Redux - mapDispatchToProps 不适用于注销功能

Question

在我的应用程序中，我有一个注销按钮，但它不会将您注销。我检查了减速器和动作，它们看起来还不错，因为我有另一个类似的应用程序，它在那里工作。

这是导入注销操作的“Nav.jsx”组件。

import React from 'react'
import {connect} from 'react-redux'
import {Link} from 'react-router-dom'
import {logoutUser} from '../actions/logout'

class Nav extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      showBurger: false,
      loggedOut: false
    }
    this.toggleBurger = this.toggleBurger.bind(this)
    this.logout = this.logout.bind(this)
  }
  toggleBurger() {
    this.setState({showBurger: !this.state.showBurger})
  }

  logout () {
    this.props.dispatch(logoutUser())
    this.setState({loggedOut: true})
  }

  render() {
    //
    const {auth} = this.props
    const {showBurger} = this.state
    const {loggedOut} = this.state
    console.log("is this logout?", this.logout.bind(this))

    return <nav className="navbar">
      <div className="container">
        <div className="navbar-brand">
          <span onClick={this.toggleBurger} className={`navbar-burger burger ${showBurger ? 'is-active': ''}`} data-target="navbarMenuHeroA">
            <span></span>
            <span></span>
            <span></span>
          </span>
        </div>
        <div id="navbarMenuHeroA" className={`navbar-menu ${showBurger ? "is-active" : ''}`}>
          <div className="navbar-end">
            <Link onClick={this.toggleBurget} className="navbar-item" to='/found'>Found</Link>
            <Link onClick={this.toggleBurget} className="navbar-item" to='/lost'>Lost</Link>
            {auth.isAuthenticated
              ? <span>
                <Link onClick={this.toggleBurget} className="navbar-item" to='/foundform'>Foundform</Link>
                <Link onClick={this.toggleBurget} className="navbar-item" to='/lostform'>Lostform</Link>
                <Link to="/" onClick={() => this.logout.bind(this)} className="navbar-item">Logout</Link>
              </span>
              : [
                <Link onClick={this.toggleBurger} className="navbar-item is-large" to='/login'>Login</Link>,
                <Link onClick={this.toggleBurger} className="navbar-item" to='/register'>Register</Link>,
              ]
            }
          </div>
        </div>
      </div>
    </nav>
  }
}

const mapDispatchToProps = (dispatch) => {
  return {
    logout: () => dispatch(logoutUser())
  }
}

const mapStateToProps = ({auth}) => {
  return {auth}
}

export default connect(mapStateToProps, mapDispatchToProps)(Nav)

当我运行这个时，console.log 给我“这是注销吗？ƒ () { [native code] }”，我也收到这个警告：“哈希历史不能推送相同的路径；新条目不会被添加到历史堆栈”。这是一个我现在自己在做的小组项目，我不知道到底出了什么问题？请帮忙。

如果有帮助，这里是注销操作。

   import { removeUser } from '../utils/auth'
    function requestLogout () {
      return {
        type: 'LOGOUT_REQUEST',
        isFetching: true,
        isAuthenticated: true
      }
    }

    function receiveLogout () {
      return {
        type: 'LOGOUT_SUCCESS',
        isFetching: false,
        isAuthenticated: false
      }
    }

    // Logs the user out
    export function logoutUser () {
      return dispatch => {
        document.location = "/#/"
        dispatch(requestLogout())
        removeUser()
        dispatch(receiveLogout())
      }
    }

