Javascript React路由器4异步呈现
我正在遵循React Router 4 for Redirect(Auth)的指南,在基于ajax返回的承诺进行渲染时遇到了问题。我不知道为什么我在承诺中的表现没有得到回报。有人能给我指一下正确的方向吗Javascript React路由器4异步呈现,javascript,reactjs,asynchronous,react-router,react-router-v4,Javascript,Reactjs,Asynchronous,React Router,React Router V4,我正在遵循React Router 4 for Redirect(Auth)的指南,在基于ajax返回的承诺进行渲染时遇到了问题。我不知道为什么我在承诺中的表现没有得到回报。有人能给我指一下正确的方向吗 import React from 'react'; import { Route, Redirect, withRouter } from 'react-router-dom'; import HeaderContainer from '../containers/HeaderCo
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);
从“React”导入React;
进口{
路线,,
重新使用
带路由器
}从“反应路由器dom”;
从“../containers/HeaderContainer”导入HeaderContainer;
const PrivateRoute=({component:component,…props})=>{
已验证常量=(剩余)=>{
props.fetchUser()
.然后(()=>{
返回(
)
})
.catch(()=>{
返回(
)
}
);
}
返回(
{
返回(
{已验证(rest)}
)
}}/>
)
}
使用路由器导出默认值(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>
)
};
constroot=({store})=>{
返回(
window.scrollTo(0,0)}>
)
};
这是因为promise不能返回值,它只返回promise。相反,它执行回调
您可以将代码重新排列为如下所示:
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;
}}/>
)
}
}
类PrivateRoute扩展了React.Component{
建造师(道具){
超级(道具);
此.state={
是的,
isSuccess:null,
};
}
componentDidMount(){
this.props.fetchUser()
.然后(()=>{
this.setState({isFetching:false,isSuccess:true});
})
.catch(()=>{
this.setState({isFetching:false,isSuccess:false});
});
}
render(){
const{isFetching,issucess}=this.state;
返回(
{
常数成功=(
);
常量错误=(
);
如果(正在获取){
返回null;
}
返回isSuccess?成功:错误;
}}/>
)
}
}
请注意,Promise不会返回任何内容,它只是执行一个回调,用状态中的新数据触发rerender。如何在服务器端呈现时不获取空组件?