我有这样的action
:
import { GET, POST, PUT, REMOVE } from "../../Utils/Http";
export const FETCH_ARTICLES = "FETCH_ARTICLES";
export const FETCH_ARTICLES_SUCCESS = "FETCH_ARTICLES_SUCCESS";
export const FETCH_ARTICLES_FAILURE = "FETCH_ARTICLES_FAILURE";
export const RESET_ARTICLES = "RESET_ARTICLES";
export function fetchArticles() {
const request = GET("/articles");
return {
type: FETCH_ARTICLES,
payload: request
};
}
export function fetchArticlesSuccess(articles) {
return {
type: FETCH_ARTICLES_SUCCESS,
payload: articles
};
}
export function fetchArticlesFailure(error) {
return {
type: FETCH_ARTICLES_FAILURE,
payload: error
};
}
和reducer
:
import {
FETCH_ARTICLES,
FETCH_ARTICLES_SUCCESS,
FETCH_ARTICLES_FAILURE,
RESET_ARTICLES
} from "../Actions/Article";
const INITIAL_STATE = {
articlesList: {
articles: { data: [], total: 0 },
error: null,
loading: false
},
newTractor: { article: null, error: null, loading: false },
activeTractor: { article: null, error: null, loading: false },
deletedTractor: { article: null, error: null, loading: false }
};
const reducer = (state = INITIAL_STATE, action) => {
switch (action.type) {
case FETCH_ARTICLES:
return {
...state,
articleList: { articles: {}, error: null, loading: true }
};
case FETCH_ARTICLES_SUCCESS:
return {
...state,
articleList: { articles: action.payload, error: null, loading: false }
};
case FETCH_ARTICLES_FAILURE:
return {
...state,
articleList: { articles: {}, error: action.payload, loading: false }
};
case RESET_ARTICLES:
return {
...state,
articleList: { articles: {}, error: null, loading: false }
};
default:
return state;
}
};
export default reducer;
我试着在list component
中使用这种方式:
import React, { Component } from "react";
import { connect } from "react-redux";
import { isUndefined } from "lodash";
import {
fetchArticles,
fetchArticlesSuccess,
fetchArticlesFailure
} from "../../Store/Actions/Article";
class ArticleList extends Component {
componentDidMount() {
this.props.fetchArticles();
}
render() {
return <div className="ui segment" />;
}
}
const mapDispatchToProps = dispatch => {
return {
fetchArticles: () => {
dispatch(fetchArticles()).then(response => {
!response.error
? dispatch(fetchArticlesSuccess(response.payload.data))
: dispatch(fetchArticlesFailure(response.payload.data));
});
}
};
};
export default connect(null, mapDispatchToProps)(ArticleList);
还有Http.js
:
import axios from "axios";
const http = axios.create({
baseURL: process.env.BASE_API_URL
});
export const GET = (url, params) => {
return new Promise((resolve, reject) => {
http({
method: "get",
url,
params
})
.then(response => {
resolve(response);
})
.catch(err => {
console.log("GET err ", err);
reject(err);
});
});
};
...
但结果我得到:
在TypeError: dispatch is not a function
的dispatch(fetchArticles()).then(response => {
我做错了什么?
另外我怎么写这部分:
fetchTractors()).then(response => {
!response.error
? dispatch(fetchTractorsSuccess(response.payload.data))
: dispatch(fetchTractorsFailure(response.payload.data));
}
在组件类?可能吗? (不要把它移到mapDispatchToProps
区块)
我从这里采取了一些想法:https://github.com/rajaraodv/react-redux-blog/
我在这里可以看到很多问题:
const mapDispatchToProps = dispatch => {
return {
fetchArticles: () => {
dispatch(fetchArticles()).then(response => {
!response.error
? dispatch(fetchArticlesSuccess(response.payload.data))
: dispatch(fetchArticlesFailure(response.payload.data));
});
}
};
};
4.你需要通过mapDispatchToProps传递动作创建者,如下所示:
import { bindActionCreators } from "redux"
const mapDispatchToProps = dispatch => bindActionCreators({
fetchArticles,
fetchArticlesSuccess,
fetchArticlesFailure,
}, dispatch)
问题出在这里:
export default connect(mapDispatchToProps)(ArticleList);
第一个参数应该是mapStateToProps。但你实际上可以传递null:
export default connect(null, mapDispatchToProps)(ArticleList);