How do I reset my reset the Currentstate of this application - flutter

Question

Please, how do i reset my currentstate Navigator such that when user type in the text field, the error message goes off instead of remaining until they hit the SUBMIT button. I know it's the use of the unChanged function, but I cant really figure that out.
Please, kindly help out. I have also attached my code below.
Thank you.
class ForgotPwd extends StatefulWidget {
#override
_ForgotPwdState createState() => _ForgotPwdState();
}
class _ForgotPwdState extends State<ForgotPwd> {
final TextEditingController _popEditingController = TextEditingController();
final _formKey = GlobalKey<FormState>();
#override
Widget build(BuildContext context) {
return Dialog(
child: Stack(
children: [
Container(
height: 270.0,
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(
Radius.circular(10.0),
),
),
child: Padding(
padding: EdgeInsets.only(top: 40.0),
child: Form(
key: _formKey,
child: Column(children: [
Text(
'Forgot Password?',
style: TextStyle(
fontFamily: 'Work Sans',
fontSize: 18.0,
color: Color(0XFF25282B),
fontWeight: FontWeight.w600),
),
Padding(
padding:
EdgeInsets.only(left: 20.0, right: 20.0, top: 30.0),
child: TextFormField(
validator: (value) {
if (value.isEmpty == true) {
return 'Please enter email address';
} else {
return null;
}
},
controller: _popEditingController,
keyboardType: TextInputType.emailAddress,
decoration: InputDecoration(
prefixIcon: Icon(FontAwesomeIcons.envelope),
labelStyle: TextStyle(fontSize: 15.0),
hintText: 'Enter your email address',
hintStyle: TextStyle(fontSize: 15.0),
border: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.black))),
),
),
Padding(
padding: EdgeInsets.all(30.0),
child: RaisedButton(
shape: RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(10.0)),
color: Color(0XFFC20370),
onPressed: () {
setState(() {
if (_formKey.currentState.validate()) {
Navigator.of(context)
.pop(_popEditingController.text.toString());
}
});
},
child: Text('SUBMIT',
style: TextStyle(
color: Colors.white,
fontFamily: 'Work Sans',
fontSize: 18.0,
fontWeight: FontWeight.w600)),
))
]),
),
),
),
],
),
);
}
}

Answer 1

You can call _formKey.currentState.validate() in the onChanged method of the textfield