提供了编程的基础技术教程

zl程序教程

您现在的位置是：首页 >  前端

当前栏目

[Recompose] Stream Props to React Children with RxJS

React to with stream Rxjs Props children
2023-09-14 09:00:50 时间

You can decouple the parent stream Component from the mapped React Component by using props.children instead. This process involves mapping the stream to React’s cloneElement with the children then passing the props in manually.

 

We have the code below:

import React from "react"
import { render } from "react-dom"
import { Observable } from "rxjs"
import config from "recompose/rxjsObservableConfig"
import {
  setObservableConfig,
  componentFromStream,
  createEventHandler
} from "recompose"

setObservableConfig(config)

const Counter = ({ value, onInc, onDec }) => (
  <div>
    <button onClick={onInc}>+</button>
    <h2>{value}</h2>
    <button onClick={onDec}>-</button>
  </div>
)

const CounterStream = componentFromStream(
  props$ => {

    const { stream: onInc$, handler: onInc } = createEventHandler();
    const { stream: onDec$, handler: onDec } = createEventHandler();

    return props$
      .switchMap(
      propos => Observable.merge(
        onInc$.mapTo(1),
        onDec$.mapTo(-1)
      )
        .startWith(propos.value)
        .scan((acc, curr) => acc + curr)
        .map((value) => ({ value, onInc, onDec })))
      .map(
      Counter
      )
  }
);


const App = () => (
  <div>
    <CounterStream value={3} />
  </div>
)

render(<App />, document.getElementById("root"))

 

Now inside we use:

<CounterStream value={4} />

We want pass child into it:

const App = () => (
  <div>
    <CounterStream value={3}>
      <Counter />
    </CounterStream>
  </div>
)

 

So now, instead we map to Counter map in the JXS, we want to clone the child elemenet and pass down new props:

const CounterStream = componentFromStream(
  props$ => {

    const { stream: onInc$, handler: onInc } = createEventHandler();
    const { stream: onDec$, handler: onDec } = createEventHandler();

    return props$
      .switchMap(
      props => Observable.merge(
        onInc$.mapTo(1),
        onDec$.mapTo(-1)
      )
        .startWith(props.value)
        .scan((acc, curr) => acc + curr)
        .map((value) => ({ ...props, value, onInc, onDec }))
      ).map(props =>
        cloneElement(props.children, props)
      )
  }
);

 

 

相关文章