我们可以将 setState 作为 props 从一个组件传递到另一个组件并在 React 中从子组件更改父状态吗? [英] Can we pass setState as props from one component to other and change parent state from child component in React?

问题描述

 class App extends Component {构造函数(){极好的();this.state = {名称:'反应'};this.setState=this.setState.bind(this)}使成为() {返回 (<div><Hello name={this.state.name}/><p>开始编辑以看到一些奇迹发生:)</p><孩子{...this}/>

);}}子组件var Child=(self)=>{返回(<button onClick={()=>{自我 .setState({名称:"viswa"})}}>点击</button>)

这里我绑定了 setState 函数并将其作为道具发送给子组件.这会改变父组件的状态.这是正确的方法吗?

解决方案

但这比传递函数简单.如果我想改变很多状态改变.与传递函数相比，这将是简单快捷的方法，对吗?

执行此操作的正确方法与您的方法一样简单，并且不会违反最佳做法:

class App 扩展组件 {状态 = {name: '反应',};使成为() {返回 (<div><Hello name={this.state.name}/><p>开始编辑以看到一些奇迹发生:)</p><Child onClick={() =>this.setState({name: 'viswa'})}/>

);}}const Child=({onClick})=>(<button onClick={onClick}>点击</button>);

 class App extends Component {
  constructor() {
    super();
    this.state = {
      name: 'React'
    };
    this.setState=this.setState.bind(this)
  }

  render() {
    return (
      <div>
        <Hello name={this.state.name} />
        <p>
          Start editing to see some magic happen :)
        </p>
        <Child {...this}/>
      </div>
    );
  }
}

child Component
var Child=(self)=>{
  return(
    <button  onClick={()=>{
      self .setState({
        name:"viswa"
      })
    }}>Click </button>
  )

here I am binding the setState function and send this as props to child component.This will change state of parent from child.Is this proper way?

解决方案

But this is simple than passing function.If I want change many state change. this will be simple and faster way compare to passing function right ?

The correct way to do this is as simple as yours and does not violate best practices:

class App extends Component {
  state = {
      name: 'React',
  };

  render() {
    return (
      <div>
        <Hello name={this.state.name} />
        <p>
          Start editing to see some magic happen :)
        </p>
        <Child onClick={() => this.setState({name: 'viswa'})}/>
      </div>
    );
  }
}

const Child=({onClick})=>(
    <button onClick={onClick}>Click</button>
);

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