我正在开发一个将帖子添加到表中的应用程序。我下面的代码不起作用。它给了我这个错误:
Uncaught TypeError:无法读取的空(…)属性“props”
函数handleadNew()
import React from 'react';
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
number:'1',
name:'gogo',
title:'',
views:'10',
likes:'22',
date:'1.1.1111'
};
}
addPost(title){
this.state.title.push(title);
this.setState({
post: this.state.title
});
}
render() {
return (
<div>
<AddPost addNew={this.addPost} />
<table>
<thead>
<Thead/>
</thead>
<tbody>
<Row number={this.state.number}
name={this.state.name}
title={this.state.title}
views={this.state.views}
likes={this.state.likes}
date={this.state.date}/>
</tbody>
</table>
</div>
);
}
}
class AddPost extends React.Component{
constructor(props) {
super(props);
this.state = {
newPost: ''
}
this.updateNewPost = this.updateNewPost.bind(this);
}
updateNewPost(e){
this.setState({newPost: e.target.value});
}
handleAddNew(){
this.props.addNew(this.state.newPost);
this.setState({newPost: ''});
}
render(){
return (
<div>
<input type="text" value={this.state.newPost} onChange={this.updateNewPost} />
<button onClick={this.handleAddNew}> Add Post </button>
</div>
);
}
}
class Thead extends React.Component {
render() {
return (
<tr>
<td id='number'>ID</td>
<td id='name'>User name</td>
<td id='title'>Post title</td>
<td id='views'>Views</td>
<td id='likes'>Likes</td>
<td id='date'>Created at</td>
</tr>
);
}
}
class Row extends React.Component {
render() {
return (
<tr>
<td>{this.props.number}</td>
<td>{this.props.name}</td>
<td>{this.props.title}</td>
<td>{this.props.views}</td>
<td>{this.props.likes}</td>
<td>{this.props.date}</td>
</tr>
);
}
}
export default App;
最佳答案
您没有将handleAddNew
绑定到需要添加的this
this.handleAddNew = this.handleAddNew.bind(this);
在你的构造器里
如果您使用的是babel并且有stage-2
插件,那么您可以将实例方法更改为箭头函数,如下所示:
handleAddNew = () => {
// do stuff
}
而不必在构造函数中绑定它。第一种方法是开箱即用的,但是如果你用的是babel,那么第二种方法肯定更干净。