6-6. 리스트 데이터 수정하기 (UPDATE)

App.js

import { useRef, useState } from "react";
import DiaryEditor from "./DiaryEditor";
import DiaryList from "./DiaryList";
import "./App.css";

const App = () => {
  // 전역적으로 Data 관리할 state
  const [data, setData] = useState([]);
  const dataId = useRef(0);

  const onCreate = (author, content, emotion) => {
    const created_date = new Date().getTime();
    const newItem = {
      author,
      content,
      emotion,
      created_date,
      id: dataId.current,
    };
    dataId.current += 1;
    setData([newItem, ...data]); // 새로운 일기를 제일 위로 보내기 위해서
  };

  const onRemove = (targetId) => {
    console.log(`${targetId}가 삭제되었습니다.`);
    // filter 기능을 통해 그 부분만 빼고 출력 된다.
    const newDiaryList = data.filter((it) => it.id !== targetId);
    setData(newDiaryList);
  };

  const onEdit = (targetId, newContent) => {
    setData(
      data.map((it) =>
        it.id === targetId ? { ...it, content: newContent } : it
      )
    );
  };

  return (
    <div className="App">
      <DiaryEditor onCreate={onCreate} />
      <DiaryList onEdit={onEdit} onRemove={onRemove} diaryList={data} />
    </div>
  );
};

export default App;

DiaryEditor

import React, { useRef, useState } from "react";

const DiaryEditor = ({ onCreate }) => {
  const authorInput = useRef();
  const contentInput = useRef();

  const [state, setState] = useState({
    author: "",
    content: "",
    emotion: 1,
  });

  const handleChangeState = (e) => {
    setState({
      ...state,
      [e.target.name]: e.target.value,
    });
  };

  const handleSubmit = () => {
    if (state.author.length < 1) {
      // focus
      authorInput.current.focus();
      return;
    }
    if (state.content.length < 5) {
      contentInput.current.focus();
      // focus
      return;
    }
    onCreate(state.author, state.content, state.emotion);
    alert("저장 성공");
    setState({
      author: "",
      content: "",
      emotion: 1
    })
  };

  return (
    <div className="DiaryEditor">
      <h2>✨오늘의 일기✨</h2>
      <div>
        <input
          ref={authorInput}
          name="author"
          value={state.author}
          onChange={handleChangeState}
        />
      </div>
      <div>
        <textarea
          ref={contentInput}
          name="content"
          value={state.content}
          onChange={handleChangeState}
        />
      </div>
      <div>
        <span>오늘의 감정점수 : </span>
        <select
          name="emotion"
          value={state.emotion}
          onChange={handleChangeState}
        >
          <option value={1}>1</option>
          <option value={2}>2</option>
          <option value={3}>3</option>
          <option value={4}>4</option>
          <option value={5}>5</option>
        </select>
      </div>
      <div>
        <button onClick={handleSubmit}>일기 저장하기</button>
      </div>
    </div>
  );
};
export default DiaryEditor;

DiaryList.js

import DiaryItem from "./DiaryItem";

const DiaryList = ({ onEdit, onRemove, diaryList }) => {
  return (
    <div className="DiaryList">
      <h2>일기 리스트</h2>
      <h4>{diaryList.length}개의 일기가 있습니다.</h4>
      <div>
        {diaryList.map((it) => (
          <DiaryItem key={it.id} {...it} onEdit={onEdit} onRemove={onRemove} />
        ))}
      </div>
    </div>
  );
};

// defaultProps는 undefined로 전달 될 수 있는 값을 default로 설정해주는 것
DiaryList.defaultProps = {
  diaryList: [],
};

export default DiaryList;

DiaryItem.js

import { useRef, useState } from "react";
const DiaryItem = ({
  onEdit,
  onRemove,
  author,
  content,
  created_date,
  emotion,
  id,
}) => {
  const [isEdit, setIsEdit] = useState(false);
  const toggleIsEdit = () => setIsEdit(!isEdit);
  const [localContent, setLocalContent] = useState(content);
  const localContentInput = useRef();

  const handleRemove = () => {
    if (window.confirm(`${id}번째 일기를 정말 삭제하시겠습니까?`)) {
      onRemove(id);
    }
  };

  const handleQuitEdit = () => {
    setIsEdit(false);
    setLocalContent(content);
  };

  const handleEdit = () => {
    if (localContent.length < 5) {
      localContentInput.current.focus();
      return;
    }
    if (window.confirm(`${id}번째 일기를 수정하시겠습니까?`)) {
      onEdit(id, localContent);
      toggleIsEdit();
    }
  };

  return (
    <div className="DiaryItem">
      <div className="info">
        <span className="author_info">
          작성자 : {author} | 감정: {emotion}
        </span>
        <br />
        <span className="date">{new Date(created_date).toLocaleString()}</span>
      </div>
      <div className="content">
        {isEdit ? (
          <>
            <textarea
              ref={localContentInput}
              value={localContent}
              onChange={(e) => setLocalContent(e.target.value)}
            />
          </>
        ) : (
          <>{content}</>
        )}
      </div>
      {isEdit ? (
        <>
          <button onClick={handleQuitEdit}>수정 취소</button>
          <button onClick={handleEdit}>수정완료</button>
        </>
      ) : (
        <>
          <button onClick={handleRemove}>삭제하기</button>
          <button onClick={toggleIsEdit}>수정하기</button>
        </>
      )}
    </div>
  );
};

export default DiaryItem;