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 (
<div>
<header className="site-header jumbotron">
<div className="container">
<div className="row">
<div className="col-xs-12">
<h2>评论管理列表</h2>
</div>
</div>
</div>
</header>
<div className="container">
<CommentAdd addComment={this.addComment}/>
<CommentList comments={comments} deleteComment={this.deleteComment}/>
</div>
</div>
);
}
}
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 (
<div className="col-md-4">
<form className="form-horizontal">
<div className="form-group">
<label>用户名：</label>
<input type="text" className="form-control" placeholder="请输入用户名" value={username}
onChange={this.handleNameChange}/><br/>
</div>
<div className="form-group">
<label>评论内容：</label>
<textarea className="form-control" rows="6" placeholder="请输入评论内容"
value={content} onChange={this.handleContentChange}>
</textarea>
</div>
<div className="form-group">
<div className="col-sm-offset-2 col-sm-10">
<button type="button" className="btn btn-default pull-right"
onClick={this.handleSubmit}>提交
</button>
</div>
</div>
</form>
</div>
);
}
}
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 (
<div className="col-md-8">
<h4>评论回复：</h4>
<h5 style={{display}}>暂无评论，点击添加评论！！！</h5>
<ul>
{
comments.map((comment, index) => <li key={index}><CommentItem comments={comment} index={index}
deleteComment={deleteComment}/>
</li>)
}
</ul>
</div>
);
}
}
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 (
<div className="list-group-item">
<div className="handle">
<a href="javascript:;" rel="external nofollow" onClick={this.handleDeleteComment}>删除</a>
</div>
<p className="user"><span>{comments.username}</span><span>说：</span></p>
<p className="centence">{comments.content}</p>
</div>
);
}
}
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。
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