Question

正如标题所示，我正努力让我的Redux状态使用reducer进行更新。我也在使用Redux和React。在这种情况下，我使用Redux状态来保存用户是否使用JWT令牌登录的布尔值。我确信我已正确设置了Reducer，因为我可以控制注销掉初始验证状态，默认情况下设置为false。但是当我运行AUTH_USER操作告诉reducer更新状态以使authenticated = true时，没有任何反应。当记录auth的redux状态时，即使我已经为AUTH_USER运行了该操作，它仍然是假的。它似乎正确地进入reducer中的switch语句，因为console.log显示在终端中。我从头部组件的componentDidMount生命周期方法获取控制台日志，该方法呈现在我的React应用程序的每个部分。

Reducers的Index.js（/src/reducers/index.js）

import { combineReducers } from 'redux';
import authReducer from './reducer_auth';

const rootReducer = combineReducers({
  auth: authReducer
});

export default rootReducer;

身份验证Reducer（/src/reducers/reducer_auth.js）

import { AUTH_USER, DEAUTH_USER } from '../actions/types';

export default function (state = { authenticated: false, error: "" }, 
action) {
  switch(action.type) {
    case AUTH_USER:
      console.log('THIS DOES SHOW UP IN CONSOLE')
      return {...state, error: "", authenticated: true };
    case DEAUTH_USER:
      return {...state, error: "", authenticated: false };
    default:
      return state;
  }
}

用于登录的Action Creator（/src/actions/index.js）

import axios from 'axios';
import history from '../utils/historyUtils';

import { AUTH_USER, DEAUTH_USER } from './types';

const ROOT_URL = 'http://localhost:8888';

export function signInUser(username, password) {
  const signInRequest = axios.post(`${ROOT_URL}/wp-json/jwt-auth/v1/token`, {
    "username": username,
    "password": password
  });

  return (dispatch) => {
    return signInRequest.then(response => {
      localStorage.setItem('token', JSON.stringify(response.data.token));

      dispatch({
        type: AUTH_USER,
        payload: { authenticated : true }
      })

      history.push('/');
      history.go();
    })
  }
}

标题组件（/src/containers/header.js）

import React, { Component } from 'react';
import { Link } from 'react-router-dom';
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
import { signOutUser } from '../actions';

import '../styles/header.css';

class Header extends Component {
  componentDidMount() {
    console.log('authenticated from header: ', this.props.authenticated)
  }

  handleLogout(event) {
    event.preventDefault();
    localStorage.removeItem('token');

  }

  render() {
    return (
      <div className="container">
        <header>
          <div id="branding">
            <h1><Link to="/">INSERT BRAND HERE</Link></h1>
          </div>
          <nav>
            <ul>
              <li><Link to="/">Home</Link></li>
              <li><Link to="/contact">Contact</Link></li>
              <li><Link to="/services">Services</Link></li>
              <li><Link to="/Portfolio">Portfolio</Link></li>
              <li><Link to="/about">About</Link></li>
              <li><Link to="/blog">Blog</Link></li>
              {/* {this.props.authenticated ? <li>Logout</li> : <li><Link to="/signin">Login</Link></li>} */}
              <li><Link to="/signin">Login</Link></li>
            </ul>
          </nav>
        </header>
      </div>
    );
  }
}

function mapStateToProps(state) {
  return {
    authenticated: state.auth
  }
}

function mapDispatchToProps(dispatch) {
  return bindActionCreators({
    signOutUser
  }, dispatch);
}

export default connect(mapStateToProps, mapDispatchToProps)(Header);

保存路由的Index.js（/src/index.js）

import React from 'react';
import { BrowserRouter, Route, Switch } from 'react-router-dom';
import ReactDOM from 'react-dom';
import { createStore, applyMiddleware } from 'redux';
import { Provider } from 'react-redux';
import reduxThunk from 'redux-thunk';

import reducers from './reducers';
import Home from './components/home';
import About from './components/about';
import Blog from './containers/blog';
import Contact from './components/contact';
import Portfolio from './components/portfolio';
import Services from './components/services';
import registerServiceWorker from './registerServiceWorker';
import SignIn from './containers/signIn_form';

const createStoreWithMiddleware = applyMiddleware(reduxThunk)(createStore);

ReactDOM.render(
  <Provider store={createStoreWithMiddleware(reducers)}>
    <BrowserRouter>
      <div>
        <Switch>
          <Route path="/about" component={About} />
          <Route path="/blog" component={Blog} />
          <Route path="/contact" component={Contact} />
          <Route path="/portfolio" component={Portfolio} />
          <Route path="/services" component={Services} />
          <Route path="/signin" component={SignIn} />
          <Route path="/" component={Home} />
        </Switch>
      </div>
    </BrowserRouter>
  </Provider>
, document.getElementById('root'));
registerServiceWorker();

如果有人能帮助解决这个问题，我将非常感激！

Answer 1

感谢大家的评论，你们都很棒！它帮助我意识到我在动作创建者中用于编程导航的历史npm模块由于某种原因重置了我的redux状态（如果有人好奇，这里是历史模块的github的链接：https://github.com/ReactTraining/history）。从我的应用程序中删除模块后，redux状态现在更新并保持按预期更新。

Redux（带React）Reducer switch语句NOT update State

1 个答案: