More information: • Flutter.dev — Flutter form validation • Medium.com — Form validation in Flutter That second link includes this TextFormField example: new TextFormField( decoration: const InputDecoration(labelText: 'Name'), keyboardType: TextInputType.text, validator: (String arg) { ...
Should close #230 Bumped up flutter_typeahead from 1.7.0 to 1.8.0 [3.7.3] Bumped up intl, datetime_picker_formfield & flutter_chips_input. Closes #204, #207, #211, #215. Fixed deprecation errors [3.7.2] Fix email validator: Trim white-space before validation Return Form's value ...