I need to change the keyboard dynamically. the keyboard starts in TextInputType.text, when the user types 3 letters it is switched to TextInputType.number and the user types 4 numbers. ex: ABC1234.
final _controller = TextEditingController();
TextFormField(
decoration: InputDecoration(
labelText: "code",
hintText: 'ABC1234'),
controller: _myController,
keyboardType: TextInputType.text,
),
To change your TextInputType dynamically, what you can do is:
final _controller = TextEditingController();
//Creating a variable to store the type and initializing it with the default text type.
var keyboardType = TextInputType.text;
TextFormField(
decoration: InputDecoration(
labelText: "code",
hintText: 'ABC1234'),
controller: _myController,
//Passing the variable created in here
keyboardType: keyboardType,
onChanged: (value) {
//Checking if the value's length is less than 4, if it is, it should be type `text`.
if(value.isEmpty || value.length < 4) {
setState(() => keyboardType = TextInputType.text);
} else {
//Else, it should be type `number`
setState(() => keyboardType = TextInputType.number);
}
}
),
The will change the keyboard type dynamically but it may not change the keyboard, and you may have to close and open the keyboard again.
You can use keyboardType like this. It will be for both numbers and letters.
keyboardType: TextInputType.visiblePassword
Here is your working code
The keyboard is also changed automatically
final _controller = TextEditingController();
late FocusNode myFocusNode = FocusNode();
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: Center(
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 20),
child: TextFormField(
style: Theme.of(context).textTheme.bodyText2,
controller: _controller,
focusNode: myFocusNode,
textCapitalization: TextCapitalization.characters,
keyboardType: (_controller.text.length >= 3) ? TextInputType.number : TextInputType.name,
onChanged: (text) {
if (_controller.text != text.toUpperCase()) {
_controller.value = _controller.value.copyWith(text: text.toUpperCase());
}
if (_controller.text.length == 3){
setState(() {
myFocusNode.unfocus();
Future.delayed(const Duration(milliseconds: 50)).then((value) {
myFocusNode.requestFocus();
});
});
}
},
inputFormatters: [
FilteringTextInputFormatter.allow(
RegExp('[a-zA-Z0-9]'))
],
decoration: const InputDecoration(labelText: 'ABC1234')),
),
),
);
}
Output:
Declare a variable like your controller for keyboardtype, where keyboardtype is variable and TextInputTupe is it's datatype.
TextInputType keyboardtype = TextInputType.text;
now, check yout textformfield's String, If your string.length is greater than 3 then keyboard type is TextInputType.number
check the length into onchanged in textformfield
final _controller = TextEditingController();
TextInputType keyboardType = TextInputType.text;
TextFormField(
decoration: InputDecoration(
labelText: "code",
hintText: 'ABC1234'),
controller: _myController,
keyboardType: TextInputType.text,
onChanged: (value){
var inputText = _myController.text;
if(inputText.length>3){
keyBoardType = TextInputType.number;
}
}
),
It would be better if you use some regex to check your inputformat into the inputFormatters in your textformfield. if you don't know about inputformatters just google it.
I need to know how to hide the hint text when I focus on the text field. This is my code:
class _ContactoState extends State<Contacto> {
FocusNode focusMsj;
#override
void initState() {
super.initState();
focusMsj = FocusNode();
focusMsj.addListener(() {
if (!focusMsj.hasFocus) {
FocusScope.of(context).requestFocus(focusMsj);
}
});
}
TextField(
focusNode: focusMsj,
hintText: focusMsj.hasFocus ? ' ' : 'Hint Text',)
return WillPopScope(
child: Listener(
onPointerUp: (e) {
focusMsj.hasFocus ? FocusScope.of(context).requestFocus(FocusNode()): '';
},
Thank you
For doing that matter you need to make something like that
class Play extends StatefulWidget {
#override
_PlayState createState() => _PlayState();
}
class _PlayState extends State<Play> {
FocusNode focusNode = FocusNode();
String hintText = 'Hello , iam Hint';
#override
void initState() {
// TODO: implement initState
super.initState();
focusNode.addListener(() {
if (focusNode.hasFocus) {
hintText = '';
} else {
hintText = 'Hello , iam Hint';
}
setState(() {});
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(onPressed: () {
print(focusNode.hasFocus);
}),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextField(
focusNode: focusNode,
decoration: InputDecoration(
hintText: hintText,
),
),
TextField(
decoration: InputDecoration(
hintText: '!!',
),
),
],
),
),
);
}
}
Shortly i listened to TextField by its focusNode property . When TextField has focus i make hintText property equal empty String value
There is a property for that:
TextField(decoration: InputDecoration(hasFloatingPlaceholder: false));
Edit: The version above is deprecated, the new version is:
TextField(decoration: InputDecoration(floatingLabelBehavior: FloatingLabelBehavior.never,),),
One simple solution you can try is define labelText with FloatingBehavior.never
TextField(
decoration: InputDecoration(
labelText: "Search",
floatingLabelBehavior: FloatingLabelBehavior.never,
)
)
HintText will be shown when it is not focussed. On focus, hint text will disappear.
