React表单
首先,我们需要搭建一个React环境,用来实现效果:
先安装React,这里我用的并不是最新版本的,所以需要选择一个版本:
jspm install react@0.14.0-rcl
安装完成后,接着安装一个react-dom:
jspm install react-dom@0.14.0-rcl
semantic-ui,这个插件并不是react必装的,这只是一个样式插件,装不装都可以,但是我这里图个方便就装上了:
jspm install semantic-ui
在这里直接把semantic引入,所以需要安装一个css插件:
jspm install css
然后用browser-sync创建一个服务器,用来监视一些文件的变化:
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:
打开main.js,在里面把css样式引进来:
"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:
<div class="ui container" style="padding:30px">
<div id="app"></div>
</div>
下面我们就开始正式的编写程序了:
创建一个comment文件,在文件下面创建一个CommentBox.js:
'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}; //作为一个默认的东西导出;
在网页中显示页面需要在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")
);
接下来我们需要在定义两个组件,来把它们连在一起:
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};
然后定义一个Cmment.js的一个组件,放到CommentList.js里面,然后在从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,然后再从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,然后把评论的内容传递给Comment;
从服务端请求数据:
创建一个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>
);
}
}
接下来我们可以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;
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