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<p>I am learning React and learned some basics, so I used this knowledge to make this basic project. I'm making a simple note-saving app using React and Firebase. </p> <p>The data is transferred to the Firebase database flawlessly. </p> <p>Get data. </p> <p>The problem I am facing is that the data fetched is not updated in the UI. </p> <p><br /></p> <pre class="snippet-code-js lang-js prettyprint-override"><code>import { useEffect, useState } from 'react'; import { AiFillCaretUp } from 'react-icons/ai'; import './Card.css'; export default function Card(props) { const [showPara, setShowPara] = useState(false); const [data, setData] = useState([]); console.log('inside card'); useEffect(() => { let notesData = []; console.log('inside UseEffect'); const fetchNote = async () => { const response = await fetch('https://notes-keeper-react-default-rtdb.firebaseio.com/notes.json'); const data = await response.json(); for (const key in data) { notesData.push({ id: key, title: data[key].title, note: data[key].note }); } }; fetchNote(); // console.log(notesData); setData(notesData); }, []); const toggleHandler = () => { setShowPara((preVal) => !preVal); }; const paraClass = showPara ? 'card-para toggle' : 'card-para'; const rotate = showPara ? 'icon rotate' : 'icon'; return ( <div className='container'> {console.log('inside card container', data)} {data.map((card) => ( <div className='card' key={card.id}> <div className='card-title' onClick={toggleHandler}> <h3>{card.title}</h3> <AiFillCaretUp className={rotate} /> </div> <div className={paraClass}> <p>{card.note}</p> </div> </div> ))} </div> ); }</code></pre> <p><br /></p> <p>Show data here</p> <pre class="brush:php;toolbar:false;">{console.log('inside card container', data)}</pre> <p>But it doesn’t work</p> <pre class="brush:php;toolbar:false;">{data.map((card) => ( <div className='card' key={card.id}> <div className='card-title' onClick={toggleHandler}> <h3>{card.title}</h3> <AiFillCaretUp className={rotate} /> </div> <div className={paraClass}> <p>{card.note}</p> </div> </div> ))} </div></pre> <p>I hope you understand the problem. </p>

useEffect(() => {
    let notesData = [];
    const fetchNote = async () => {
      const response = await fetch('https://notes-keeper-react-default-rtdb.firebaseio.com/notes.json');
      const data = await response.json();
      for (const key in data) {
        notesData.push({ id: key, title: data[key].title, note: data[key].note });
      }
      setData(notesData); // 在這里數(shù)據(jù)已經(jīng)準(zhǔn)備好了
    };
    fetchNote();
  }, []);

useEffect(() => {
    let notesData = [];
    const fetchNote = async () => {
      const response = await fetch('https://notes-keeper-react-default-rtdb.firebaseio.com/notes.json');
      const data = await response.json();
      for (const key in data) {
        notesData.push({ id: key, title: data[key].title, note: data[key].note });
      }
      return notesData; // 返回一個解析為 'notesData' 的 promise
    };

    fetchNote()
      .then((updatedData) => {
        setData(updatedData);
      })
  }, []);