我正在遵循 React Router 4 的重定向(Auth)指南,但我在基于 ajax 返回的 promise 进行渲染时遇到问题。我不确定为什么我在 promise 中的渲染没有被返回。有人能指出我正确的方向吗?
import React from 'react';
import {
Route,
Redirect,
withRouter
} from 'react-router-dom';
import HeaderContainer from '../containers/HeaderContainer';
const PrivateRoute = ({ component: Component, ...props }) => {
const validated = (rest) => {
props.fetchUser()
.then(() => {
return (
<div>
<HeaderContainer />
<Component {...rest}/>
</div>
)
})
.catch(()=> {
return (
<Redirect to={{
pathname: '/signin',
state: { from: props.location }
}}/>
)
}
);
}
return (
<Route {...props} render={rest => {
return (
<div>
{ validated(rest) }
</div>
)
}}/>
)
}
export default withRouter(PrivateRoute);
我的路线是这样的
const Root = ({ store }) => {
return (
<Provider store={ store }>
<BrowserRouter onUpdate={() => window.scrollTo(0, 0)}>
<div className="root">
<Switch>
<Route exact path="/signin" component={SignInContainer}/>
<PrivateRouteContainer exact path="/" component={HomePageContainer} />
</Switch>
</div>
</BrowserRouter>
</Provider>
)
};
最佳答案
那是因为promise不能返回值,它只返回Promise。相反,它执行回调。 Here is some explanation.
您可以重新排列代码,如下所示:
class PrivateRoute extends React.Component {
constructor(props){
super(props);
this.state = {
isFetching: true,
isSuccess: null,
};
}
componentDidMount() {
this.props.fetchUser()
.then(() => {
this.setState({ isFetching: false, isSuccess: true });
})
.catch(()=> {
this.setState({ isFetching: false, isSuccess: false });
});
}
render() {
const { isFetching, isSuccess } = this.state;
return (
<Route {...this.props} render={rest => {
const success = (
<div>
<HeaderContainer />
<Component {...rest}/>
</div>
);
const error = (
<Redirect to={{
pathname: '/signin',
state: { from: this.props.location }
}}/>
);
if(isFetching) {
return null;
}
return isSuccess ? success : error;
}}/>
)
}
}
请注意,Promise 不会返回任何内容,它只是执行一个回调,该回调会触发状态中的新数据的重新渲染。
关于javascript - React Router 4 异步渲染,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46010592/