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[英]How to update parent state and child components props at once (at the same time)
[英]how to pass a state as props which will update later with click event (and also keep the state updated at the same time)
React我試圖制作一個按鈕,該按鈕將顯示使用React狀態點擊了多少次。 但我想用很多組件來做到這一點。 所以我在父組件中用 setState 編寫了我的狀態和更新函數,並希望將狀態作為道具傳遞,但問題是我傳遞了一次狀態,然后在狀態更新后(單擊按鈕時)道具不會更新。 我看不到按鈕被點擊了多少次。
class App extends Component {
constructor(props) {
super(props);
this.state = {
count: 2,
};
}
clickCount() {
this.setState((prev) => {
return { count: prev.count + 1 };
})
}
render() {
return (
<div>
<MainContent
handler={this.clickCount} totalCount={this.state.count}/>
</div>
);
}
}
export default App;
您似乎錯過了將函數綁定到this
class App extends Component {
constructor(props) {
super(props);
this.state = {
count: 2,
};
this.clickCount = this.clickCount.bind(this); // you may have missed this..
}
clickCount() {
this.setState((prev) => {
return { count: prev.count + 1 };
})
}
render() {
return (
<div>
<MainContent handler={this.clickCount} totalCount={this.state.count}/>
</div>
);
}
}
export default App;
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