我试图在我的React容器中获得XHR请求的响应作为道具。我正在尝试做的是向api发出GET请求,并将响应转换为一个名为“ game”的对象,我可以在其中进行反应。我成功完成了与GET请求类似的操作,该请求返回了一个称为“游戏”的对象数组,可以在响应中进行映射;但是,当我尝试请求“游戏”对象时,我从api得到了很好的响应,但是react显示未定义“游戏”。
我认为我的减速器或操作文件可能存在问题,也许是如何设置我的初始状态,但我不知道如何使它工作。
感谢您提供的所有帮助!非常感谢您的时间和耐心。
我将在下面发布我的代码。
Reducer文件如下所示:
import { LOAD_GAMES, SET_CURRENT_GAME } from "../actionTypes";
const game = (state = [], action) => {
switch (action.type) {
case LOAD_GAMES:
return [...action.games];
case SET_CURRENT_GAME:
return [...action.game];
default:
return state;
}
};
export default game;
动作文件看起来像这样:
import { apiCall } from "../../services/api";
import { addError } from "./errors";
import { LOAD_GAMES, SET_CURRENT_GAME } from "../actionTypes";
export const loadGames = games => ({
type: LOAD_GAMES,
games
});
export const setCurrentGame = game => ({
type: SET_CURRENT_GAME,
game
});
export const fetchGames = () => {
return dispatch => {
return apiCall("GET", "api/games/")
.then(res => {
dispatch(loadGames(res));
})
.catch(err => {
dispatch(addError(err.message));
});
};
};
//WRITE A FUNCTION TO SET_CURRENT_GAME TO BE THE ID OF THE GAME THAT IS CLICKED ON.
export const getGameDetails = game_id => {
return dispatch => {
return apiCall("GET", `/api/games/${game_id}`)
.then(res => {
dispatch(setCurrentGame(res));
})
.catch(err => {
dispatch(addError(err.message));
});
};
};
export const postNewGame = title => (dispatch, getState) => {
return apiCall("post", "/api/games", { title })
.then(res => {})
.catch(err => addError(err.message));
};
React容器看起来像这样:
import React, { Component } from "react";
import { connect } from "react-redux";
import { Link } from "react-router-dom";
import { getGameDetails } from "../store/actions/games";
class GameDetails extends Component {
componentDidMount() {
const game_id= this.props.match.params.game_id;
this.props.getGameDetails(game_id);
}
render() {
const { game } = this.props;
return (
<div className="home-hero">
<div className="offset-1 col-sm-10">
<h4>You are viewing the Game Page for {game.title}</h4>
</div>
</div>
);
}
}
function mapStateToProps(state) {
return {
game: state.game
};
}
export default connect(mapStateToProps, { getGameDetails })(
GameDetails
);
编辑-通过显示游戏响应数组的地图而工作的GameList容器如下所示:
import React, { Component } from "react";
import { connect } from "react-redux";
import { Link } from "react-router-dom";
import { fetchGames } from "../store/actions/games";
class GameList extends Component {
componentDidMount() {
this.props.fetchGames();
}
render() {
const { games } = this.props;
let gameList = games.map(g => (
<li className="list-group-item" key= {g._id}>
<Link to={`/games/${g._id}`}>
{g.title}
</Link>
</li>
));
return (
<div className="row col-sm-8">
<div className="offset-1 col-sm-10">
<ul className="list-group" id="games">
{gameList}
</ul>
</div>
</div>
);
}
}
function mapStateToProps(state) {
return {
games: state.games
};
}
export default connect(mapStateToProps, { fetchGames })(
GameList
);
为澄清起见,reducer的“ LOAD_GAMES”部分和操作正常;但是,“ SET_CURRENT_GAME”不起作用。
我认为您使用的是减速器错误
reducer的状态应该是对象,而不是数组IMO,例如这样:
import { LOAD_GAMES, SET_CURRENT_GAME } from "../actionTypes";
const initState = {
current: undefined,
list: []
}
const game = (state = initState, action) => {
switch (action.type) {
case LOAD_GAMES:
state.list = action.games;
return state
case SET_CURRENT_GAME:
state.current = action.game;
return state;
default:
return state;
}
};
export default game;
比GameDetails中的>
function mapStateToProps(state) { return { game: state.game.current }; }
并且在同一GameList
function mapStateToProps(state) {
return {
list: state.game.list
};
}