react-router-dom：从 <BrowserRouter> 组件中获取 props.location

Question

我有一个简单的应用程序，它使用来自 'react-router-dom' v4 的 BrowserRouter。我试图从<BrowserRouter/> 组件中访问location.pathname 属性，但无济于事：

class App extends Component{
  render(){
    return (
      <BrowserRouter>
        // How do I access this.props.location?
        <div className={(this.props.location.pathnme === "/account") ? "bgnd-black" : "bgnd-white"} >
          <Switch>
            <Route path="/login" component={LoginPage}/>
            <Route path="/success" component={LoginSuccess}/>
            <Route path="/account" component={MyAccount}/>
            ...
            <Route component={Error404}/>
          </Switch>
        </div>
      </BrowserRouter>
    );
  }
}

我知道我可以使用this.props.location.pathname 通过子组件访问应用程序的当前路径位置，但我需要从父组件访问它，就在<BrowserRouter/> 的下方，以运行与子组件无关的附加逻辑成分。我怎样才能得到这个位置？

Answer 1

您也可以使用withRouter 执行此操作，其结果与将代码放入render 参数中的结果相似，并且无需“假”<Route/>。

本质上，您将需要知道位置的 JSX 放在它自己的组件中，该组件由 withRouter 包装。这将位置提供给组件：

import { withRouter } from 'react-router-dom';

const Content = withRouter(props =>
    <div className={(props.location.pathname === "/account") ? "backg...
    ...
    </div>
);

然后你在你的主路由器部分使用它：

class App extends Component{
    render() {
        return (
            <BrowserRouter>
                <Content/>
                ...

Answer 2

由于react-router v5.1.0，您可以使用useLocation。

https://reactrouter.com/web/api/Hooks/uselocation

class App extends Component{
  render(){
    const location = useLocation();

    return (
      <div className={(location.pathname === "/account") ? "bgnd-black" : "bgnd-white"} >
        //...
      </div>
    );
  }
}

// ...
<BrowserRouter>
  <App />
</BrowserRouter>

Answer 3

在挖掘了他们的 GitHub 问题后，我找到了解决方案。我必须在<BrowserRouter /> 中渲染一个<Route />，并将我的应用程序的其余部分传递给它的render() 函数，并以history 作为参数。在渲染函数中，我可以在history.location.pathname 中找到应用的位置。

class App extends Component{
  render(){
    return (
      <BrowserRouter>

        // We must add a parent <Route> and render its children while passing 'history' as parameter
        <Route path={Paths.reserve} render={(history) => 

          // Within render(), we can find it in history.location.pathname
          <div className={(history.location.pathname === "/account") ? "background-black" : "background-white"} >
            <Switch>
              <Route path="/login" component={LoginPage}/>
              <Route path="/success" component={LoginSuccess}/>
              <Route path="/account" component={MyAccount}/>
              ...
              <Route component={Error404}/>
            </Switch>
          </div>
          }/>
        }} />
      </BrowserRouter>
    );
  }
}

这将自动更新history 参数，而无需在componentDidMount() 或componentDidUpdate() 上重新渲染

Answer 4

通过这样做，您实现了您的要求

import AccessRoute from './AccessRoute'

class App extends Component{
  render(){
    return (
      <BrowserRouter>

  <AccessRoute>    
 <div className={(this.props.location.pathnme === "/account") ? "bgnd-black" : "bgnd-white"} >
          <Switch>
            <Route path="/login" component={LoginPage}/>
            <Route path="/success" component={LoginSuccess}/>
            <Route path="/account" component={MyAccount}/>
            ...
            <Route component={Error404}/>
          </Switch>
        </div>
       </AccessRoute>    
      </BrowserRouter>
    );
  }
}

AccessRoute.jsx

import React from 'react'
import {withRouter} from 'react-router';
class AccessRoute extends React.Component{
    constructor(props){
        super(props);
    }



 //If you want to find the location on mount use this 

 componentDidMount(){
        console.log("the path name is ",this.props.location.pathname);
    }


 //If you want to find the location on change use this

  componentDidUpdate(prevprops){
    if(this.props.location.pathname!=prevprops.location.pathname){
        console.log("the new path name is ",this.props.location.pathname);
    }

}

    render(){
        return(

            this.props.children

            );
    }
}
export default withRouter(AccessRoute)