Why form handling captures user data in React Native

Introduction

Form handling lets apps collect information users type in. This helps apps know what users want or need.

When a user signs up or logs in to an app.

When a user fills out a survey or feedback form.

When a user enters shipping or payment details in a shopping app.

When a user updates their profile information.

When a user searches for something using a search box.

Syntax

React Native

const [value, setValue] = useState('');

<TextInput
  value={value}
  onChangeText={text => setValue(text)}
  placeholder="Type here"
/>

Use to create a form field in React Native.

Use useState to keep track of what the user types.

Examples

This example captures a user's name as they type.

React Native

const [name, setName] = useState('');

<TextInput
  value={name}
  onChangeText={text => setName(text)}
  placeholder="Enter your name"
/>

This example captures an email address and shows a keyboard suited for emails.

React Native

const [email, setEmail] = useState('');

<TextInput
  value={email}
  onChangeText={text => setEmail(text)}
  placeholder="Enter your email"
  keyboardType="email-address"
/>

Sample App

This app shows a text input where the user types their favorite color. The typed text appears below in real time.

React Native

import React, { useState } from 'react';
import { View, TextInput, Text, StyleSheet } from 'react-native';

export default function App() {
  const [input, setInput] = useState('');

  return (
    <View style={styles.container}>
      <Text style={styles.label}>Enter your favorite color:</Text>
      <TextInput
        style={styles.input}
        value={input}
        onChangeText={text => setInput(text)}
        placeholder="Type color here"
        accessibilityLabel="Favorite color input"
      />
      <Text style={styles.output}>You typed: {input}</Text>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    padding: 20,
    backgroundColor: '#fff'
  },
  label: {
    fontSize: 18,
    marginBottom: 10
  },
  input: {
    borderWidth: 1,
    borderColor: '#888',
    padding: 10,
    fontSize: 16,
    borderRadius: 5
  },
  output: {
    marginTop: 20,
    fontSize: 18,
    color: '#333'
  }
});

Important Notes

Always keep the input value in state to capture user data.

Use accessibilityLabel for screen readers to help users with disabilities.

Update the UI to show what the user typed for better feedback.

Summary

Form handling captures what users type so apps can use that data.

Use state and TextInput in React Native to handle forms.

Show typed data back to users for clear interaction.