React Native-Redux Error: undefined is not an object(evaluating

Question

我收到错误消息

"undefined is not an object(evaluating 'CategoryAction2.default.categoryView')" on executing the below code,

ConfigureStore.js:

import {createStore, applyMiddleware} from 'redux';
import reducers from '../reducers';
import thunk from 'redux-thunk';

var middlewares = applyMiddleware(thunk);

export default function configureStore(initialState) {
  return createStore(reducers, initialState, middlewares);
}

CategoryContainer.js:

import React, { Component } from 'react';
import stores from '../stores/ConfigureStore';
import CategoryAction from '../actions/CategoryAction';

stores.dispatch(CategoryAction.categoryView());

class CategoryContainer extends Component {
}

CategoryAction.js

import * as actionTypes from './ActionTypes';
import AppConstants from '../constants/AppConstants';

export function categoryView() {
  const categories = ['Health', 'Built-in'];
  return {
      type: "CATEGORY_VIEW",
      categories: categories
  };
}

CategoryReducer.js:

const initialState = {
  categories:[],
}

export default function categoryReducer (state = initialState, action) {
  switch (action.type) {
    case CATEGORY_VIEW:
      return Object.assign({}, state, {
              categories: action.categories
            });
    }
}

CategoryContainer.js 中的下一行引发了错误消息， stores.dispatch(CategoryAction.categoryView());

请协助解决问题。

Answer 1

在CategoryContainer.js中，您需要导入CategoryActions.js的特定成员（或所有成员）。应该是以下两个选项之一：

import * as CategoryAction from '../actions/CategoryAction';

// or

import { categoryView } from '../actions/CategoryAction';
stores.dispatch(categoryView());

React Native-Redux Error: undefined is not an object(evaluating

React Native-Redux Error: undefined is not an object(evaluating

react-native

react-redux