alertDialog with textfield validator flutter
// Creates an alertDialog for the user to enter their email
Future<String> _resetDialogBox() {
return showDialog<String>(
context: context,
barrierDismissible: false, // user must tap button!
builder: (BuildContext context) {
return CustomAlertDialog(
title: "Reset email",
auth: _auth,
);
},
);
}
class CustomAlertDialog extends StatefulWidget {
final String title;
final FirebaseAuth auth;
const CustomAlertDialog({Key key, this.title, this.auth})
: super(key: key);
@override
CustomAlertDialogState createState() {
return new CustomAlertDialogState();
}
}
class CustomAlertDialogState extends State<CustomAlertDialog> {
final _resetKey = GlobalKey<FormState>();
final _resetEmailController = TextEditingController();
String _resetEmail;
bool _resetValidate = false;
StreamController<bool> rebuild = StreamController<bool>();
bool _sendResetEmail() {
_resetEmail = _resetEmailController.text;
if (_resetKey.currentState.validate()) {
_resetKey.currentState.save();
try {
// You could consider using async/await here
widget.auth.sendPasswordResetEmail(email: _resetEmail);
return true;
} catch (exception) {
print(exception);
}
} else {
setState(() {
_resetValidate = true;
});
return false;
}
}
@override
Widget build(BuildContext context) {
return Container(
child: AlertDialog(
title: new Text(widget.title),
content: new SingleChildScrollView(
child: Form(
key: _resetKey,
autovalidate: _resetValidate,
child: ListBody(
children: <Widget>[
new Text(
'Enter the Email Address associated with your account.',
style: TextStyle(fontSize: 14.0),
),
Padding(
padding: EdgeInsets.all(10.0),
),
Row(
children: <Widget>[
new Padding(
padding: EdgeInsets.only(top: 8.0),
child: Icon(
Icons.email,
size: 20.0,
),
),
new Expanded(
child: TextFormField(
validator: validateEmail,
onSaved: (String val) {
_resetEmail = val;
},
controller: _resetEmailController,
keyboardType: TextInputType.emailAddress,
autofocus: true,
decoration: new InputDecoration(
border: InputBorder.none,
hintText: 'Email',
contentPadding:
EdgeInsets.only(left: 70.0, top: 15.0),
hintStyle:
TextStyle(color: Colors.black, fontSize: 14.0)),
style: TextStyle(color: Colors.black),
),
)
],
),
new Column(children: <Widget>[
Container(
decoration: new BoxDecoration(
border: new Border(
bottom: new BorderSide(
width: 0.5, color: Colors.black))),
)
]),
],
),
),
),
actions: <Widget>[
new FlatButton(
child: new Text(
'CANCEL',
style: TextStyle(color: Colors.black),
),
onPressed: () {
Navigator.of(context).pop("");
},
),
new FlatButton(
child: new Text(
'SEND EMAIL',
style: TextStyle(color: Colors.black),
),
onPressed: () {
if (_sendResetEmail()) {
Navigator.of(context).pop(_resetEmail);
}
},
),
],
),
);
}
}
String validateEmail(String value) {
String pattern =
r'^(([^<>()[]\.,;:s@"]+(.[^<>()[]\.,;:s@"]+)*)|(".+"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$';
RegExp regExp = new RegExp(pattern);
if (value.length == 0) {
return "Email is required";
} else if (!regExp.hasMatch(value)) {
return "Invalid Email";
} else {
return null;
}
}