reactjs - React Redux 加载栏未显示

Question

我在使用 React Redux 加载栏时遇到问题。它没有显示。我在根 reducer 中使用不可变的 js、redux 不可变库。我没有收到任何错误。如果我检查元素树，就会发现只有一个空 div。我在这里犯了什么错误

index.js

import { ImmutableLoadingBar as LoadingBar} from 'react-redux-loading-bar'

class Header extends React.Component {
render() {
return (
  <header>
    <LoadingBar />
  </header>
)
}
}

reducer.js

import { combineReducers } from 'redux-immutable';
import { loadingBarReducer } from 'react-redux-loading-bar'

export function rootReducer(state = routeInitialState, action) {
switch (action.type) {

case LOCATION_CHANGE:
  return state.merge({
    location: action.payload,
  });
default:
  return state;
  }
}
export default function createReducer(injectedReducers) {
  return combineReducers({
    route: rootReducer,
    language: languageProviderReducer,
    loadingBar: loadingBarReducer,
    ...injectedReducers,
   });
   }

store.js

import { createStore, applyMiddleware, compose } from 'redux';
import { routerMiddleware } from 'react-router-redux';
import createSagaMiddleware from 'redux-saga';
import createReducer from './reducers';
import { loadingBarMiddleware } from 'react-redux-loading-bar'

export default function configureStore(initialState = {}, history) {
 const middlewares = 
  [sagaMiddleware,routerMiddleware(history),loadingBarMiddleware()];

 const enhancers = [applyMiddleware(...middlewares)];


 const composeEnhancers =
process.env.NODE_ENV !== 'production' &&
typeof window === 'object' &&
window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__
  ? window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__({
      shouldHotReload: false,
    })
  : compose;

 const store = createStore(
    createReducer(),
    fromJS(initialState),
    composeEnhancers(...enhancers),
  );

 store.runSaga = sagaMiddleware.run;

Answer 1

我有类似的问题，但我没有使用immutable-js。不过，无论如何，我想发布我的解决方案，也许它会对某人有所帮助:)

所以我按照 npm-page 上的说明做了所有事情，但我错过了一个小细节:react-redux-loading-bar 导出连接的容器“LoadingBar”和 LoadingBar 组件本身。 (参见https://github.com/mironov/react-redux-loading-bar/issues/79#issuecomment-441355249)

因此请确保导入连接的容器(LoadingBar 周围没有大括号):

import LoadingBar from 'react-redux-loading-bar'

这对许多人来说可能是微不足道的，但也许会对某人有所帮助。