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[英]update react child component's state using props received from an async api call made in the parent component
[英]React: Using Child checkbox to update Parent component's state
我有以下父項組件:
export class Parent extends Component {
constructor(props) {
super(props)
state = {
value: 0
}
}
}
render() {
return (
<Child />
)
}
還有以下子組件:
export class Parent extends Component {
constructor(props) {
super(props)
state = {
num: 0
}
}
}
toggleCheckboxChange = () => {
this.setState({ num: 5})
}
render() {
return (
<div>
<label>
{this.state.num}
<input type="checkbox" onChange={this.toggleCheckboxChange}
/>
</label>
</div>
)
}
我想用的復選框子狀態設置num
到5,然后傳遞到家長的狀態value
。
最好的方法是什么?
就像我在評論中說的那樣,最簡單的方法是將狀態移到父級。
import React, {Component} from 'react';
import {render} from 'react-dom';
class Parent extends Component {
state = {
value: 0
}
toggleCheckboxChange = ev => {
this.setState({value: 5})
}
render() {
return (
<Child num={this.state.value} toggleCheckboxChange={this.toggleCheckboxChange}/>
);
}
}
function Child({num, toggleCheckboxChange}) {
return (
<div>
<label>
{num}
<input type="checkbox" onChange={toggleCheckboxChange}
/>
</label>
</div>
)
}
render(<Parent/>, document.getElementById('root'));
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