React HOC无法将道具传递给增强组件

时间:2019-03-21 16:56:59

标签: javascript reactjs typescript react-context

我有这段代码:

const defaultValue = new Api()

const ApiContext = React.createContext(defaultValue);
const ApiProvider = ApiContext.Provider;
const ApiConsumer = ApiContext.Consumer;


const withApi = (Enhanced: any) => {

    return (        
        <ApiConsumer>
            {api => {
                return <Enhanced api={api}/>;
            }}
        </ApiConsumer>
    )
}

export default ApiContext;
export {ApiContext, ApiProvider, ApiConsumer, withApi};

在我的应用中,我有这样的东西:

const api = new ApiManager({...});

ReactDOM.hydrate(
    <Provider store={store}>
        <BrowserRouter>
            <ApiProvider value={api}>
                <Main />
            </ApiProvider>
        </BrowserRouter>
    </Provider>, document.querySelector('#app')
);

但是此行return <Enhanced api={api}/>;会导致以下错误:

1。

  

警告:React.createElement:类型无效-预期为字符串   (对于内置组件)或类/函数(对于复合   组件),但得到:。你是不是偶然   导出JSX文字而不是组件?

2。

  

未捕获的不变变量:元素类型无效:预期a   字符串(对于内置组件)或类/函数(对于复合   组件),但得到了:对象。

3。

Uncaught (in promise) Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

Check the render method of `Context.Consumer`.

我在这里做错了什么? 如何将api属性传递给增强型组件?

[编辑]

这就是我调用组件的方式:

App.tsx

class App extends React.Component {
    render() {
        return (
            <React.Fragment>                
                    <Switch>
                        {routes.map(({ path, exact, component: C }) => {

                            return <Route
                                key={path}
                                path={path}
                                exact={exact}
                                render={(props) => {

                                    return withApi(<C {...props} />);

                                }} />
                        })}
                    </Switch>                
            </React.Fragment>
        )
    }
}

1 个答案:

答案 0 :(得分:1)

您没有正确编写withApi HOC。它应该返回一个功能组件而不是JSX

const withApi = (Enhanced: any) => {
  return (props) => {
    return (        
        <ApiConsumer>
            {api => {
                return <Enhanced {...props} api={api}/>;
            }}
        </ApiConsumer>
    )
  }
}

并像使用它

class App extends React.Component {
    render() {
        return (
            <React.Fragment>                
                    <Switch>
                        {routes.map(({ path, exact, component: C }) => {
                            const Comp = withApi(C);
                            return <Route
                                key={path}
                                path={path}
                                exact={exact}
                                render={(props) => {

                                    return <Comp {...props}/>

                                }} />
                        })}
                    </Switch>                
            </React.Fragment>
        )
    }
}