Halil Bilir

Posted on Feb 3, 2021

React Native Animated Credit Card Library

#reactnative #typescript #react #javascript

I built a new library upon the tutorials I posted about React Native forms, and published it on Github.

I won't go into the implementation details this time. You can check out the source code and let me know about any questions you might have.

Features

Works on iOS and Android.
Validations.
Card icon animation with Lottie.
Card flip animation with react-native-card-flip.
Possible to access all react-hook-form methods.
TypeScript code base.
Works on Expo.

Installation

Install the library first:

npm install rn-credit-card
// OR
yarn add rn-credit-card

Install react-hook-form:

npm install react-hook-form
// OR
yarn add react-hook-form

You also need to install lottie-react-native if you want to display card icon animations. Please note that this is optional, and the library will display simple card icons if Lottie is not present:

npm install lottie-react-native
// OR
yarn add lottie-react-native

If you'd like to use the library on Android, make sure you're using a lottie-react-native version greater than 3.0.0. The animations are not working on 2.x.x versions.

Additional steps might be needed depending on your platform. Please check lottie-react-native documentation.

Configuring Fonts

The library uses Roboto Mono font by default. If you'd like to keep it that way, you need to import RobotoMono_400Regular and RobotoMono_700Bold fonts to your project. Please see Expo or this dev.to post for more information.

You may also use custom fonts with this library. Please see #fonts section.

Usage

You need to create a react-hook-form and pass it down to the CreditCardForm through FormProvider context. This structure helps you accessing every propery and method of the form so you can build some features on top of the library.

The library is written in TypeScript, and types are also available out of the box. You may use FormModel to type your form.

Here is a fully functional example with KeyboardAvodingView, which manages the scroll position when keyboard is open.

import React from 'react'
import { FormProvider, useForm } from 'react-hook-form'
import {
  Alert,
  StyleSheet,
  KeyboardAvoidingView,
  Platform,
  SafeAreaView,
} from 'react-native'
import LottieView from 'lottie-react-native'
import CreditCardForm, { Button, FormModel } from 'rn-credit-card'

const App: React.FC = () => {
  const formMethods = useForm<FormModel>({
    // to trigger the validation on the blur event
    mode: 'onBlur',
    defaultValues: {
      holderName: '',
      cardNumber: '',
      expiration: '',
      cvv: '',
    },
  })
  const { handleSubmit, formState } = formMethods

  function onSubmit(model: FormModel) {
    Alert.alert('Success: ' + JSON.stringify(model, null, 2))
  }

  return (
    <FormProvider {...formMethods}>
      <SafeAreaView style={styles.container}>
        <KeyboardAvoidingView
          style={styles.avoider}
          behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
        >
          <CreditCardForm
            LottieView={LottieView}
            horizontalStart
            overrides={{
              labelText: {
                marginTop: 16,
              },
            }}
          />
        </KeyboardAvoidingView>
        {formState.isValid && (
          <Button
            style={styles.button}
            title={'CONFIRM PAYMENT'}
            onPress={handleSubmit(onSubmit)}
          />
        )}
      </SafeAreaView>
    </FormProvider>
  )
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  avoider: {
    flex: 1,
    padding: 36,
  },
  button: {
    margin: 36,
    marginTop: 0,
  },
})

export default App

If you are not using TypeScipt on your project, simply remove FormModel references from the example above.

Available Props

LottieView

This prop takes the default exported value of lottie-react-native library. This is optional because Lottie might require additional configuration steps. The library will display simple png card icons if this prop is not provided.

Please remember you need a lottie-react-native version greater than 3.x.x to make it work on Android.

type	default	required	platform
any	undefined	NO	iOS/Android

Example:

import LottieView from 'lottie-react-native'
<CreditCardForm LottieView={LottieView} />

horizontalStart

This makes the form start with a horizontal scroll. This is the default behaviour.

This feature is not working on Android due to a weird problem happening when the ScrollView is switched from horizontal.

type	default	required	platform
boolean	true	NO	iOS only

This is the outcome when horizontalStart is false:

backgroundImage

You may use this prop to replace the background image of the card preview.

type	default	required	platform
React.ReactNode	undefined	NO	iOS/Android

Example:

<CreditCardForm
  backgroundImage={
    <Image
      style={{
        position: 'absolute',
        width: '100%',
        height: '100%',
        borderRadius: 12,
      }}
      source={background}
    />
  }
/>

fonts

fonts props take an object with two fields:

field	type	default	required
fonts.regular	string	RobotoMono_400Regular	NO
fonts.bold	string	RobotoMono_700Bold	NO

Please note that you should use a Monospaced font for the best user experience. The fixed width helps maintaining the same card number width while the user types.

Example:

<CreditCardForm
  fonts={{
    regular: 'RobotoMono_400Regular',
    bold: 'RobotoMono_700Bold',
  }}
/>

inputColors

You may modify the TextInput colors using this. It's an object with three optional fields:

field	type	default	required
focused	string	#080F9C	NO
errored	string	#B00020	NO
regular	string	#B9C4CA	NO

Example:

<CreditCardForm
  inputColors={{
    focused: '#080F9C',
    errored: '#B00020',
    regular: '#B9C4CA',
  }}
/>

translations

An optional object that takes a string for each displayed text on the library. You may use it to modify any or all of those displayed texts.

type	default	required	platform
Translations	undefined	NO	iOS/Android

Example:

<CreditCardForm
  // those are the default values
  translations={{
    cardNumber: 'Card Number',
    cardHolderName: 'Cardholder Name',
    nameSurname: 'Name Surname',
    mmYY: 'MM/YY',
    expiration: 'Expiration',
    securityCode: 'Security Code',
    next: 'Next',
    done: 'Done',
    cardNumberRequired: 'Card number is required.',
    cardNumberInvalid: 'This card number looks invalid.',
    cardHolderNameRequired: 'Cardholder name is required.',
    cardHolderNameInvalid: 'This cardholder name looks invalid.',
    expirationRequired: 'Expiration date is required.',
    expirationInvalid: 'This expiration date looks invalid.',
    securityCodeRequired: 'Security code is required.',
    securityCodeInvalid: 'This security date looks invalid.',
  }}
/>

overrides

This props might be used to override some component styles within the library. All fields are optional.

field	type
cardPreview	ViewStyle or TextStyle
labelText	TextStyle
cardHolderPreview	TextStyle
expirationPreview	ViewStyle or TextStyle
outline	ViewStyle
input	ViewStyle
labelContainer	ViewStyle
inputLabel	TextStyle
errorText	TextStyle

Top comments (6)

SayonaraSam • Feb 3 '22

Amazing job! I love what you have done from the side of a developer and designer because I am working in a financial service and I know how important it is to create something that will be easy to use for users and will help them to get what they want. For example, on a website that I am working Triceloans.com it will be useful to add something like this. Thanks again!