification code.

To improve functionality and flexibility, it is recommended that the Authenticator UI Library, particularly the SignUpFormField, be extended to include controller support. This enhancement would enable developers to seamlessly manage form values, thereby expanding the component’s utility and improving overall user experience.

Please describe a solution you'd like.

Create a new controller class for the fields used in the Auth lib, and expose it on the form field.

[angelorodem]

i have tried to manually change the widget.state.field but it's not reactive, when i change it the forms do not update even on setState.

[tyllark]

Hello @angelorodem, thanks for taking the time to open this feature request. I think this is a good suggestion that would enable quality of life features for customers. While we would need to review what fields would support this, I believe we could support something like this:

final _usernameController = TextEditingController(text: 'MY_USERNAME');
final _emailController = TextEditingController(text: 'MY_EMAIL');
final _addressController = TextEditingController(text: 'MY_ADDRESS');

...

Authenticator(
      signUpForm: SignUpForm.custom(
        fields: [
          SignUpFormField.username(controller: _usernameController, validator: _validateUsername),
          SignUpFormField.email(controller: _emailController, required: true),
          SignUpFormField.password(),
          SignUpFormField.passwordConfirmation(),
          SignUpFormField.address(controller: _addressController),
        ],
      ),

...

_addressController.text = 'MY_OTHER_ADDRESS';

I'll mark this as a feature request and we will provide any updates here!

[angelorodem]

Ok, thanks @tyllark !
for my knowledge, do you have an ETA on mind?

Thank you.

[tyllark]

Hello @angelorodem, unfortunately we do not have an ETA at this time. When we do have an update we will post here.