减速器没有捕捉到 LOCATION_CHANGE 动作答案

【问题标题】：Reducer not catching LOCATION_CHANGE action减速器没有捕捉到 LOCATION_CHANGE 动作
【发布时间】：2016-12-12 14:22:53
【问题描述】：

我正在努力让我的 React/Redux 应用根据操作更新 URL。我已经环顾四周了。我以为我已经掌握了它，但显然我错过了一些东西。我还有其他可以正确响应的减速器。

目前，我只是在尝试记录操作。

路由缩减器

const initialState = { locationBeforeTransitions: null };

export default function routing(state = initialState, action)
{
  switch (action.type)
  {
    case 'LOCATION_CHANGE':
      console.log(action)

    default:
      return state

  }

}

商店

/*
  Things from other people
 */

import { createStore, applyMiddleware, compose } from 'redux'
import { syncHistoryWithStore }                  from 'react-router-redux';
import { browserHistory }                        from 'react-router'
import   thunkMiddleware                         from 'redux-thunk'
import   createLogger                            from 'redux-logger'

/*
  Things from us
 */

import { fetchSuitesAndFails, fetchResults } from './actions/actions';
import   rootReducer                         from './reducers/index'

const enhancers = compose(
  window.devToolsExtension ? window.devToolsExtension() : f => f
);

const loggerMiddleware = createLogger()

/*
  Store
*/

export const store = createStore(
  rootReducer,
  enhancers,
  applyMiddleware(
    thunkMiddleware, // lets us dispatch() functions
    loggerMiddleware // neat middleware that logs actions
  )
);

// Export the history so we can keep track of things
export const history = syncHistoryWithStore(browserHistory, store);


/*
  Enable Hot Reloading for the reducers
  We re-require() the reducers whenever any new code has been written.
  Webpack will handle the rest
*/

if (module.hot) {
  // Enable Webpack hot module replacement for reducers
  module.hot.accept('./reducers/index', () => {
    const nextRootReducer = require('./reducers/index').default
    store.replaceReducer(nextRootReducer)
  })
}

索引

/*
  React router needs
*/
import { combineReducers } from 'redux'
import { routerReducer }   from 'react-router-redux'

/*
  Reducers
*/
import suite          from './suite'
import suitesandfails from './suitesandfails'
import routing        from './routing'


/*
  Put them all together and return a single reducer
*/
const rootReducer = combineReducers({
  suite,
  suitesandfails,
  routing,
  routing: routerReducer
})

export default rootReducer

【问题讨论】：

你给rootReducer添加路由了吗？
我做到了。我更新为显示。
什么代码在调度这个动作？减速器之前可能存在错误。
我从来没有将两个 reducer 分配给 combineReducers 中的同一个属性。由于双重分配，第一个减速器没有被调用吗？不过不确定。
React-router-redux 调度操作。它显示在开发工具中。

标签： javascript reactjs redux react-router react-router-redux

【解决方案1】：

您可以使用字符串 "@@router/LOCATION_CHANGE" 来捕捉动作。

react-router-redux 为此提供了 const

import { LOCATION_CHANGE } from 'react-router-redux'

....
case LOCATION_CHANGE:
      console.warn('LOCATION_CHANGE from your reducer',action)
      return state

webpackbin DEMO

routerReducer code from react-router-redux

【讨论】：

【解决方案2】：

您也可以从'react-router-redux' 导入常量。

import { LOCATION_CHANGE } from 'react-router-redux'
 ...
 case LOCATION_CHANGE:
     console.warn('LOCATION_CHANGE from your reducer',action)
     return state

【讨论】：