这里还有一些来自应用程序的文件。这是 reducers 文件夹中的 auth.js。

import { isAuthenticated, getUserTokenInfo } from '../utils/auth'

const initialState = {
  isFetching: false,
  isAuthenticated: isAuthenticated(),
  user: getUserTokenInfo(),
  errorMessage: ''
}

export default function auth (state = initialState, action) {
  switch (action.type) {
    case 'LOGIN_REQUEST':
      return {
        ...state,
        isFetching: true,
        isAuthenticated: false,
        errorMessage: ''
      }
    case 'LOGIN_SUCCESS':
      return {
        ...state,
        isFetching: false,
        isAuthenticated: true,
        user: action.user
      }
    case 'LOGIN_FAILURE':
      return {
        ...state,
        isFetching: false,
        isAuthenticated: false,
        errorMessage: action.message
      }
    case 'LOGOUT_SUCCESS':
      return {
        ...state,
        isFetching: false,
        isAuthenticated: false,
        user: null
      }
    case 'REGISTER_REQUEST':
      return {
        ...state,
        isFetching: true,
        isAuthenticated: false,
        errorMessage: ''
      }
    case 'REGISTER_FAILURE':
      return {
        ...state,
        isFetching: false,
        isAuthenticated: false,
        errorMessage: action.message
      }
    default:
      return state
  }
}

还有结合reducer 的index.js。

从“redux”导入 {combineReducers}

import auth from './auth'
import lostPets from './lostPets'
import found from './foundPets'

export default combineReducers({
  auth,
  found,
  lostPets
})

Answer 1

因为你已经在使用mapDispatchToProps，所以你需要直接调用该函数而不是使用dispatch，如果你不提供mapDispatchToProps，dispatch将提供给组件

import React from 'react'
import {connect} from 'react-redux'
import {Link} from 'react-router-dom'
import {logoutUser} from '../actions/logout'

class Nav extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      showBurger: false,
      loggedOut: false
    }
    this.toggleBurger = this.toggleBurger.bind(this)
    this.logout = this.logout.bind(this)
  }
  toggleBurger() {
    this.setState({showBurger: !this.state.showBurger})
  }

  logout () {
    this.props.logout() // call logout here from props
    this.setState({loggedOut: true})
  }

  render() {
    //
    const {auth} = this.props
    const {showBurger} = this.state
    const {loggedOut} = this.state
    console.log("is this logout?", this.logout.bind(this))

    return <nav className="navbar">
      <div className="container">
        <div className="navbar-brand">
          <span onClick={this.toggleBurger} className={`navbar-burger burger ${showBurger ? 'is-active': ''}`} data-target="navbarMenuHeroA">
            <span></span>
            <span></span>
            <span></span>
          </span>
        </div>
        <div id="navbarMenuHeroA" className={`navbar-menu ${showBurger ? "is-active" : ''}`}>
          <div className="navbar-end">
            <Link onClick={this.toggleBurget} className="navbar-item" to='/found'>Found</Link>
            <Link onClick={this.toggleBurget} className="navbar-item" to='/lost'>Lost</Link>
            {auth.isAuthenticated
              ? <span>
                <Link onClick={this.toggleBurget} className="navbar-item" to='/foundform'>Foundform</Link>
                <Link onClick={this.toggleBurget} className="navbar-item" to='/lostform'>Lostform</Link>
                <Link to="/" onClick={() => this.logout.bind(this)} className="navbar-item">Logout</Link>
              </span>
              : [
                <Link onClick={this.toggleBurger} className="navbar-item is-large" to='/login'>Login</Link>,
                <Link onClick={this.toggleBurger} className="navbar-item" to='/register'>Register</Link>,
              ]
            }
          </div>
        </div>
      </div>
    </nav>
  }
}

const mapDispatchToProps = (dispatch) => {
  return {
    logout: () => dispatch(logoutUser())
  }
}

const mapStateToProps = ({auth}) => {
  return {auth}
}

export default connect(mapStateToProps, mapDispatchToProps)(Nav)

Answer 2

我很困惑为什么您同时使用组件状态和 redux 状态来跟踪用户是否已注销。无论如何，您将 dispatch 传递给 mapDispatchToProps，并且应该使用 dispatch() 将您在 mapDispatchToProps 中定义的函数包装起来，以便将它们发送给调度程序：

const mapDispatchToProps = dispatch => ({
  logout: () => dispatch(logoutUser())
})