Simply, don't add the hintText in the InputDecoration and mention only the labelText: 'Label' alongside labelStyle if you want to change the style of the label.
TextField(
decoration: InputDecoration(
labelText: "Label",
labelStyle: TextStyle(
color: Colors.blueGrey,
),
floatingLabelBehavior: FloatingLabelBehavior.never,
)
)
My understanding is there is no way to implement it without custom code. Hiding hintText when focused with "border: InputBorder.none," gives perfect login widget example as FloatingLabelBehavior and having animated labelText just won't do. floatingLabelBehavior: FloatingLabelBehavior.never - helps in some situtations but not the exact thing we wanted. If you have labelText and hintText FloatingLabelBehavior.never is helpful to control hiding and showing hintText and animating labelText above the field. WIth custom code we have
String emailHintText = "E-mail";
on the top of state class. Then:
Container(
decoration: BoxDecoration(
border: Border.all(color: white),
borderRadius: BorderRadius.circular(5)),
child: Padding(
padding: EdgeInsets.all(10),
child:
Focus(
onFocusChange: (hasFocus) {
if (hasFocus) {
setState(() {});
emailHintText = "";
}
else {
setState(() {});
emailHintText = "E-mail";
}
},
child: TextFormField(
decoration: InputDecoration(
hintText: emailHintText,
border: InputBorder.none))));
Now, you should know that using setState is a bit costly operation and may not be the best option if not used for very important functionalities.
This works perfectly for me. Just add on InputDecoration ( floatingLabelBehavior: FloatingLabelBehavior.never) of TextField or TextFormField.
TextFormField( controller:_controller, decoration : InputDecoration( label: Text('Entrer your code here '), floatingLabelBehavior: FloatingLabelBehavior.never, ), );
I'm unable to find a way to create an input field in Flutter that would open up a numeric keyboard and should take numeric input only. 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.
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
),
],
)),
);
}
}
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>[
// for below version 2 use this
FilteringTextInputFormatter.allow(RegExp(r'[0-9]')),
// for version 2 and greater youcan also use this
FilteringTextInputFormatter.digitsOnly
],
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)
)
)
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
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
...
https://docs.flutter.io/flutter/material/TextFormField/TextFormField.html
https://docs.flutter.io/flutter/services/TextInputType-class.html
To avoid paste not digit value, add after
keyboardType: TextInputType.number
this code :
inputFormatters: [FilteringTextInputFormatter.digitsOnly]
from https://api.flutter.dev/flutter/services/FilteringTextInputFormatter-class.html
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.
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';
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"),
],
)),
);
}
}
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
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.
