React实现评论的添加和删除

本文实例为大家分享了React实现评论添加和删除的具体代码，供大家参考，具体内容如下

一、效果图

二、需求描述

1. 手动输入用户名和评论内容，点击提交；输入内容被追加到右侧评论列表；

2.  点击评论列表的“删除”按钮，弹框提示确定删除用户“xx”；

3. 点击“确定”，“xx”用户发表的评论被删除；

4. 所有评论均被删除时，显示“暂无评论，点击添加评论！！！”

三、代码实现

App.js

import React from 'react';
import './App.css';
import CommentAdd from '../src/components/CommentAdd'
import CommentList from '../src/components/CommentList'
import PropTypes from 'prop-types'
import "../src/assets/css/bootstrap.css"
 
class App extends React.Component {
 // 给组件对象指定state属性
 // 初始化状态
 state = {
 comments: [
  {username: "Tom", content: "React太容易了"},
  {username: "Jack", content: "React太难了"}
 ]
 }
 
 static propTypes = {
 comments: PropTypes.array.isRequired,
 addComment: PropTypes.func.isRequired,
 deleteComment: PropTypes.func.isRequired
 }
 
 addComment = (comment) => {
 // 将添加的评论追加到评论list上
 const {comments} = this.state
 comments.unshift(comment)
 // 更新状态
 this.setState({comments})
 }
 deleteComment = (index) => {
 const {comments} = this.state
 comments.splice(index, 1)
 this.setState({comments})
 }
 
 render() {
 const {comments} = this.state
 return (
  
  

   
   
    
    评论管理列表
    
   
   
  
  
   
   
  
  
 );
 }
}
 
export default App;

CommentAdd.js

import React, {Component} from 'react';
import PropTypes from 'prop-types'
import "../assets/css/bootstrap.css"
 
class CommentAdd extends Component {
 
 state = {
 username: "",
 content: ""
 }
 
 static propTypes = {
 addComment: PropTypes.func.isRequired
 }
 handleNameChange = (event) => {
 const username = event.target.value
 this.setState({username});
 }
 handleContentChange = (event) => {
 const content = event.target.value
 this.setState({content});
 }
 handleSubmit = () => {
 const comment = this.state
 this.props.addComment(comment)
 // 清楚输入数据
 this.setState({
  username: "",
  content: ""
 });
 }
 
 render() {
 const {username, content} = this.props
 return (
  
  
  
 );
 }
}
 
export default CommentAdd;

CommentList.js

import React, {Component} from 'react';
import CommentItem from "./CommentItem";
import PropTypes from 'prop-types'
import "../assets/css/comment_list.css"
 
class CommentList extends Component {
 
 static propTypes = {
 comments: PropTypes.array.isRequired,
 deleteComment: PropTypes.func.isRequired
 }
 
 render() {
 const {comments, deleteComment} = this.props
 const display = comments.length === 0 ? "block" : "none"
 return (
 
  
  评论回复：
  
暂无评论，点击添加评论！！！
  

   {
   comments.map((comment, index) => 

   
)
   }
  
  
 );
 }
}
 
export default CommentList;

CommentItem.js

import React, {Component} from 'react';
import PropTypes from 'prop-types'
import "../assets/css/comment_item.css"
 
class CommentItem extends Component {
 static propTypes = {
 comments: PropTypes.array.isRequired,
 deleteComment: PropTypes.func.isRequired,
 index: PropTypes.number.isRequired
 }
 
 handleDeleteComment = () => {
 const {comments, deleteComment, index} = this.props
 if (window.confirm(`确定删除${comments.username}嘛？`)) {
  deleteComment(index)
 }
 }
 
 render() {
 const {comments} = this.props
 return (
  
  
   删除
  
  
{comments.username}说：
  
{comments.content}
  
 );
 }
}
 
export default CommentItem;

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。