Formatters for Text and Input Fields with Flutter

A set of formatters for text and input fields. Not only it can format a phone number but also automatically detect a country dial code and the name of the country. It also can apply formatting for currencies e.g. you need to convert 100000 into a USD currency value representation. Add MoneyInputFormatter and you can get it e.g. like: $100,000.00…

Formatters Included

  1. Phone Formatter
  2. Credit / Debit Card Formatter
  3. Money Formatter
  4. Masked Formatter

Special utilities

  1. Bitcoin (BTC) wallet validator;
  2. Digit exctractor (allows to extract all digits out of a string)
  3. Phone number validator (the check is based on country phone codes and masks so it's a more serious and reliable validation than a simple regular expression)
  4. "Is digit" checker (Simply checks if an input string value a digit or not)
  5. Currency string formatter (allows to convert a number to a currency string representation e.g. this 10000 to this 10,000.00$)
  6. Unfocuser (a widget that is used to unfocus any text fields without any boilerplate code. Extremely simple to use)

Formatting a phone

    countryCode: 'RU',
    newMask: '+0 (000) 000 00 00',
    countryCode: 'BR',
    alternativeMasks: [
    '+00 (00) 0000-0000',
    '+(00) 00000',
    '+00 (00) 00-0000',
/// There is also a possibility to enter endless phones 
/// by setting allowEndlessPhone to true 
/// this means that you can enter a phone number of any length
/// its part that matches a mask will be formatted 
/// and the rest will be entered unformatted
/// is will allow you to support any phones (even those that are not supported by the formatter yet)
    onCountrySelected: _onCountrySelected,
    allowEndlessPhone: true,

Formatting a credit / debit card

Formatting currencies


import 'package:flutter_multi_formatter/flutter_multi_formatter.dart';

A list of formatters included

/// for phone numbers with a fully automated detection

/// for anything that can be masked

/// for credit / debit cards

/// for any inputs where you need to restrict or
/// allow some characters

/// for currencies

Utility methods and widgets

Validates Bitcoin wallets (also supports bech32)

You can use these example wallets to test the validator

P2PKH addresses start with the number 1 Example: 1BvBMSEYstWetqTFn5Au4m4GFg7xJaNVN2

P2SH addresses start with the number 3 Example: 3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy

Bech32 addresses also known as "bc1 addresses" start with bc1 Example: bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq

/// a simple check if its a BTC wallet or not, regardless of its type
bool isBitcoinWalletValid(String value);

/// a bit more complicated check which can return the type of 
/// BTC wallet and return SegWit (Bech32), Regular, or None if 
/// the string is not a BTC address
BitcoinWalletType getBitcoinWalletType(String value);

/// Detailed check, for those who need to get more details 
/// of the wallet. Returns the address type, the network, and 
/// the wallet type along with its address. 
/// It always returns BitcoinWalletDetails object. To check if it's
/// valid or not use bitcoinWalletDetails.isValid getter
/// IMPORTANT The BitcoinWalletDetails class overrides an 
/// equality operators so two BitcoinWalletDetails objects can be 
/// compared simply like this bwd1 == bwd2
BitcoinWalletDetails getBitcoinWalletDetails(String? value);

Gets all numbers out of a string and joins them into a new string e.g. a string like fGgfjh456bb78 will be converted into this: 45678

import 'package:flutter_multi_formatter/flutter_multi_formatter.dart';

String toNumericString(String text);

returns 'true' if the checked character is a digit

import 'package:flutter_multi_formatter/flutter_multi_formatter.dart';

bool isDigit(String character);

toCurrencyString() is used by the MoneyInputFormatter internally but you can also use it directly

import 'package:flutter_multi_formatter/flutter_multi_formatter.dart';

String toCurrencyString(String value, {
    int mantissaLength = 2,
    /// in case you need a period as a thousand separator
    /// simply change ThousandSeparator.Comma to ThousandSeparator.Period
    /// and you will get 1.000.000,00 instead of 1,000,000.00
    ThousandSeparator thousandSeparator = ThousandSeparator.Comma,
    ShorteningPolicy shorteningPolicy = ShorteningPolicy.NoShortening,
    String leadingSymbol = '',
    String trailingSymbol = '',
    bool useSymbolPadding = false

print(toCurrencyString('123456', leadingSymbol: MoneySymbols.DOLLAR_SIGN)); // $123,456.00

/// the values can also be shortened to thousands, millions, billions... 
/// in this case a 1000 will be displayed as 1K, and 1250000 will turn to this 1.25M
var result = toCurrencyString(
    leadingSymbol: MoneySymbols.DOLLAR_SIGN,
    shorteningPolicy: ShorteningPolicy.RoundToThousands
); // $125K

result = toCurrencyString(
    leadingSymbol: MoneySymbols.DOLLAR_SIGN,
    shorteningPolicy: ShorteningPolicy.RoundToMillions
); // 1.25M

There's also an "extension" version of this function which can be used on double, int and String.