Number type only
keyboardType: TextInputType.number
And more option with number pad
keyboardType: TextInputType.numberWithOptions(decimal: true,signed: false)
Just add this to your TextFormField
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.allow(RegExp(r'[0-9]')), ],
Example,
TextFormField(
controller: textController,
onChanged: (value) {
print(value);
},
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.allow(RegExp(r'[0-9]')),
],
),
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;
},
),
You can try this:
TextFormField(
keyboardType: TextInputType.number,
decoration: InputDecoration(
prefixIcon: Text("Enter your number: ")
),
initialValue: "5",
onSaved: (input) => _value = num.tryParse(input),
),
For number input or numeric keyboard you can use keyboardType: TextInputType.number
TextFormField(
decoration: InputDecoration(labelText:'Amount'),
controller: TextEditingController(
),
validator: (value) {
if (value.isEmpty) {
return 'Enter Amount';
}
},
keyboardType: TextInputType.number
)
You can add input format with keyboard type, like this
TextField(
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.digitsOnly
],// Only numbers can be entered
keyboardType: TextInputType.number,
);
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)
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;
}
Set your keyboardType to TextInputType.number,
Eg: keyboardType: TextInputType.number,
TextFormField(
controller: yourcontroller,
keyboardType: TextInputType.number,
decoration: const InputDecoration(
labelText: 'Mobile',
suffixIcon: Padding(
padding: EdgeInsets.only(),
child:
Icon(Icons.phone_outlined, color: Color(0xffff4876)),
),
),
validator: (text) {
if (text == null || text.isEmpty) {
return 'Please enter your Mobile No.';
}
return null;
},
),
I need en IntegerFormField with a controll of min/max. And the big problem is that OnEditingComlete is not called when the focus changes. Here is my solution:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:vs_dart/vs_dart.dart';
class IntegerFormField extends StatefulWidget {
final int value, min, max;
final InputDecoration decoration;
final ValueChanged<TextEditingController> onEditingComplete;
IntegerFormField({#required this.value, InputDecoration decoration, onEditingComplete, int min, int max})
: min = min ?? 0,
max = max ?? maxIntValue,
onEditingComplete = onEditingComplete ?? ((_) {}),
decoration = decoration ?? InputDecoration()
;
#override
_State createState() => _State();
}
class _State extends State<IntegerFormField> {
final TextEditingController controller = TextEditingController();
#override
void initState() {
super.initState();
controller.text = widget.value.toString();
}
#override
void dispose() {
super.dispose();
}
void onEditingComplete() {
{
try {
if (int.parse(controller.text) < widget.min)
controller.text = widget.min.toString();
else if (int.parse(controller.text) > widget.max)
controller.text = widget.max.toString();
else
FocusScope.of(context).unfocus();
} catch (e) {
controller.text = widget.value.toString();
}
widget.onEditingComplete(controller);
}
}
#override
Widget build(BuildContext context) {
return Focus(
child: TextFormField(
controller: controller,
inputFormatters: [FilteringTextInputFormatter.digitsOnly],
keyboardType: TextInputType.number,
decoration: widget.decoration,
),
onFocusChange: (value) {
if (value)
controller.selection = TextSelection(baseOffset: 0, extentOffset: controller.value.text.length);
else
onEditingComplete();
},
);
}
}
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();
}
}
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,
),
);
Here is code for actual Phone keyboard in Flutter:
//Mobile
const TextField(
keyboardType: TextInputType.number,
decoration: InputDecoration(
prefixIcon: Icon(Icons.phone), hintText: 'Mobile'),
),
Here are all details on how to add numeric keybord, How to do validations, How to add stylings, and other stuff in dart/flutter.
I hope it can help you to learn in a better way.
Padding(
padding: const EdgeInsets.all(3.0),
child: TextFormField(
maxLength: 10,
keyboardType: TextInputType.number,
validator: (value) {
if (value.isEmpty) {
return 'Enter Number Please';
}
return null;
},
decoration: InputDecoration(
prefixIcon: Icon(Icons.smartphone),
prefixText: '+92',
labelText: 'Enter Phone Number',
contentPadding: EdgeInsets.zero,
enabledBorder: OutlineInputBorder(),
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(
width: 2, color: Theme
.of(context)
.primaryColor,
)
),
focusColor: Theme
.of(context)
.primaryColor,
),
),
),
TextField(
controller: _controller,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.allow(RegExp(r'[0.0-9.9]')),
])
You need to add the line
keyboardType: TextInputType.phone,
Within the block "TextFormField". Example below:
TextField(
controller: _controller,
keyboardType: TextInputType.phone,
),
It should look like this: