create-react-app做的留言板
先看一下我们的留言板，然后在去实现功能
做留言板首先要配置好我们的文件，然后才能接着做我们的留言板
快速开始：
npminstall-gcreate-react-app /*安装create-react-app，建议使用cnpm*/ create-react-appmyapp /*使用命令创建应用，myapp为项目名称*/ cdmyapp /*进入目录，然后启动*/ npmstart
接下来看看我们的代码吧
index.html
<body>
<div id="app">
</div>
<script src="/assets/bundle.js"></script>
</body>
index.js
import React from 'react';
import ReactDOM from 'react-dom';
import LiuApp from './LiuApp';
import './bootstrap/dist/css/bootstrap.min.css';
ReactDOM.render(<LiuApp/>,document.getElementById("app"));
LiuApp.js
import React from 'react';
import LiuList from './LiuList';
import LiuForm from './LiuForm';
class LiuApp extends React.Component{
constructor(props){
super(props);
this.ids=1;
this.state={
todos:[]
};
this.addItem=this.addItem.bind(this);
this.deleteItem=this.deleteItem.bind(this);
}
deleteItem(id){
let newtodos=this.state.todos.filter((item)=>{
return !(item.id==id)
});
this.setState({
todos:newtodos
});
}
addItem(value){
this.state.todos.unshift(
{
id:this.ids++,text:value,time:(new Date()).toLocaleString(),done:0
}
)
this.setState({
todos:this.state.todos
});
}
render(){
return (
<div className="container">
<br/>
<br/>
<br/>
<br/>
<div className="panel panel-default">
<div className="panel-headingbg-danger">
<h1 className="text-center ">留言板</h1>
<hr/>
</div>
<div className="panel-body">
<LiuList deleteItem={this.deleteItem} data={this.state.todos}/>
<LiuForm addItem={this.addItem}/>
</div>
</div>
</div>
);
}
}
export default LiuApp;
LiuList.js
import React from 'react';
import LiuItem from './LiuItem';
class LiuList extends React.Component{
render(){
let todos=this.props.data;
let todoItems=todos.map(item=>{
return <LiuItem deleteItem={this.props.deleteItem} key={item.id} data={item}/>
});
return (
<table className="table table-striped">
<thead>
<tr>
<th>留言板</th>
</tr>
</thead>
<tbody>
{todoItems}
</tbody>
</table>
);
}
}
export default LiuList;
LiuForm.js
import React from 'react';
class LiuForm extends React.Component{
tijiao(event){
event.preventDefault();
}
add(event){
if(event.type=="keyup"&&event.keyCode!=13){
return false;
}
let txt=this.refs.txt.value;
if(txt=="") return false;
this.props.addItem(txt);
this.refs.txt.value="";
}
render(){
return(
<form className="form-horizontal" onSubmit={this.tijiao.bind(this)}>
<div className="form-group">
<div className="col-sm-10">
<input ref="txt" type="text" className="form-control" onKeyUp={this.add.bind(this)} id="exampleInputName2" placeholder="添加新留言"/>
</div>
<div className="col-sm-2">
<button type="button" className="btn btn-primary" onClick={this.add.bind(this)}>留言</button>
</div>
</div>
</form>
);
}
}
export default LiuForm;
LiuItem.js
import React from 'react';
class LiuItem extends React.Component{
delete(){
this.props.deleteItem(this.props.data.id);
}
render(){
let {text,time,done,id}=this.props.data;
return (
<tr>
<td>{time}<br/><br/>{text}</td>
<td>
<br/>
<br/>
<a onClick={this.delete.bind(this)}>删除留言</a>
</td>
</tr>
);
}
}
export default LiuItem;
以上就是多有的代码，现在看看我们最终的结果
原文链接：https://www.f2er.com/react/303347.html