使用这种模式可以让您将所有调度调用集中在mapDispatchToProps 中。

完整的减速器（我将状态初始化为已登录，因为我无权访问您实际验证用户的身份验证模块）：

const initialState = {
  isAuthenticated: true,
  isFetching: false,
}

const logoutReducer = (state = initialState, action) => {
  switch (action.type) {
    case 'LOGOUT_REQUEST':
      return Object.assign({}, state, {
        isFetching: true,
      })
    case 'LOGOUT_SUCCESS':
      return Object.assign({}, state, {
        isFetching: false,
        isAuthenticated: false,
      })
    default:
      return state;
  }
}

export default logoutReducer;

Reducer 安装在身份验证状态：

import { combineReducers } from 'redux';
import logoutReducer from './logoutReducer';

export const rootReducer = combineReducers({
  auth: logoutReducer,
});

完全注销操作：

const requestLogout = () => ({
  type: 'LOGOUT_REQUEST',
  isFetching: true,
  isAuthenticated: true
})

const receiveLogout = () => ({
  type: 'LOGOUT_SUCCESS',
  isFetching: false,
  isAuthenticated: false
})

export const logoutUser = () => {
  return dispatch => {
    document.location = "/#/"
    dispatch(requestLogout())
    //removeUser()
    dispatch(receiveLogout())
  }
}

完整组件：

import React from 'react'
import {connect} from 'react-redux'
import {Link} from 'react-router-dom'
import {logoutUser} from '../actions/logout'

class Nav extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      showBurger: true,
      loggedOut: false
    }
    this.toggleBurger = this.toggleBurger.bind(this)
    this.logout = this.logout.bind(this)
  }
  toggleBurger() {
    this.setState({showBurger: !this.state.showBurger})
  }

  logout () {
    console.log('logging out')
    this.props.logout()
    this.setState({loggedOut: true})
  }

  render() {
    //
    const {auth} = this.props
    const {loggedOut} = this.state
    console.log('is this logout?', this.logout)

    return <nav className='navbar'>
      <div className='container'>
        <div className='navbar-brand' style={{
            height: '40px',
            width: '40px',
            background: 'red',
          }}>
          <span onClick={this.toggleBurger}
            className={
              `navbar-burger burger ${this.state.showBurger ? 'is-active': ''}`
            } data-target='navbarMenuHeroA'>
            <span></span>
            <span></span>
            <span></span>
          </span>
        </div>
        <div id='navbarMenuHeroA' 
          className={
            `navbar-menu ${this.state.showBurger ? 'is-active' : ''}`
          }>
          <div className='navbar-end'>
            <Link onClick={this.toggleBurger}
              className='navbar-item'
              to='/found'>Found</Link>
            <Link onClick={this.toggleBurger}
              className='navbar-item'
              to='/lost'>Lost</Link>
            {auth.isAuthenticated
              ? <span>
                <Link onClick={this.toggleBurger}
                  className='navbar-item'
                  to='/foundform'>Foundform</Link>
                <Link onClick={this.toggleBurger}
                  className='navbar-item'
                  to='/lostform'>Lostform</Link>
                <Link onClick={this.logout}
                  className='navbar-item'
                  to='/'>Logout</Link>
              </span>
              : [
                <Link onClick={this.toggleBurger}
                  className='navbar-item is-large'
                  to='/login'>Login</Link>,
                <Link onClick={this.toggleBurger}
                  className='navbar-item'
                  to='/register'>Register</Link>,
              ]
            }
          </div>
        </div>
      </div>
    </nav>
  }
}

const mapDispatchToProps = dispatch => ({
  logout: () => dispatch(logoutUser())
})

const mapStateToProps = state => ({
  auth: state.auth,
})

export default connect(mapStateToProps, mapDispatchToProps)(Nav)

我认为在继续或在 StackOverflow 上提问之前，您需要大大简化。用一个 div 制作一个简单的组件应用程序，允许用户单击登录和单击注销。然后一一介绍元素。当您遇到困难时，将应用程序削减到其对问题的绝对最小可行表达，并将其作为问题发布在这里，人们会很乐意提供帮助...