Issue with the onChangeText function in react-native TextInput

import React, {useRef, useState} from 'react';
import {KeyboardAvoidingView, Platform, ScrollView, TextInput} from 'react-native';
import {SafeAreaView} from "react-native-safe-area-context";

export const ProfileScreen: React.FC = () => {
    const [userInfo, setUserInfo] = useState({
        name: '',
        lastName: '',
    });
    const scrollViewRef = useRef<ScrollView>(null);
    const inputNameRef = useRef<TextInput>(null);
    const inputLastNameRef = useRef<TextInput>(null);
    
    ...
    return (
        <SafeAreaView style={{flex: 1}}>
            <KeyboardAvoidingView
                behavior={(Platform.OS === 'iOS') ? 'padding' : 'height'}
                style={{flex: 1}}>
                <ScrollView
                    keyboardShouldPersistTaps={'handled'}
                    ref={scrollViewRef}
                    showsHorizontalScrollIndicator={false}
                    showsVerticalScrollIndicator={false}>
                    <TextInput
                        ref={inputNameRef}
                        placeholder={'Your Name'}
                        onChangeText={(text) => {
                            setUserInfo((prevState) => ({...prevState, name: text}));
                        }}
                        value={userInfo.name}
                        onSubmitEditing={inputLastNameRef.current?.focus()}
                    />
                    <TextInput
                        ref={inputLastNameRef}
                        placeholder={'Your Last Name'}
                        onChangeText={(text) => {
                            setUserInfo((prevState) => ({...prevState, lastName: text}));
                        }}
                        value={userInfo.lastName}
                    />
                </ScrollView>
            </KeyboardAvoidingView>
        </SafeAreaView>
    );
};    

When I tap on the TextInput, the keyboard opens. However, when I press a key (triggering a state update), it closes. What could be causing this issue?

Tapping on the TextInput results in the keyboard opening as expected. However, pressing a key to trigger a state update unexpectedly closes the keyboard. How can this issue be resolved?

Answer №1

The problem arises due to a misconfiguration in the onSubmitEditing callback of your TextInput component. Instead of assigning the focus method as a callback to the event, you are directly calling it within the prop declaration. This causes the method to trigger immediately during rendering, leading to unwanted behavior where the keyboard closes unexpectedly.

To resolve this issue, make sure to wrap the focus method call within an arrow function. By doing so, the focus action will only occur when the onSubmitEditing event is triggered. Here's the corrected code snippet:

import React, {useRef, useState} from 'react';
import {KeyboardAvoidingView, Platform, ScrollView, TextInput} from 'react-native';
import {SafeAreaView} from "react-native-safe-area-context";

export const ProfileScreen: React.FC = () => {
    const [userInfo, setUserInfo] = useState({
        name: '',
        lastName: '',
    });
    const scrollViewRef = useRef<ScrollView>(null);
    const inputNameRef = useRef<TextInput>(null);
    const inputLastNameRef = useRef<TextInput>(null);
    
    return (
        <SafeAreaView style={{flex: 1}}>
            <KeyboardAvoidingView
                behavior={(Platform.OS === 'iOS') ? 'padding' : 'height'}
                style={{flex: 1}}>
                <ScrollView
                    keyboardShouldPersistTaps={'handled'}
                    ref={scrollViewRef}
                    showsHorizontalScrollIndicator={false}
                    showsVerticalScrollIndicator={false}>
                    <TextInput
                        ref={inputNameRef}
                        placeholder={'Your Name'}
                        onChangeText={(text) => {
                            setUserInfo((prevState) => ({...prevState, name: text}));
                        }}
                        value={userInfo.name}
                        onSubmitEditing={() => inputLastNameRef.current?.focus()} // Ensure to use arrow function here
                    />
                    <TextInput
                        ref={inputLastNameRef}
                        placeholder={'Your Last Name'}
                        onChangeText={(text) => {
                            setUserInfo((prevState) => ({...prevState, lastName: text}));
                        }}
                        value={userInfo.lastName}
                    />
                </ScrollView>
            </KeyboardAvoidingView>
        </SafeAreaView>
    );
};

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