[英]React redux display data from async action
I am building a react app and implementing redux for data. 我正在构建一个react应用程序并实现redux for data。 When I navigate to a particular route, I want to dispatch the action to fetch the data from an external API and then once the data comes back, display the data for the user.
当我导航到特定路线时,我想调度操作以从外部API获取数据,然后一旦数据返回,就显示用户的数据。
Store : 商店:
import { createStore, applyMiddleware } from 'redux';
import thunkMiddleware from 'redux-thunk';
import createLogger from 'redux-logger';
import { syncHistoryWithStore } from 'react-router-redux';
import { browserHistory } from 'react-router';
import rootReducer from '../reducers/index';
const initialState = {
marvel :{
characters: []
}
};
const store = createStore(rootReducer, initialState, applyMiddleware(thunkMiddleware, createLogger()));
export const history = syncHistoryWithStore(browserHistory, store);
if (module.hot) {
module.hot.accept('../reducers/', () => {
const nextRootReducer = require('../reducers/index').default;
store.replaceReducer(nextRootReducer);
});
}
export default store;
reducer : 减速机:
import * as constants from '../constants/constants';
const initialState = {
characters: [],
isFetching: false,
errorMessage: null
};
const marvelReducer = (state = initialState, action) => {
switch (action.type) {
case constants.FETCH_MARVEL :
return Object.assign({},state,{isFetching: true});
case constants.FETCH_MARVEL_SUCCESS :
return Object.assign({}. state,{
characters: [...action.response],
isFetching: false
});
case constants.FETCH_MARVEL_ERROR :
return Object.assign({}, state,{
isFetching: false,
errorMessage: action.message
});
default :
return state;
}
};
export default marvelReducer;
actions: 动作:
import 'whatwg-fetch';
import * as constants from '../constants/constants';
export const fetchMarvel = (dispatch) => {
const MARVEL_API = 'http://gateway.marvel.com:80/v1/public/characters?apikey=e542b1d89f93ed41b132eda89b9efb2c';
dispatch({
type: constants.FETCH_MARVEL
});
return fetch(MARVEL_API).then(
response => {
dispatch({
type: constants.FETCH_MARVEL_SUCCESS,
response
});
},
error => {
dispatch({
type: constants.FETCH_MARVEL_ERROR,
message: error.message || 'Something went wrong with fetchMarvel'
});
});
};
component : 零件 :
import React, { Component } from 'react';
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
import * as actions from '../actions/actions';
import '../styles/homeStyles.css';
class Home extends Component {
render() {
const { characters, isFetching, errorMessage } = this.props;
return (
<div>
<h1>React Starter App</h1>
<h2>This is the home page</h2>
</div>
);
}
}
function mapStateToProps(state) {
return {
characters: state.characters,
isFetching: state.isFetching,
errorMessage: state.errorMessage
};
}
function mapDispatchToProps(dispatch) {
return { actions: bindActionCreators(actions, dispatch) };
}
export default connect(mapStateToProps, mapDispatchToProps)(Home);
I know I'm not currently displaying the props anywhere in the application, but first I am just trying to get them populated. 我知道我目前没有在应用程序的任何地方显示道具,但首先我只是想让它们填充。 What step am I missing to dispatch the action so that I can populate the props from state?
我错过了什么步骤来发送动作,以便我可以从州填充道具?
You are not dispatching the action anywhere. 你不是在任何地方派遣行动。 So nothing happens.
没有任何反应。
You probably want to do this in a React lifecycle hook, for example: 您可能希望在React生命周期钩子中执行此操作,例如:
class Home extends Component {
componentDidMount() {
this.props.actions.fetchMarvel();
}
render() {
const { characters, isFetching, errorMessage } = this.props;
return (
<div>
<h1>React Starter App</h1>
<h2>This is the home page</h2>
</div>
);
}
}
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