如何在多个组件中共享redux store

Question

嗨,我有一个组件,我在我的反应应用程序中集成了redux.我打开第二个然后是第三个组件.我不希望将我在第一个组件中获得的数据传递给道具中的第二个然后第三个.

我想使用redux store来做到这一点.有没有办法做到这一点？

App.js

import React, { Component } from "react";
import logo from "./logo.svg";
import "./App.css";
import RoundedButton from "./RoundedButton";
import { connect } from "react-redux";
import { bindActionCreators } from "redux";
import * as actions from "./actions/index";

class App extends Component {
  constructor(props) {
    super(props);
    this.state = {
      score: 0,
      status: "",
      userSelected: "",
      computerSelected: "",
      visibility: [true, true, true],
      buttonVisibility: false
    };
    this.clickitem = this.clickitem.bind(this);
    this.handlePlayAgain = this.handlePlayAgain.bind(this);
  }

  handlePlayAgain() {
    this.setState({
      buttonVisibility: false,
      visibility: [true, true, true]
    });
  }

  clickitem(user) {
    var url = "http://localhost:4000/generate-random";
    this.setState({ userSelected: user });

    fetch(url)
      .then(response => {
        if (response.status >= 400) {
          throw new Error("Bad response from server");
        }
        return response.json();
      })
      .then(data => {
        var computer = data.item;
        this.setState({ computerSelected: computer });
        if (
          (user === "Rock" && computer === "Scissors") ||
          (user === "Paper" && computer === "Rock") ||
          (user === "Scissors" && computer === "Paper")
        ) {
          this.props.increment();
        } else if (user === computer) {
          this.props.doNothing();
        } else {
          this.props.decrement();
        }

        console.log(user + " " + computer);
        console.log("------------------------------------");

        App.contextTypes = { store: React.PropTypes.object };
        let store = this.context.store;
        console.log(store);

        arrayvar = [];

        var arrayvar = [];
        if (user === "Rock" && computer === "Rock") {
          arrayvar = [true, false, false];
        } else if (user === "Paper" && computer === "Paper") {
          arrayvar = [false, true, false];
        } else if (user === "Scissors" && computer === "Scissors") {
          arrayvar = [false, false, true];
        } else if (
          (user === "Rock" && computer === "Paper") ||
          (user === "Paper" && computer === "Rock")
        ) {
          arrayvar = [true, true, false];
        } else if (
          (user === "Rock" && computer === "Scissors") ||
          (user === "Scissors" || computer === "Rock")
        ) {
          arrayvar = [true, false, true];
        } else if (
          (user === "Paper" && computer === "Scissors") ||
          (user === "Scissors" || computer === "Paper")
        ) {
          arrayvar = [false, true, true];
        }
        this.setState({ visibility: arrayvar });
        this.setState({
          buttonVisibility: true
        });
      });
  }

  render() {
    return (
      <div className="CenterDiv">
        <div className="AppTitle">
          <b>Score: {this.props.score}</b>
          <div>
            {this.state.visibility[0]
              ? <RoundedButton
                  text="Rock"
                  clickitem={this.clickitem}
                  label={
                    this.state.userSelected === "Rock" &&
                      this.state.computerSelected === "Rock"
                      ? "User & Computer Selected"
                      : this.state.userSelected === "Rock"
                        ? "User Selected"
                        : this.state.computerSelected === "Rock"
                          ? "Computer Selected"
                          : ""
                  }
                />
              : null}
            {this.state.visibility[1]
              ? <RoundedButton
                  text="Paper"
                  clickitem={this.clickitem}
                  label={
                    this.state.userSelected === "Paper" &&
                      this.state.computerSelected === "Paper"
                      ? "User & Computer Selected"
                      : this.state.userSelected == "Paper"
                        ? "User Selected"
                        : this.state.computerSelected === "Paper"
                          ? "Computer Selected"
                          : ""
                  }
                />
              : null}
            {this.state.visibility[2]
              ? <RoundedButton
                  text="Scissors"
                  clickitem={this.clickitem}
                  label={
                    this.state.userSelected === "Scissors" &&
                      this.state.computerSelected === "Scissors"
                      ? "User & Computer Selected"
                      : this.state.userSelected === "Scissors"
                        ? "User Selected"
                        : this.state.computerSelected === "Scissors"
                          ? "Computer Selected"
                          : ""
                  }
                />
              : null}
          </div>

          <div className="Status">{this.props.status}</div>

          {this.state.buttonVisibility
            ? <button onClick={this.handlePlayAgain} style={{ margin: 30 }}>
                Play Again
              </button>
            : null}

        </div>
      </div>
    );
  }
}

function mapStateToProps(state) {
  return { score: state.score, status: state.status };
}

export default connect(mapStateToProps, actions)(App);

index.js

import React from "react";
import ReactDOM from "react-dom";
import App from "./App";
import registerServiceWorker from "./registerServiceWorker";
import "./index.css";

import { Provider } from "react-redux";
import { createStore } from "redux";
import scoreReducer from "./reducers";

let store = createStore(scoreReducer);

ReactDOM.render(
  <Provider store={store}><App /></Provider>,
  document.getElementById("root")
);
registerServiceWorker();

secondcomponent.js

export default class SecondComponent extends Component {
  render() {
    return (
       // print score which is in redux
    );
  }
}

第三个组件.js

export default class ThirdComponent extends Component {
  render() {
    return (
       // print score which is in redux
    );
  }
}

什么方式可以在多个组件中访问redux存储？

Answer 1

包装的任何组件connect:

connect(mapStateToProps, actions)(AnyComponent);

将有权访问整个 redux商店.
随着mapStateToProps您可以从刚刚通过的相关数据块的redux存储区,经由连接的组件props.

关于组件内部state,我的经验法则是仅针对与特定组件相关的数据设置内部状态.
例如,extend或collapse下拉状态.

对于ajax请求,如果您已经使用redux我强烈建议使用thunks或使用操作sagas并通过redux流传递新获取的数据:
Action/thunk - > Reducers - > connected components.

编辑
作为评论的后续内容,
您不需要传递要连接到提供程序的每个组件,只需传递根组件(App在您的情况下),并且每个子组件App可以redux在必要时连接到:

class SecondComponent extends Component {
  render() {
    return (
       // print score which is in redux
       <div>this.props.score</div> 
    );
  }
} 

export default connect(mapStateToProps)(SecondComponent);

以及其他组件:

class ThirdComponent extends Component {
  render() {
    return (
       // print score which is in redux
       <div>this.props.score</div> 
    );
  }
} 

export default connect(mapStateToProps)(ThirdComponent);

编辑#2
作为您的其他评论的后续内容:

所以将道具中的值传递给组件或使用上述方法,建议使用Idk吗？

尽可能避免连接组件并将道具传递给孩子,主要原因是为了防止依赖redux.
我更喜欢尽可能让我的组件"哑",让他们只关注事物的外观.
我确实有一些关于事情应该如何工作的组件,这些组件主要处理逻辑并将数据传递给子节点,它们是我经常连接的组件.

当我注意到我的应用程序正在缩放并且我的一些组件充当道具的代理时(我甚至得到了一个词!"Propxy"),那就是他们从父母那里得到道具并将它们传递下来而不使用它们,我通常在组件树的中间注入一个连接组件,这样我就可以让树下流动的"propxy"组件更加轻盈和纤细.