I'm unable to find a way to create an input field in Flutter that would open up a numeric keyboard. Is this possible with Flutter material widgets? Some github discussions seem to indicate this is a supported feature but I'm unable to find any documentation about it.
17 Answers
428
votes
You can specify the number as keyboardType for the TextField using:
keyboardType: TextInputType.number
Check my main.dart file
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
// TODO: implement build
return new MaterialApp(
home: new HomePage(),
theme: new ThemeData(primarySwatch: Colors.blue),
);
}
}
class HomePage extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return new HomePageState();
}
}
class HomePageState extends State<HomePage> {
@override
Widget build(BuildContext context) {
return new Scaffold(
backgroundColor: Colors.white,
body: new Container(
padding: const EdgeInsets.all(40.0),
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new TextField(
decoration: new InputDecoration(labelText: "Enter your number"),
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.digitsOnly
], // Only numbers can be entered
),
],
)),
);
}
}
149
votes
For those who are looking for making TextField or TextFormField accept only numbers as input, try this code block :
for flutter 1.20 or newer versions
TextFormField(
controller: _controller,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.allow(RegExp(r'[0-9]')),
],
decoration: InputDecoration(
labelText: "whatever you want",
hintText: "whatever you want",
icon: Icon(Icons.phone_iphone)))
for earlier versions of 1.20
TextFormField(
controller: _controller,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
WhitelistingTextInputFormatter.digitsOnly
],
decoration: InputDecoration(
labelText:"whatever you want",
hintText: "whatever you want",
icon: Icon(Icons.phone_iphone)
)
)
65
votes
Through this option you can strictly restricted another char with out number.
inputFormatters: [WhitelistingTextInputFormatter.digitsOnly],
keyboardType: TextInputType.number,
For using above option you have to import this
import 'package:flutter/services.dart';
using this kind of option user can not paste char in a textfield
24
votes
Set the keyboard and a validator
String numberValidator(String value) {
if(value == null) {
return null;
}
final n = num.tryParse(value);
if(n == null) {
return '"$value" is not a valid number';
}
return null;
}
new TextFormField(
keyboardType: TextInputType.number,
validator: numberValidator,
textAlign: TextAlign.right
...
13
votes
For those who need to work with money format in the text fields:
To use only: , (comma) and . (period)
and block the symbol: - (hyphen, minus or dash)
as well as the: ⌴ (blank space)
In your TextField, just set the following code:
keyboardType: TextInputType.numberWithOptions(decimal: true),
inputFormatters: [BlacklistingTextInputFormatter(new RegExp('[\\-|\\ ]'))],
The simbols hyphen and space will still appear in the keyboard, but will become blocked.
7
votes
You can use this two attributes together with TextFormField
TextFormField(
keyboardType: TextInputType.number
inputFormatters: [WhitelistingTextInputFormatter.digitsOnly],
It's allow to put only numbers, no thing else ..
https://api.flutter.dev/flutter/services/TextInputFormatter-class.html
7
votes
The TextField widget is required to set keyboardType: TextInputType.number,
and inputFormatters: <TextInputFormatter>[FilteringTextInputFormatter.digitsOnly] to accept numbers only as input.
TextField(
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.digitsOnly
], // Only numbers can be entered
),
Example in DartPad
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: HomePage(),
theme: ThemeData(primarySwatch: Colors.blue),
);
}
}
class HomePage extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return HomePageState();
}
}
class HomePageState extends State<HomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: Container(
padding: const EdgeInsets.all(40.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("This Input accepts Numbers only"),
SizedBox(height: 20),
TextField(
decoration: InputDecoration(
focusedBorder: OutlineInputBorder(
borderSide:
BorderSide(color: Colors.greenAccent, width: 5.0),
),
enabledBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.red, width: 5.0),
),
hintText: 'Mobile Number',
),
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.digitsOnly
], // Only numbers can be entered
),
SizedBox(height: 20),
Text("You can test be Typing"),
],
)),
);
}
}
3
votes
3
votes
Here is code for actual Phone keyboard on Android:
Key part: keyboardType: TextInputType.phone,
TextFormField(
style: TextStyle(
fontSize: 24
),
controller: _phoneNumberController,
keyboardType: TextInputType.phone,
decoration: InputDecoration(
prefixText: "+1 ",
labelText: 'Phone number'),
validator: (String value) {
if (value.isEmpty) {
return 'Phone number (+x xxx-xxx-xxxx)';
}
return null;
},
),
3
votes
2
votes
You can Easily change the Input Type using the keyboardType Parameter and you have a lot of possibilities check the documentation TextInputType so you can use the number or phone value
new TextField(keyboardType: TextInputType.number)
2
votes
keyboardType: TextInputType.number would open a num pad on focus, I would clear the text field when the user enters/past anything else.
keyboardType: TextInputType.number,
onChanged: (String newVal) {
if(!isNumber(newVal)) {
editingController.clear();
}
}
// Function to validate the number
bool isNumber(String value) {
if(value == null) {
return true;
}
final n = num.tryParse(value);
return n!= null;
}
2
votes
If you need to use a double number:
keyboardType: TextInputType.numberWithOptions(decimal: true),
inputFormatters: [FilteringTextInputFormatter.allow(RegExp('[0-9.,]')),],
onChanged: (value) => doubleVar = double.parse(value),
RegExp('[0-9.,]') allows for digits between 0 and 9, also comma and dot.
double.parse() converts from string to double.
Don't forget you need:
import 'package:flutter/services.dart';
2
votes
As the accepted answer states, specifying keyboardType triggers a numeric keyboard:
keyboardType: TextInputType.number
Other good answers have pointed out that a simple regex-based formatter can be used to allow only whole numbers to be typed:
inputFormatters: [
FilteringTextInputFormatter.allow(RegExp(r'[0-9]')),
],
The problem with this is that the regex only matches one symbol at a time, so limiting the number of decimal points (e.g.) cannot be achieved this way.
Also, others have also shown that if one wants validation for a decimal number, it can be achieved by using a TextFormField and it's validator parameter:
new TextFormField(
keyboardType: TextInputType.number,
validator: (v) => num.tryParse(v) == null ? "invalid number" : null,
...
The problem with this is that it cannot be achieved interactively, but only at form submission time.
I wanted to allow only decimal numbers to be typed, rather than validated later. My solution is to write a custom formatter leveraging int.tryParse:
/// Allows only decimal numbers to be input.
class DecimalNumberFormatter extends TextInputFormatter {
@override
TextEditingValue formatEditUpdate(
TextEditingValue oldValue, TextEditingValue newValue) {
// Allow empty input and delegate formatting decision to `num.tryParse`.
return newValue.text != '' && num.tryParse(newValue.text) == null
? oldValue
: newValue;
}
}
Alternatively, one can use a regex for the custom formatter, which would apply to the whole input, not just a single symbol:
/// Allows only decimal numbers to be input. Limits decimal plates to 3.
class DecimalNumberFormatter extends TextInputFormatter {
@override
TextEditingValue formatEditUpdate(
TextEditingValue oldValue, TextEditingValue newValue) {
// Allow empty input.
if (newValue.text == '') return newValue;
// Regex: can start with zero or more digits, maybe followed by a decimal
// point, followed by zero, one, two, or three digits.
return RegExp('^\\d*\\.?\\d?\\d?\\d?\$').hasMatch(newValue.text)
? newValue
: oldValue;
}
}
This way, I can also limit the number of decimal plates to 3.
0
votes
Here is code for numeric keyboard : keyboardType: TextInputType.phone When you add this code in textfield it will open numeric keyboard.
final _mobileFocus = new FocusNode();
final _mobile = TextEditingController();
TextFormField(
controller: _mobile,
focusNode: _mobileFocus,
maxLength: 10,
keyboardType: TextInputType.phone,
decoration: new InputDecoration(
counterText: "",
counterStyle: TextStyle(fontSize: 0),
hintText: "Mobile",
border: InputBorder.none,
hintStyle: TextStyle(
color: Colors.black,
fontSize: 15.0.
),
),
style: new TextStyle(
color: Colors.black,
fontSize: 15.0,
),
);
0
votes
You can use Form Builder Package to display any type of form field. For number input field,
FormBuilderTextField(
keyboardType: TextInputType.number,
validators: [
FormBuilderValidators.numeric(),
],
),
0
votes
U can Install package intl_phone_number_input
dependencies:
intl_phone_number_input: ^0.5.2+2
and try this code:
import 'package:flutter/material.dart';
import 'package:intl_phone_number_input/intl_phone_number_input.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
var darkTheme = ThemeData.dark().copyWith(primaryColor: Colors.blue);
return MaterialApp(
title: 'Demo',
themeMode: ThemeMode.dark,
darkTheme: darkTheme,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(title: Text('Demo')),
body: MyHomePage(),
),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final GlobalKey<FormState> formKey = GlobalKey<FormState>();
final TextEditingController controller = TextEditingController();
String initialCountry = 'NG';
PhoneNumber number = PhoneNumber(isoCode: 'NG');
@override
Widget build(BuildContext context) {
return Form(
key: formKey,
child: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
InternationalPhoneNumberInput(
onInputChanged: (PhoneNumber number) {
print(number.phoneNumber);
},
onInputValidated: (bool value) {
print(value);
},
selectorConfig: SelectorConfig(
selectorType: PhoneInputSelectorType.BOTTOM_SHEET,
backgroundColor: Colors.black,
),
ignoreBlank: false,
autoValidateMode: AutovalidateMode.disabled,
selectorTextStyle: TextStyle(color: Colors.black),
initialValue: number,
textFieldController: controller,
inputBorder: OutlineInputBorder(),
),
RaisedButton(
onPressed: () {
formKey.currentState.validate();
},
child: Text('Validate'),
),
RaisedButton(
onPressed: () {
getPhoneNumber('+15417543010');
},
child: Text('Update'),
),
],
),
),
);
}
void getPhoneNumber(String phoneNumber) async {
PhoneNumber number =
await PhoneNumber.getRegionInfoFromPhoneNumber(phoneNumber, 'US');
setState(() {
this.number = number;
});
}
@override
void dispose() {
controller?.dispose();
super.dispose();
}
}