import 'package:flutter_multi_formatter/flutter_multi_formatter.dart';

var someNumericValue = 123456;
print(someNumericValue.toCurrencyString(leadingSymbol: MoneySymbols.DOLLAR_SIGN)); // $123,456.00

var someNumericStringValue = '123456';
print(someNumericStringValue.toCurrencyString(trailingSymbol: MoneySymbols.EURO_SIGN)); // 123,456.00€

Unfocuser allows you to unfocus any text input and hide the onscreen keyboard when you tap outside of a text input. Use it like this:

Widget build(BuildContext context) {
return Unfocuser(
    child: Scaffold(
    body: SingleChildScrollView(
        child: Padding(
        padding: const EdgeInsets.all(30.0),
        child: Form(
            key: _formKey,
            child: Column(
            children: <Widget>[
                inputFormatters: [

More detailed description


Automatically detects the country the phone number belongs to and formats the number according to its mask. You don't have to care about keeping track of the list of countries or anything else. The whole process is completely automated. You simply add this formatter to the list of formatters like this:

    inputFormatters: [

You can also get a country data for the selected phone number by simply passing a callback function to your formatter.

    inputFormatters: [
        PhoneInputFormatter(onCountrySelected:  (PhoneCountryData countryData) {

CreditCardNumberInputFormatter automatically detects a type of a card based on a predefined list of card system and formats the number accordingly. This detection is pretty rough and may not work with many card system. All supported systems are available as string constants in

class CardSystem {
  static const String VISA = 'Visa';
  static const String MASTERCARD = 'Mastercard';
  static const String JCB = 'JCB';
  static const String DISCOVER = 'Discover';
  static const String MAESTRO = 'Maestro';
  static const String AMERICAN_EXPRESS= 'Amex';

Anyway, if the number is not supported it will just be returned as it is and your input will not break because of that

    keyboardType: TextInputType.number,
    inputFormatters: [
        CreditCardNumberInputFormatter(onCardSystemSelected:  (CardSystemData cardSystemData) {

/// there's also a method to format a number as a card number
/// the method is located in a credit_card_number_input_formatter.dart file
String formatAsCardNumber(
String cardNumber, {
    bool useSeparators = true,

/// and a method to check is a card is valid
bool isCardValidNumber(String cardNumber);
/// but it will return true only if the card system is supported, 
/// so you should not really rely on that

Masked formatter


This formatter allows you to easily format a text by a mask This formatter processes current text selection very carefully so that input does not feel unnatural Use it like any other formatters

/// # matches any character and 0 matches digits
/// so, in order to format a string like this GHJ45GHJHN to GHJ-45-GHJHN
/// use a mask like this
    inputFormatters: [

But in case you want # (hash symbol) to match only some particular values, you can pass a regular expression to [anyCharMatcher] parameter

/// in this scenario, the # symbol will only match uppercase latin letters
    inputFormatters: [
        MaskedInputFormater('###-00-#####', anyCharMatcher: RegExp(r'[A-Z]'))

Money Input formatter

    keyboardType: TextInputType.number,
    inputFormatters: [
            leadingSymbol: MoneySymbols.DOLLAR_SIGN

    keyboardType: TextInputType.number,
    inputFormatters: [
            trailingSymbol: MoneySymbols.EURO_SIGN,
            useSymbolPadding: true,
            mantissaLength: 3 // the length of the fractional side

For more details see example project. And feel free to open an issue if you find any bugs of errors

What is GEEK

Buddha Community

Formatters for Text and Input Fields with Flutter

Google's Flutter 1.20 stable announced with new features - Navoki

Flutter Google cross-platform UI framework has released a new version 1.20 stable.

Flutter is Google’s UI framework to make apps for Android, iOS, Web, Windows, Mac, Linux, and Fuchsia OS. Since the last 2 years, the flutter Framework has already achieved popularity among mobile developers to develop Android and iOS apps. In the last few releases, Flutter also added the support of making web applications and desktop applications.

Last month they introduced the support of the Linux desktop app that can be distributed through Canonical Snap Store(Snapcraft), this enables the developers to publish there Linux desktop app for their users and publish on Snap Store.  If you want to learn how to Publish Flutter Desktop app in Snap Store that here is the tutorial.

Flutter 1.20 Framework is built on Google’s made Dart programming language that is a cross-platform language providing native performance, new UI widgets, and other more features for the developer usage.

Here are the few key points of this release:

Performance improvements for Flutter and Dart

In this release, they have got multiple performance improvements in the Dart language itself. A new improvement is to reduce the app size in the release versions of the app. Another performance improvement is to reduce junk in the display of app animation by using the warm-up phase.


If your app is junk information during the first run then the Skia Shading Language shader provides for pre-compilation as part of your app’s build. This can speed it up by more than 2x.

Added a better support of mouse cursors for web and desktop flutter app,. Now many widgets will show cursor on top of them or you can specify the type of supported cursor you want.

