更新数组 javascript 索引上的数据并做出本机反应

Question

In my Todo App i have sucessfully implemented the add and delete functions but the update function is having trouble. What i need it to do is when i click the touchable opacity of a Todo, it should appear in my inputbox and if any change is made then that todo should be updated eg clicking on abcd must make it appear in input box and changes made to it should be updated. Picture is also added below

export default function Todo() {
  const [getText, setText] = useState('');
  const [getList, setList] = useState([]);

  const addItem = () => {
       setList([...getList, {key: Math.random().toString(), data: getText}]);
       setText('');
    }

  const removeItem = (itemKey) => {  
    setList(() => getList.filter(item => item.key != itemKey));
  }

  const updateFieldChanged = (index) => e => {
    let newArr = [...getList]; // copying the old datas array
    newArr[index] = e.target.value; // replace e.target.value with whatever you want to change it to
    setList(newArr);
}

  return (
    <View style={styles.container}>
      <Text style={styles.title}>todo</Text>
      <View style={styles.inputContainer}>
        <TextInput
          style={styles.textInput}
          placeholder="Enter Item"
          onChangeText={text => setText(text)}
          value={getText}
        />
        <CustomButton     
          text = 'add'
          color='red'
          title= 'add'
          textSize={20}
          textColor="white"
          onPressEvent={addItem}

        />
      </View>

      <ScrollView style={styles.scrollview}>
        {getList.map((item, id) =>
          <TouchableOpacity
            key={item.key}
            activeOpacity={0.7}
            onPress= {() => updateFieldChanged(id)}


          >
            <View style={styles.scrollviewItem}>
              <Text style={styles.scrollviewText}>{id}) {item.data}</Text>
                <TouchableOpacity
                  onPress={() => removeItem(item.key)}
              >
                <View style={styles.crosstextcontainer}>
                  <Text style={styles.crosstext}>X</Text>
                </View>
              </TouchableOpacity>


            </View>
          </TouchableOpacity>
        )}
      </ScrollView>
    </View>
  );
}

Answer 1

Change

  <TouchableOpacity
            key={item.key}
            activeOpacity={0.7}
            onPress= {() => updateFieldChanged(id)}
          >

to

  <TouchableOpacity
              key={item.key}
              activeOpacity={0.7}
              onPress= {() => updateFieldChanged(id,getText)}
            >

Here iam passing the text that you need to enter to update a particular field

change your updateFieldChanged like this:

  const updateFieldChanged = (index, text) => {
      let newArr = [...getList]; // copying the old datas array
      newArr[index].data = text; // replace e.target.value with whatever you want to change it to
      setList(newArr);
      setText('');
  }

Here iam assigning the text you entered in the TextInput to the data object, which will update the array.

Hope this helps!