Question

我有一个addHandler的道具从AddTodo传递到App.js组件。然后，在AddTodo处理程序中，我不确定如何将pluck和map结合起来，以便我能从pluck以及combineLatest内合并的map中获得价值

这是我的代码

App.js

import React from 'react';
import { componentFromStream , createEventHandler } from "recompose";
import { combineLatest } from "rxjs";
import { map, tap } from "rxjs/operators";
import AddTodo from './AddTodo/AddTodo';

import Todos from './Todos/todos';
// import User from './User/User';

const App = componentFromStream(prop$ => {
    const { handler: onAddHandler, stream: clickStream } = createEventHandler();
    const value$ = clickStream.pipe( tap(input =>
        console.warn(input)
        ));

    return combineLatest(prop$, value$).pipe(map(([props, value]) => <div>
          <AddTodo onAddHandler={onAddHandler}  />
          {/* <input placeholder="Add TODO" onChange={handler} /> */}
          <Todos todo={value} />
        </div>));
});


export default App;

AddTodo.js

import React from "react";
import { combineLatest } from "rxjs";
import { componentFromStream, createEventHandler } from "recompose";
import { pluck, map, startWith, tap } from "rxjs/operators";

const AddTodo = componentFromStream(prop$ => {
  const {
    handler: onChangeHandler,
    stream: inputStream
  } = createEventHandler();
  const value$ = inputStream.pipe(
    map(e => e.target.value),
    startWith("")
  );

  return combineLatest(prop$, value$).pipe(
    map(([props, value]) => (
      <div>
        <input
          type="text"
          placeholder="Add Todo..."
          onChange={onChangeHandler}
        />
        <button onClick={() => {}}>Add todo</button>
        {/* <button onClick={() => onAddHandler(value)}>Add todo</button> */}
      </div>
    ))
  );
});

export default AddTodo;

在地图内AddTodo.js内，我可能正在寻找

  return combineLatest(prop$, value$).pipe(
    pluck('onAddHandler'),
    // and use this value plus the belo values inside map
    map(([props, value]) => (

Answer 1

您需要做的就是将pluck移到combineLatest内，如下所示，然后应该在地图操作符中获取onAddHandler：

return combineLatest(prop$.pipe(pluck('onAddHandler')), value$).pipe(
  map(([onAddHandler, value]) => (
    <div>
      <input
        type="text"
        placeholder="Add Todo..."
        onChange={onChangeHandler}
      />
      <button onClick={() => {}}>Add todo</button>
      {/* <button onClick={() => onAddHandler(value)}>Add todo</button> */}
    </div>
  ))
);

合并来自pluck的值并在地图rxjs内合并最新

1 个答案: