减速器无法在Redux中执行操作

时间:2020-02-25 17:59:18

标签: javascript reactjs redux

我正在尝试在我的react项目中实现redux,但似乎无法解决遇到的这个问题。当我单击提交按钮时,我正在向我的减速器发出调度动作,在这种情况下,应该将道具“ loading”设置为true。我知道该操作被正确调用,因为在调用该操作时它将记录到控制台,但是没有来自reducer的日志(我已经将reducer编码为在调用它时进行记录)。但是,我可以看到以前的reducer在设置中被调用(初始调用等)。 这是我目前正在使用的我的减速器代码:

import { ADD_PRODUCT_STARTED, ADD_PRODUCT_SUCCESS, ADD_PRODUCT_FAILURE } from '../actions/types'

const initialState = {
    products: [
        {
            name: 'Friends t-shirt',
            price: '50',
            img: 'https://static.bershka.net/4/photos2/2019/I/0/1/p/7337/058/250/7337058250_1_1_3.jpg',
            id: 1
        },
        {
            name: 'Computer',
            price: '50',
            img: 'https://cdn.def-shop.com/cdn-cgi/image/w=530,q=95,f=auto/images/product_images/picture1300x1725_images/619532_0.jpg',
            id: 2
        },
        {
            name: 'IPhone',
            price: '50',
            img: 'https://cdn.def-shop.com/cdn-cgi/image/w=530,q=95,f=auto/images/product_images/picture1300x1725_images/619532_0.jpg',
            id: 3
        }
    ],
    loading: false,
    error: null
};

const productsReducer = (state = initialState, action) => {
    console.log(action.type, ADD_PRODUCT_STARTED)
    switch (action.type) {
        case ADD_PRODUCT_STARTED:
            console.log('Reducing started...')
            return {
                ...state,
                loading: true
            };
        case ADD_PRODUCT_SUCCESS:
            return {
                ...state,
                loading: false,
                error: null,
                todos: [...state.todos, action.payload]
            };
        case ADD_PRODUCT_FAILURE:
            return {
                ...state,
                loading: false,
                error: action.payload.error
            };
        default:
            return state;
    }
}

export default productsReducer

这是动作代码

import { ADD_PRODUCT_STARTED, ADD_PRODUCT_SUCCESS, ADD_PRODUCT_FAILURE } from './types'

const addProduct = (name, price) => {
    return dispatch => {
        console.log('Dispatching action...')
        dispatch(addProductStarted)
        console.log(`Action dispatched: ${addProductStarted}`)


        // Perform actions here then: .then() => dispatch(addProductSuccess) and .catch() => dispatch(addProductFailure)
    }


}

const addProductStarted = () => {
    return {
        type: ADD_PRODUCT_STARTED
    }
}

const addProductSuccess = (product) => {
    return {
        type: ADD_PRODUCT_STARTED,
        payload: {
            ...product
        }
    }
}

const addProductFailure= (err) => {
    return {
        type: ADD_PRODUCT_STARTED,
        payload: {
            ...err
        }

    }
}

if(ADD_PRODUCT_SUCCESS && ADD_PRODUCT_FAILURE && addProductSuccess && addProductFailure){
    console.log('Ignore thihihi')
}



export default addProduct

谢谢您的帮助,因为我真的为此感到困惑!

1 个答案:

答案 0 :(得分:3)

您实际上并不是在分派动作。

此行是错误的:

dispatch(addProductStarted)

请记住,调度涉及将 action对象传递给dispatch,例如:

dispatch({type: "increment"})

我们通常使用动作创建器功能来生成那些动作对象。这意味着您必须调用动作创建者才能获取动作对象:

const action = increment();
dispatch(action);

您不是呼唤动作创建者。您直接通过

正确的语法是:

dispatch(addProductStarted())