Question 32815 in React native Question posted in
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Why is the new value not set when I exit the page? – React native

I simplified the problem I had in my application as follows. Even if I enter a new word in the TextInput, when I go back in the page it says "initial". Why doesn’t it write new value?

Actually, what I want to do here is to send the last entered text to redux as soon as I press the phone’s back button(hardwareBackPress). But it always sends the initial value. How can I solve this problem?

import { TextInput } from 'react-native'
import React, { useEffect, useState } from 'react'

export default function ChangeModel({ navigation }) {
    const [text, setText] = useState("initial")
  
    const onPressSave = () => {
        console.log(text)
    }

    useEffect(() => {
        return () => onPressSave()
    }, [])


    return (
        <TextInput
            value={text}
            onChangeText={setText}
            style={{ backgroundColor: "grey" }}
        />
    )
}
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2

Answers


  1. 0

    you’re not set anything that makes the value change, try to set the state with new value:

    setText(newValue)

    if you handle with redux you should import the action first and dispatch it after that

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  2. 0

    To get entered data you have to write a button component like this

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

export default function ChangeModel({ navigation }) {
const [text, setText] = useState('initial');

const onPressSave = () => {
 console.log(text);
};

useEffect(() => {
 return () => onPressSave();
}, []);

return (
 <View>
   <TextInput value={text} onChangeText={setText} />
   <Button title="Press me" onPress={onPressSave} />
 </View>
 );
 }

    When you click the button on the back of the phone, the state is default

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