我是React的新手,请记住这一点。React Redux - 从reducer传递数据时容器/组件未更新
我想渲染从food2fork API获取的食谱列表,但即使数据获取正确,我也无法获取更新视图。
这里的recipe_list.js:
import React, { Component } from "react";
import { connect } from "react-redux";
class RecipesList extends Component {
// renderRecipe(recipe) {
// console.log(recipe);
// return (
// <div>{recipe}</div>
// );
// }
render() {
console.log("Render function ", this.props.recipes)
return (
<div>
<p>Recipes</p>
<div>{this.props.recipes}</div>
</div>
);
}
}
function mapStateToProps(state){
return { recipes: state.recipes };
}
export default connect(mapStateToProps)(RecipesList);
这里的reducer_recipes.js:
import FETCH_RECIPES from "../actions/index";
export default function(state = [], action){
switch (action.type) {
case FETCH_RECIPES:
return action.payload;
}
return state;
}
这里的/reducers/index.js:
import { combineReducers } from 'redux';
import RecipesReducer from "./reducer_recipes";
console.log(RecipesReducer);
const rootReducer = combineReducers({
recipes: RecipesReducer
});
export default rootReducer;
这里的/actions/index.js :
import axios from "axios";
const API_KEY = "****************************";
export const URL = `https://food2fork.com/api/search?key=${API_KEY}`;
export const FETCH_RECIPES = "FETCH_RECIPES";
export function fetchRecipes(term){
const url = `${URL}&q=${term}`;
const request = axios.get(url);
return {
type: FETCH_RECIPES,
payload: request
};
}
我没有得到任何具体的错误。该视图只是不更新。我试图在文件周围传播一些console.log以试图了解问题所在。 看起来Reducer没有成功地将有效载荷传递给组件。
注意:我正在使用react-promise,因此从axios返回的许诺会自动解析。
任何想法?
============================================= ======================
编辑:
谢谢你的有用的链接,但有清楚,我的东西仍然在这里失踪。 我已经修改了操作指数:
function getStuffSuccess(response) {
return {
type: FETCH_RECIPES,
payload: response
};
}
function getStuffError(err) {
return {
type: ERROR_FETCH_RECIPES,
payload: err
};
}
export function fetchRecipes(term) {
const url = `${URL}&q=${term}`;
return function(dispatch) {
axios.get(url)
.then((response) => {
dispatch(getStuffSuccess(response));
})
.catch((err) => {
dispatch(getStuffError(err));
});
};
}
我也包括终极版,形实转换到商店:
import React from 'react';
import ReactDOM from 'react-dom';
import { Provider } from 'react-redux';
import { createStore, applyMiddleware } from 'redux';
import ReduxPromise from "redux-promise";
import Thunk from 'redux-thunk';
import App from './components/app';
import reducers from './reducers';
const createStoreWithMiddleware = applyMiddleware(Thunk, ReduxPromise) (createStore);
ReactDOM.render(
<Provider store={createStoreWithMiddleware(reducers)}>
<App />
</Provider>
, document.querySelector('.container'));
行为并没有从之前改变。该视图仍未更新。
注:如果我console.log减速器的有效载荷的数据在那里。但是当我试图在View中做同样的事情时,什么也没有发生。
你应该阅读[这](https://stackoverflow.com/a/35684082/3148807) –