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Filtering Object Of Array By Id - REACT

I'm having a big struggle with filtering an object of an array of objects by its ID in React. Let me explain:

The App is a Notes app, that stores every note you create with its Title, Text(name) and created date. The key is the ID.

Now I'm trying to create a popup modal every time I click on a note, which I managed to do ok, except for one thing: when the modal appears, it doesn't show only the selected note but all the notes list. I've tried with different array methods to filter the note I need, but didn't succeed.

This is the App.js file:

import React, { useState } from 'react';
import './App.css';
import Form from './components/Form';
import List from './components/List';
import { v4 as uuidv4 } from 'uuid';
import Modal from 'react-modal';
import ModalList from './components/ModalList';


Modal.setAppElement('#root');

function App() {
  /*HOOKS */

  const [list, setList] = useState([]);
  const [modalList, setModalList] = useState([]);


  //for modal:
  let subtitle;
  const [modalIsOpen, setIsOpen] = React.useState(false);




  /*FUNCTIONS */

  //add new notes
  function handleAdd(title, name) {
    if (name) {
      const newList = list.concat({ title: title, name: name, id: uuidv4(), date: getCurrentDate() });
      setList(newList);
      console.log(newList);
      const newModalList = list.concat({ title: title, name: name, id: uuidv4(), date: getCurrentDate() });
      setModalList(newModalList);
    }
    else { alert("You should complete the notes field") }

  }


  //get the date for adding the note
  function getCurrentDate() {

    let newDate = new Date()
    let date = newDate.getDate();
    let month = newDate.getMonth() + 1;
    let year = newDate.getFullYear();
    let hours = newDate.getHours();
    let minutes = newDate.getMinutes();

    return `${month < 10 ? `0${month}` : `${month}`}/${date}/${year}, ${hours}:${minutes < 10 ? `0${minutes}` : `${minutes}`} hs.`

  }


  //deleting a note
  function del(x) {
    if (window.confirm("Do you really want to delete this item? The action is permanent.")) {
      const newList = list.filter((item) => item.id !== x);
      setList(newList);
    }
  }



  //opening a modal
  function openModal() {

    setIsOpen(true);
  }

  //after opening a modal
  function afterOpenModal() {
    // references are now sync'd and can be accessed.
    subtitle.style.color = '#f00';

  }

  //closing a modal
  function closeModal() {
    setIsOpen(false);

  }


  /*APP */
  return (
    <>

      <div>
        {/* MODAL */}
        <Modal
          isOpen={modalIsOpen}
          onAfterOpen={afterOpenModal}
          onRequestClose={closeModal}
          style={customStyles}
          contentLabel="Example Modal"
        >
          {modalList.map((item) => { return <ModalList key={item.id} item={item} quit={closeModal} /> })}
        </Modal>
      </div>

      {/* FORM */}


      <div className='App'>
        <Form handleNew={handleAdd} />
      </div>

      {/* NOTES LIST */}
      <div className='notes-list'>
        {list.map((item) => { return <List key={item.id} item={item} quit={del} addModal={openModal} /> })}
      </div>

    </>
  );
}

export default App;



And this is the ModalList.jsx file:

const ModalList = (props) => {
    const { item, quit} = props;

    /*LIST */
    return (
        <li ><button className='delete' onClick={()=>quit(item.id)}>x</button><p className='note-title'>{item.title}</p><p>{item.date}</p><p className='note-name'>{item.name}</p> </li>


    );
}
 
export default ModalList;

I know I have to someway filter the object by its ID so that only appears what I clicked and not all the existing elements in the list, but I'm not finding the way.

Thanks a lot!

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Answer

You are using Array.map here which is doing what it's supposed to do (listing the items), instead you should be using Array.filter which would return the ModalItem you need

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source: stackoverflow.com
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