Autofill for mobile text fields

Autofill was already supported in native applications now its been added to the Flutter SDK. Now prefilled information stored by your OS can be used for autofill in the application. This feature will be available soon on the flutter web.


A new widget for interaction

InteractiveViewer is a new widget design for common interactions in your app like pan, zoom drag and drop for resizing the widget. Informations on this you can check more on this API documentation where you can try this widget on the DartPad. In this release, drag-drop has more features added like you can know precisely where the drop happened and get the position.

Updated Material Slider, RangeSlider, TimePicker, and DatePicker

In this new release, there are many pre-existing widgets that were updated to match the latest material guidelines, these updates include better interaction with Slider and RangeSliderDatePicker with support for date range and time picker with the new style.


New pubspec.yaml format

Other than these widget updates there is some update within the project also like in pubspec.yaml file format. If you are a flutter plugin publisher then your old pubspec.yaml  is no longer supported to publish a plugin as the older format does not specify for which platform plugin you are making. All existing plugin will continue to work with flutter apps but you should make a plugin update as soon as possible.

Preview of embedded Dart DevTools in Visual Studio Code

Visual Studio code flutter extension got an update in this release. You get a preview of new features where you can analyze that Dev tools in your coding workspace. Enable this feature in your vs code by _dart.previewEmbeddedDevTools_setting. Dart DevTools menu you can choose your favorite page embed on your code workspace.

Network tracking

The updated the Dev tools comes with the network page that enables network profiling. You can track the timings and other information like status and content type of your** network calls** within your app. You can also monitor gRPC traffic.

Generate type-safe platform channels for platform interop

Pigeon is a command-line tool that will generate types of safe platform channels without adding additional dependencies. With this instead of manually matching method strings on platform channel and serializing arguments, you can invoke native class and pass nonprimitive data objects by directly calling the Dartmethod.

There is still a long list of updates in the new version of Flutter 1.2 that we cannot cover in this blog. You can get more details you can visit the official site to know more. Also, you can subscribe to the Navoki newsletter to get updates on these features and upcoming new updates and lessons. In upcoming new versions, we might see more new features and improvements.

You can get more free Flutter tutorials you can follow these courses:

#dart #developers #flutter #app developed #dart devtools in visual studio code #firebase local emulator suite in flutter #flutter autofill #flutter date picker #flutter desktop linux app build and publish on snapcraft store #flutter pigeon #flutter range slider #flutter slider #flutter time picker #flutter tutorial #flutter widget #google flutter #linux #navoki #pubspec format #setup flutter desktop on windows

Terry  Tremblay

Terry Tremblay


What is Flutter and why you should learn it?

Flutter is an open-source UI toolkit for mobile developers, so they can use it to build native-looking** Android and iOS** applications from the same code base for both platforms. Flutter is also working to make Flutter apps for Web, PWA (progressive Web-App) and Desktop platform (Windows,macOS,Linux).


Flutter was officially released in December 2018. Since then, it has gone a much stronger flutter community.

There has been much increase in flutter developers, flutter packages, youtube tutorials, blogs, flutter examples apps, official and private events, and more. Flutter is now on top software repos based and trending on GitHub.

Flutter meaning?

What is Flutter? this question comes to many new developer’s mind.


Flutter means flying wings quickly, and lightly but obviously, this doesn’t apply in our SDK.

So Flutter was one of the companies that were acquired by **Google **for around $40 million. That company was based on providing gesture detection and recognition from a standard webcam. But later when the Flutter was going to release in alpha version for developer it’s name was Sky, but since Google already owned Flutter name, so they rename it to Flutter.

Where Flutter is used?

Flutter is used in many startup companies nowadays, and even some MNCs are also adopting Flutter as a mobile development framework. Many top famous companies are using their apps in Flutter. Some of them here are





Reflectly app

Reflectly app

Abbey Road Studios

Abbey Road Studios

and many more other apps. Mobile development companies also adopted Flutter as a service for their clients. Even I was one of them who developed flutter apps as a freelancer and later as an IT company for mobile apps.

Flutter as a service

#dart #flutter #uncategorized #flutter framework #flutter jobs #flutter language #flutter meaning #flutter meaning in hindi #google flutter #how does flutter work #what is flutter

I am Developer


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add/remove multiple input fields dynamically with jquery laravel

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What we will do?
I will make a simple design of a dialogue box with a card design with text over it as shown below. After you complete this exercise you can experiment with the UI. You can make your own components or import UI kits available with the Adobe XD.

#developers #flutter #adobe xd design export to flutter #adobe xd flutter code #adobe xd flutter code generator - plugin #adobe xd flutter plugin #adobe xd flutter plugin tutorial #adobe xd plugins #adobe xd to flutter #adobe xd tutorial #codepen for flutter.

Elliott  Owen

Elliott Owen


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#statefulwidget #ripplescode #flutter #flutter stateful widget #text field #exploring flutter widgets