首先,咱们须要搭建一个React环境,用来实现效果:css
先安装React,这里我用的并非最新版本的,因此须要选择一个版本:html
jspm install react@0.14.0-rcl
安装完成后,接着安装一个react-dom:react
jspm install react-dom@0.14.0-rcl
semantic-ui,这个插件并非react必装的,这只是一个样式插件,装不装均可以,可是我这里图个方便就装上了:ajax
jspm install semantic-ui
在这里直接把semantic引入,因此须要安装一个css插件:json
jspm install css
而后用browser-sync建立一个服务器,用来监视一些文件的变化:浏览器
browser-sync start --server --no-notify --files 'index.html. app/**/*.js'
这里我用了一个System来导入app底下的mian.js:服务器
打开main.js,在里面把css样式引进来:app
"use strict"; import 'semantic-ui/semantic.min.js!';
下面是一个简单的排版,来看一下css样式:dom
<div class="ui container" style="padding:30px"> <div id="app"></div> </div>
建立一个comment文件,在文件下面建立一个CommentBox.js:jsp
'use strice'; import React from 'react'; //导入react; class CommentBox extends React.Component{ constructor(props){ spuer(props); this.state = {data:[]}; this.getComments(); // setInterval(() => this.getComments(),5000); } handleCommentSubmit(comment){ let comments = this.state.data, newComments = comments.concat(comment); this.setState({data:newComments}); } getComments(){ $.ajax({ url:this.props.url, dataType:'json', cache:false, success:comments => { this.set({data:comments}); }, error:(xhr,status,error) => { console.log(error); } }); } render(){ return ( <div className = "ui comments"> <h1>评论</h1> <div className = "ui divider"></div> <CommentList data={this.states.data}/> <CommentForm onCommentSumit = {this.handleCommentSubmit.bind(this)}/> </div> ); } } export{CommentBox as default}; //做为一个默认的东西导出;
在网页中显示页面须要在main.js里面导入一些文件:
- html: <div class="ui container" style="padding:30px"> <div id="app"></div> </div> <script src="jspm_packages/system.js"></script> <script src="config.js"></script> <script> System.impore('app/main'); </script> - main.js: 'use strict' import 'semantic-ui/semantic.min.css!'; import React from 'react'; import ReactDOM from 'react-dom'; import CommentBox from './comment/CommentBox'; ReactDOM.render( <CommentBox url="comments.json" />, document.getElementById("app") );
接下来咱们须要在定义两个组件,来把它们连在一块儿:
评论列表的组件(CommentList.js):
'use strict'; import React from 'react'; import Comment from './Comment'; class CommentList extends React.Component{ render(){ let commentNodes = this.props.data.map(comment => { return( <Comment author={comment.author} data={comment.data}> {comment.text} </Comment> ); }) return( <div> {commentNodes} </div> ); } } export {CommentList as default};
评论表单的组件(CommentForm.js):
'use strict'; import React from 'react'; class CommentForm extends React.Component{ handleSubmit(event){ event.preventDefult(); console.log("提交表单。。。。"); let author = this.refs.author.value, text = this.refs.txte.value; console.log(author,text); this.props.onCommentSubmit({author,text,date:"刚刚"}); } render(){ return( <from className = "ui reply form" onSubmit = {this.handleSubmit.bind(this)}> <div className="field"> <input type="text" placeholder="姓名" ref="author"/> </div> <div className="field"> <textarea placeholder="评论" ref="text"></textarea> </div> <button type="submit" className="ui blue button"> 添加评论 </button> </from> ); } } export {CommentForm as default};
而后定义一个Cmment.js的一个组件,放到CommentList.js里面,而后在从CommentList.js里面传递一些数据到Cmment.js里面:
Cmment.js:
'use strict' import React from 'react'; class Comment extends React.Comment{ render (){ return ( <div className="comment"> <div className="content"> <span className="author">{this.props.author}</span> <div className="metadata"> <span className="date">{this.props.date}</span> </div> <div className="text">{this.props.children}</div> </div> </div> ); } } export {Comment as default};
CommentList.js:
'use strict'; import React from 'react'; import Comment from './Comment'; //引进Comment.js; class CommentList extends React.Component{ render(){ let commentNodes = this.props.data.map(comment => { return( <Comment author={comment.author} data={comment.data}> {comment.text} </Comment> ); }) return( <div> {commentNodes} </div> ); } } export {CommentList as default};
注释:这事浏览器会显示一些内容,这些内容就是从render这个方法里面传递给CommentBox.js这个组件,而后再从CommentBox.js传递给CommentList.js,在CommentList.js这个组件里面循环的处理了一下每一条评论的内容,每一次都会用一次Comment这个组件,而后把评论的内容传递给Comment;
从服务端请求数据:
建立一个Comments.json文件:
[ {"author":"姜姜","date":"5 分钟前","text":"天气不错啊!!!"}, {"author":"筱妍","date":"3 分钟前","text":"出去玩啊!!!"}, {"author":"吴建","date":"1 分钟前","text":"去哪玩啊!!!"} ]
从服务端请求数据:
$.ajax({ url:this.props.url, dataType:'json', cache:false, success:comments => { this.set({data:comments}); }, error:(xhr,status,error) => { console.log(error); } });
为了页面的数据和服务端的保持联系,设置每隔五秒向服务端发生一次请求:
constructor(props){ spuer(props); this.state = {data:[]}; this.getComments(); setInterval(() => this.getComments(),5000); } getComments(){ $.ajax({ url:this.props.url, dataType:'json', cache:false, success:comments => { this.set({data:comments}); }, error:(xhr,status,error) => { console.log(error); } }); }
在CommentForm.js帮顶一下事件:
class CommentForm extends React.Component{ handleSubmit(event){ event.preventDefult(); console.log("提交表单。。。。"); let author = this.refs.author.value, text = this.refs.txte.value; console.log(author,text); this.props.onCommentSubmit({author,text,date:"刚刚"}); } render(){ return( <from className = "ui reply form" onSubmit = {this.handleSubmit.bind(this)}> <div className="field"> <input type="text" placeholder="姓名" ref="author"/> </div> <div className="field"> <textarea placeholder="评论" ref="text"></textarea> </div> <button type="submit" className="ui blue button"> 添加评论 </button> </from> ); } }
接下来咱们能够把写的内容输出到控制台上:
把提交的内容交给服务端处理:
在CommentBox.js上面添加一个方法:
handleCommentSubmit(comment){ let comments = this.state.data, newComments = comments.concat(comment); this.setState({data:newComments}); } //这个方法就是告诉CommentBox.js,有人提交数据,就把这条数据放在这个方法里面执行一次;