A clean, centered input field for entering amounts is a small but significant part of any financial app. It enhances user experience, provides clarity, and ensures ease of use. In this article, we’ll walk through creating a reusable CurrencySection component in React Native.
This component is simple yet powerful, featuring:
- Dynamic height adjustment for the input field.
- Automatic formatting for amounts in a specified currency.
- Inline error messaging for better user feedback.
Let’s dive into the details!
What the CurrencySection Does
The CurrencySection component is designed to:
- Allow users to input amounts in a visually appealing, centered format.
- Automatically format amounts into the specified currency.
- Provide flexibility to customize elements such as the currency symbol, placeholder text, and error messages.
Implementation
Here’s the full implementation of the CurrencySection component:
/* eslint-disable react-native/no-inline-styles */ import React, {useCallback, useState} from 'react'; import { Keyboard, NativeSyntheticEvent, Platform, StyleSheet, TextInput, TextInputContentSizeChangeEventData, TextInputProps, View, } from 'react-native'; import { formatAmountInCurrency, MAX_AMOUNT_LENGTH_CURRENCY_SECTION, trimNumber, } from '../../utils/functions'; import colors from '../../utils/helpers/colors'; import {InlineError} from '../../utils/helpers/Reusables'; import AppText from '../texts/appText'; interface CurrencySectionProps extends TextInputProps { title?: string; amount?: string; error?: string; onChangeAmount?: (amount: string) => void; isEditable?: boolean; currency?: string; } const CurrencySection: React.FC<currencysectionprops> = ({ title = 'Enter amount', amount = '', error = '', onChangeAmount, isEditable = true, currency = '₦', ...props }) => { const [height, setHeight] = useState(42); const onChangeText = useCallback( (text: string) => { onChangeAmount?.(trimNumber(text)); }, [onChangeAmount], ); const onBlur = useCallback(() => { if (amount) { const formattedAmount = formatAmountInCurrency( Number(amount.replaceAll(',', '')), ).replaceAll(',', ''); onChangeAmount?.(formattedAmount); } }, [amount, onChangeAmount]); const handleContentSizeChange = useCallback( (e: NativeSyntheticEvent<textinputcontentsizechangeeventdata>) => { setHeight(e.nativeEvent.contentSize.height); }, [], ); return ( <view> <hr> <p><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173624596347120.jpg?x-oss-process=image/resize,p_40" class="lazy" alt="How to Build a Centered Input Field for Amounts in React Native"></p> <h3> Highlights of the CurrencySection Component </h3> <ol> <li><p><strong>Dynamic Height Adjustment</strong><br><br> The input field dynamically resizes to match its content size, ensuring a clean and adaptive design. </p></li> <li><p><strong>Automatic Currency Formatting</strong><br><br> The formatAmountInCurrency function ensures amounts are formatted appropriately, making them easier to read. </p></li> <li><p><strong>Customizable and Reusable</strong><br><br> With props for titles, currency symbols, and error messages, this component is flexible enough for various use cases. </p></li> <li><p><strong>Error Feedback</strong><br><br> Inline error messages provide immediate feedback without disrupting the flow of the UI. </p></li> </ol> <hr> <h3> Styling Choices </h3> <ul> <li> <strong>Alignment</strong>: Centering the input and currency symbol creates a clean, balanced layout. </li> <li> <strong>Font Size and Weight</strong>: The bold and large font for the currency and input fields ensures they stand out. </li> <li> <strong>Colors</strong>: Neutral placeholder colors and transparent backgrounds maintain focus on the content. </li> </ul> <hr> <h3> Conclusion </h3> <p>This CurrencySection component is a simple yet effective addition to any financial app. It’s designed to handle core input requirements while keeping the UI visually appealing and functional. </p> <p>Give it a try, customize it to suit your app’s style, and let your users enjoy a seamless experience! </p> <p><em>Feel free to share your thoughts or questions in the comments.</em></p> </view></textinputcontentsizechangeeventdata></currencysectionprops>
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