javascript - React Router 的 Props 错误

Question

我正在学习使用 Redux、React 和 React Router。 我遇到过这样的问题:

当我使用 Link 从“/”重定向到“/details/{id}”等 URL 时，我发现调用了错误的操作创建者。来自“/”组件的操作创建者被称为“/details/{id}”中组件的操作创建者。

但是如果我刷新页面，一切都会好起来的。调用正确的操作。

带有链接的路由:<Link to={/details/${this.props.movi​​e.id} }>

其他错误:如果我从此页面按“返回”返回到“/”，我会收到错误消息，提示我的 props 数据未定义。 例如，props 为空，并且 http-request 的操作创建者不会从 componentDidMount() 调用(？)。

但是如果我再次刷新页面，一切都会恢复正常。

路由出了什么问题？还是还原？

ReactDOM.render(
    <Provider store={store}>
      <BrowserRouter>
        <Routes />
      </BrowserRouter>
    </Provider>, 
    document.getElementById('root'));


const Routes = () => {
    return <div>
        <Route exact path="/" component={Main} />
        <Route path="/details/:id" component={MovieDetailsContainer} />
    </div>;
}

“/”:

    class MoviesDiscover extends Component {
    componentDidMount() {
        this.props.dicoverMovies();
    }

    render() {
      ...
    }
}

const mapStateToProps = (state) => {
    return {
        items: state.movieItems,
        hasErrored: state.movieHasErrored,
        isLoading: state.movieIsLoading,
    };
};

const mapDispatchToProps = (dispatch) => {
    return {
        dicoverMovies: (url) => dispatch(dicoverMovies(url))
    };
};

export default connect(mapStateToProps, mapDispatchToProps)(MoviesDiscover);

“详细信息/{id}”:

class MovieDetailsContainer extends Component {
    componentDidMount() {
        var id = this.props.match.params.id;
        this.props.getMovie(id); // called from MoviesDiscover instead of this, after routing
    }

    render() {
        var id = this.props.match.params.id;
        ...
    }
}

const mapStateToProps = (state) => {
    return {
        item: state.movieItems,
        hasErrored: state.movieHasErrored,
        isLoading: state.movieIsLoading,
    };
};

const mapDispatchToProps = (dispatch) => {
    return {
        getMovie: (url) => dispatch(getMovieDetails(url))
    };
};


export default connect(mapStateToProps, mapDispatchToProps)(MovieDetailsContainer);

操作(两个请求相同 - 结果、错误和加载的操作):

 ...
export function moviesDataSuccess(items) {
    return {
        type: MOVIES_RESULTS,
        isLoading: false,
        items: items
    };
}

       export function dicoverMovies() {
        return (dispatch) => {
            dispatch(moviesIsLoading(true));

            API.get(URL_MOVIE_DISCOVER)
              .then(response => {
                dispatch(moviesIsLoading(false));
                dispatch(moviesDataSuccess(response.data));
              })
              .catch(e => {
                console.log(e);
                dispatch(moviesHasErrored(true))
              });
        };
    }

    export function getMovieDetails(id) {
        return (dispatch) => {
            dispatch(moviesIsLoading(true));

            API.get(URL_MOVIE_DETAILS(id))
              .then(response => {
                dispatch(moviesIsLoading(false));
                dispatch(moviesDataSuccess(response.data));
              })
              .catch(e => {
                console.log(e);
                dispatch(moviesHasErrored(true))
              });
        };
    }

reducer :

   export function movieHasErrored(state = false, action) {
    switch (action.type) {
        case MOVIES_ERROR:
            return action.hasErrored;
        default:
            return state;
    }
}

export function movieIsLoading(state = false, action) {
    switch (action.type) {
        case MOVIES_LOADING:
            return action.isLoading;
        default:
            return state;
    }
}

export function movieItems(state = {}, action) {
    switch (action.type) {
        case MOVIES_RESULTS:
            return action.items;
        default:
            return state;
    }
}

const rootReducer = combineReducers({
    movieHasErrored, 
    movieIsLoading, 
    movieItems
});

我很乐意接受所有建议。谢谢。

Answer 1

React 路由器首先匹配关闭 URL，我认为问题在于组件的顺序。 我建议你像这样订购它们，它应该得到解决:

const Routes = () => {
    return <div>
        <Route path="/details/:id" component={MovieDetailsContainer} />
        <Route exact path="/" component={Main} />
    </div>;
}

React Router 还有一个用于在 URL 之间切换的组件，如果您的 URL 不明确，您可以利用该组件:

 import { BrowserRouter as Router, Route, Link, Switch } from "react-router-dom";
 ...
 <Switch>
        <Route path="/about" component={About} />
        <Route path="/company" component={Company} />
        <Route path="/:user" component={User} />
 </Switch>

PS:抱歉，如果这不是您正在寻找的答案，我只是想发表评论而不是发布此答案，我只是还没有直接发表评论的声誉:|