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Programming/Javascript

React기초- 9.Delete

by Wilkyway 2020. 7. 29.

마지막으로 Delete 기능을 알아보겠습니다.

Delete 기능은 App.js 내부에서만 다루며, 그 중에서도 Control 컴포넌트 안에서만 구현하는 것으로 충분합니다.

 

App.js

import React, { Component } from 'react';
import Subject from './components/Subject';
import TOC from './components/TOC';
import ReadContent from './components/ReadContent';
import CreateContent from './components/CreateContent';
import UpdateContent from './components/UpdateContent';
import Control from './components/Control';
import './App.css';

class App extends Component {
  constructor(props) {
    super(props);
    this.max_content_id = 3;
    this.state = {
      mode: 'welcome',
      selected_content_id: 2,
      welcome: { title: 'welcom', desc: 'Hello, React!!' },
      subject: { title: 'WEB', sub: 'world wide web!' },
      contents: [
        { id: 1, title: 'HTML', desc: 'HTML is HyperText ...' },
        { id: 2, title: 'CSS', desc: 'CSS is for design' },
        { id: 3, title: 'Javascript', desc: 'JavaScript is for interactive' }
      ]
    }
  }

  getReadContent() {
    var i = 0;
    while (i < this.state.contents.length) {
      var data = this.state.contents[i];
      if (data.id === this.state.selected_content_id) {
        return data;
        break;
      }
      i = i + 1;
    }
  }

  getContent() {
    var _title, _desc, _article = null;
    if (this.state.mode === 'welcome') {
      _title = this.state.welcome.title;
      _desc = this.state.welcome.desc;
      _article = <ReadContent title={_title} desc={_desc}></ReadContent>
    } else if (this.state.mode === 'read') {
      var _content = this.getReadContent();
      _article = <ReadContent title={_content.title} desc={_content.desc}></ReadContent>
    } else if (this.state.mode === 'create') {
      _article = <CreateContent onSubmit={function (_title, _desc) {
        this.max_content_id = this.max_content_id + 1;
        var _contents = Array.from(this.state.contents)
        _contents.push({ id: this.max_content_id, title: _title, desc: _desc })
        this.setState({
          contents: _contents,
          mode: 'read',
          selected_content_id: this.max_content_id
        })
      }.bind(this)}></CreateContent>
    } else if (this.state.mode === 'update') {
      _content = this.getReadContent();
      _article = <UpdateContent data={_content} onSubmit={function (_id, _title, _desc) {
        var _contents = Array.from(this.state.contents)
        var i = 0;
        while (i < _contents.length) {
          if (_contents[i].id === _id) {
            _contents[i] = { id: _id, title: _title, desc: _desc }
            break;
          }
          i = i + 1;
        }
        this.setState({
          contents: _contents,
          mode: 'read'
        })
      }.bind(this)}></UpdateContent>
    }
    return _article;
  }
  render() {

    return (
      <div className="App">
        <Subject
          title={this.state.subject.title}
          sub={this.state.subject.sub}
          onChangePage={function () {
            this.setState({ mode: 'welcome' });
          }.bind(this)}
        />

        <TOC
          onChangePage={function (id) {
            this.setState({
              mode: 'read',
              selected_content_id: Number(id)
            });
          }.bind(this)}
          data={this.state.contents} />

        <Control
          onChangeMode={function (_mode) {
            if (_mode === 'delete') {           //delete 모드로 진입
              if (window.confirm('really?')) {  // 경고창에서 확인한 경우에만 실행
                var _contents = Array.from(this.state.contents);  // 배열 복제
                var i = 0;
                while (i < this.state.contents.length) {
                  if (_contents[i].id === this.state.selected_content_id) { // i번째 요소가 selected_content_id와 같을 경우
                    _contents.splice(i, 1); // i번째 요소로부터 1개 삭제(본인)
                    break;
                  }
                  i = i + 1;
                }
                this.setState({
                  mode: 'welcome',    //삭제한 후에는 welcome화면으로
                  contents: _contents // 새로운 배열을 기존 배열로 덮어쓰기
                })
              }
            } else {
              this.setState({
                mode: _mode
              });
            }
          }.bind(this)} />

        {this.getContent()}
      </div>
    );
  }
}


export default App;

 

 

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