React JS：祖父组件的 setState 方法不会更新孙子输入字段的状态更改事件单击时

Question

在同一代码中，我能够获取祖父组件的setState方法，以相应地更新来自孙子组件的onClick事件，但是，对于onChange事件，它失败了。我没有收到任何错误。

class GrandChild extends React.Component {
constructor(props) {
super(props);
this.handleChange = this.handleChange.bind(this);
}
changeNumber=()=> {
this.props.changeNumber();//call child method
}
handleChange(e) {
this.props.onChange(e.target.value);
}
render() {
const data = this.props.data;
return(
<div>
<h1>The number is {this.props.number}</h1>
<input type="text" value = {data} onChange={this.handleChange} />
<button onClick={this.changeNumber}>Increase number by 1</button>
</div>
)
}
}
class Child extends React.Component {
render() {
return(
<div>
<GrandChild number={this.props.number} changeNumber={this.props.changeNumber} value={this.props.data} onChange={this.props.handleChange}/>
</div>
)
}
}
class App extends React.Component {
constructor() {
super()
this.state = {
number: 1,
data: ""
}
this.handleChange = this.handleChange.bind(this);
}
handleChange(data) {
this.setState({data:this.state.data});
console.log(data);
}  
changeNumber=()=>{

this.setState((prevState)=>{
console.log(prevState,this.state.data);
return {
number :  prevState.number + 1
}
});
}
render() {
const data = this.state.data;
const input = data;
return (
<Child number={this.state.number} 
changeNumber = {this.changeNumber} 
data={input} 
onChange = {this.handleChange}
/>
);
}
}
ReactDOM.render(<App />, document.getElementById('root'));

控制台结果：对象 { 数据："， 人数： 1 } "">

结果截图：控制台.log结果

请参阅实时代码的代码笔： https://codepen.io/codehorse/pen/yLyEwBw?editors=0011

Answer 1

通过现场演示改进的代码 https://codesandbox.io/s/laughing-sky-kk97b

需要改变什么<GrandChild number={this.props.number} changeNumber={this.props.changeNumber} value={this.props.data} onChange={this.props.onChange}/>

完整代码

class GrandChild extends React.Component {
constructor(props) {
super(props);
this.handleChange = this.handleChange.bind(this);
}
changeNumber = () => {
this.props.changeNumber(); //call child method
};
handleChange(e) {
this.props.onChange(e.target.value);
}
render() {
const data = this.props.data;
return (
<div>
<h1>The number is {this.props.number}</h1>
<input type="text" value={data} onChange={this.props.onChange} />
<button onClick={this.changeNumber}>Increase number by 1</button>
</div>
);
}
}
class Child extends React.Component {
render() {
return (
<div>
<GrandChild
number={this.props.number}
changeNumber={this.props.changeNumber}
value={this.props.data}
onChange={this.props.onChange}
/>
</div>
);
}
}
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
number: 1,
data: ""
};
}
handleChange = e => {
this.setState({ data: e.target.value });
console.log(e.target.value);
};
changeNumber = () => {
this.setState(prevState => {
console.log(prevState, this.state.data);
return {
number: prevState.number + 1
};
});
};
render() {
const data = this.state.data;
const input = data;
return (
<Child
number={this.state.number}
changeNumber={this.changeNumber}
data={input}
onChange={this.handleChange}
/>
);
}
}
export default App;