react-redux中多個action和reducer是如何關(guān)聯(lián)的

如題，存在多個action和多個reducer，使用combineReducers()合并多個reducer后，怎么知道store派發(fā)的action是由哪個reducer處理，根據(jù)什么進行判定的？

回答

編輯回答

命于你

目錄結(jié)構(gòu)

Action整合

actions目錄中的index.js作為所有業(yè)務(wù)的集合,集中配置管理.

actions/index.js

import * as officeActions from './office';
import * as userActions from './user';

export default {
    ...officeActions,
    ...userActions,
}

actions/office.js

//這里的方法名稱要全局唯一
export function getOfficeList(){
    return async(dispatch,getState) => {
        let response = await fetch(url);
        //這里的type一定要全局唯一,因為狀態(tài)變一次每個Reducer都會根據(jù)類型比對一遍
        dispatch({type: 'GET_OFFICE_LIST', payLoad: response.json});
    }
}
export function getOfficeInfo(id){
    return async(dispatch,getState) => {
        let response = await fetch(url+'?id='+id);
        //這里的type一定要全局唯一,因為狀態(tài)變一次每個Reducer都會根據(jù)類型比對一遍
        dispatch({type: 'GET_OFFICE_DETAIL', payLoad: response.json});
    }
}

actions/user.js

//這里的方法名稱要全局唯一
export function getUserList(){
    return async(dispatch,getState) => {
        let response = await fetch(url);
        //這里的type一定要全局唯一,因為狀態(tài)變一次每個Reducer都會根據(jù)類型比對一遍
        dispatch({type: 'GET_USER_LIST', payLoad: response.json});
    }
}

Reducer整合

Reducer目錄中的index.js 所有子狀態(tài)的集合,集中配置管理.

reducers/index.js

import {combineReducers} from 'redux';

import officeReducer from './office';
import userReducer from './user';

const appReducer = combineReducers({
    office: officeReducer,
    user: userReducer,
});
export default appReducer;

reducers/office.js

//初始化狀態(tài)
let initialState = {
    officeList: [],
    officeInfo: {
        "id": "",
        "parent_id": "",
        "parent_ids": "",
        "name": "",
    },
};
const office = (state = initialState, action) => {
    switch (action.type) {
        //處理 類型為 GET_OFFICE_LIST 結(jié)果數(shù)據(jù)
        case 'GET_OFFICE_LIST':
            return Object.assign({}, state, {
                officeList: action.payLoad.data
            });
        //處理 類型為 GET_OFFICE_DETAIL 結(jié)果數(shù)據(jù)
        case 'GET_OFFICE_DETAIL':
            return Object.assign({}, state, {
                officeInfo: action.payLoad.data
            });
        default:
        //如果類型為匹配到 返回當前state
            return state;
    }
};
export default office

最終使用

pages/office.js

import React, {Component} from 'react'
import {bindActionCreators} from 'redux';
import {connect} from 'react-redux';

//以antd為例
import {Table, Tree, Row, Col, Card, Button, Spin, Modal,Icon} from 'antd';
//引入Action集合,因為很有可能某個頁面 需要調(diào)用多個子action
import Actions from '../actions';

class office extends Component {
    //生命周期此次不討論
    componentDidMount() {
        //請求機構(gòu) 數(shù)據(jù)
        this.props.action.getOfficeList();
  }

    handleOnRowClick = (officeId)=>{
        //點擊行 獲取結(jié)構(gòu)詳情數(shù)據(jù)
        this.props.action.getOfficeInfo(officeId);
    }
    
    render() {
        <div className="tableDistance">
        <Table rowSelection={rowSelection} columns={columns}
               dataSource={this.props.office.officeList}//綁定機構(gòu)數(shù)據(jù)并展現(xiàn)
               bordered size="middle"
               pagination={false} onRowClick={this.handleOnRowClick}
        />
    </div>
    }

}
//我習慣叫訂閱-訂閱Reducer/index.js集合中的需要的狀態(tài),reducer/office在這里進行綁定(數(shù)據(jù)結(jié)構(gòu)具體見:initState),reducer/office數(shù)據(jù)變化這里就會變化,這里可以理解為數(shù)據(jù)源
const mapStateToProps = (state) => {
    return {
        office: state.office,
        user:state.user
    }
};
//將引入的Actions綁定,使當前展現(xiàn)層具備 請求數(shù)據(jù)的能力,需要什么數(shù)據(jù),就請求對應(yīng)的 方法名(這就是為什么腔調(diào)actions/office.js 中的每個action 名稱一定要全局唯一,還是那句話,這個頁面可能需要多個子action的數(shù)據(jù)能力作為數(shù)據(jù)集中展現(xiàn)的基礎(chǔ))
const mapDispatchToProps = (dispatch) => {
    return {
        action: bindActionCreators(Actions, dispatch)
    }
};
//最重要一步 通過react-redux 提供的 connect函數(shù)將 需要的 Reducer和Actions 綁定至 當前頁面
export default connect(mapStateToProps, mapDispatchToProps)(office);