我如何在React中使用children道具删除组件

Question

I am trying to achieve this scenario:

1. I have Foo component with bar prop

2. If bar prop is true --> mount Bar component that is inside the Foo component

3. if bar prop is false --> unmount Bar component
4. I don't want Example component to be aware of this show/hide, I want only Foo to know when to show or hide it
5. Bar is not necessary a direct child of Foo, it can also be nested deeper in the children of Foo

 const Example = () => { return ( <Foo bar={true/false}> <div>some div</div> <Bar></Bar> </Foo> ) }; class Foo extends React.Component { componentWillReceiveProps({bar}) { if (bar) { /* I want to show bar!! */ } else { /* I want to remove only bar!! */ /* maybe doing something like: this.props.children.searchForBar().removeNode() */ } } render () { return ( <div>{this.props.children}</div> ) } }; const Bar = () => 'I am some bar'; 

I've tried to manipulate this.props.children but React blocked me from modifying children myself.

Do I need maybe an outer service for communication between these 2 components ?

Should I use context maybe ?

Looking for an advice on how to approach this issue.

Answer 1

One of possible solutions is to use some kind of message bus or pubSub. In that kind of approach, Bar component would have to subscribe to the bus, and show/hide itself. Foo component would publish appriopriate messages in componentWillReceiveProps. More: here

Answer 2

One simple solution is to use Bar component inside of the Foo component and render that based on a ternary condition .

Also return a JSX element(Valid react element from Bar component) rather than a string.

 const Example = () => { return ( <Foo bar={true}> <div>some div</div> </Foo> ) }; class Foo extends React.Component { render () { return ( <div> <div>{this.props.children}</div> {this.props.bar? <Bar />: null} </div> ) } }; const Bar = () => <div>I am some bar</div>; ReactDOM.render(<Example/>, document.getElementById('app')); 

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