React - 如何将props传递给作为prop传递的组件

Question

我有一个React组件(React v15.5.4),您可以将其他组件传递给:

class CustomForm extends React.Component {
  ...
  render() {
    return (
      <div>
          {this.props.component}
      </div>
    );
  }
}

我有一个使用它的不同组件:

class SomeContainer extends React.Component {
  ...
  render() {
    let someObjectVariable = {someProperty: 'someValue'};
    return (
      <CustomForm 
         component={<SomeInnerComponent someProp={'someInnerComponentOwnProp'}/>}
         object={someObjectVariable}
      />
    );
  }
}

一切都很好,但我想将someObjectVariable prop 传递给CustomForm中的子组件(在这种情况下,它将是SomeInnerComponent),因为在实际代码中你可以传递几个组件而不是像示例一样.

请注意,我还需要传递SomeInnerComponent自己的道具.

有没有办法做到这一点？

Answer 1

您可以使用React.cloneElement实现此目的.

像这样:

class CustomForm extends React.Component {
  ...
  render() {
    return (
      <div>
          {React.cloneElement(this.props.component,{ customProps: this.props.object })}
      </div>
    );
  }
}

工作守则:

class Parent extends React.Component{
  render() {
    return(
      <Child a={1} comp={<GChild/>} />
    )
  }
}

class Child extends React.Component{
  constructor(){
    super();
    this.state = {b: 1};
    this.updateB = this.updateB.bind(this);
  }
  
  updateB(){
    this.setState(prevState => ({b: prevState.b+1}))
  }
  
  render(){
    var Comp = this.props.comp;
    return (
      <div>
        {React.cloneElement(Comp, {b: this.state.b})}
        <button onClick={this.updateB}>Click to update b</button>
      </div>
    );
  }
}

const GChild = props => <div>{JSON.stringify(props)}</div>;
 
ReactDOM.render(
  <Parent />,
  document.getElementById('container')
);

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

<div id='container' />

Answer 2

您可以像对SomeInnerComponent.

只需传递命名道具。

里面CustomForm，

render() {

  const MyComponent = this.props.component; //stored it in some variable

    return (
      <div> 
         <MyComponent customProps = {this.props.object} /> //access object here and passed it or passed individual props
      </div>
    );
  }

编辑 ：

请找到working demo here.

Answer 3

您有几种选择来实现您的要求。

class SomeContainer extends React.Component {
  ...
  render() {
   let someObjectVariable = {someProperty: 'someValue'};
    return (
      <CustomForm 
       component={<SomeInnerComponent propFromParent={someObjectVariable}/>}
       object={someObjectVariable}
      />
    );
  }

}

或者您可以克隆组件道具并应用新道具，如 Mayank 所说。在你的情况下

class CustomForm extends React.Component {
  ...
  render() {
    return (
      <div>
        {React.cloneElement(this.props.component,
           {propFromParent:this.props.someObjectVariable})}
      </div>
  );
 }
}