React不呈现Route Components

Question

I am building a consumer facing app with a admin dashboard. I want to keep the routing separate for them and so trying to delegate :-

App.js

import React, {Component} from 'react';
import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';

//styles
import './style/bootstrap/bootstrap.scss';

//apps
import Mainapp from './mainapp/Mainapp';
import Admin from './admin/Admin';

const MainappContainer = () => (
  <Mainapp />
);

const AdminContainer = () => (
  <Admin />
);

class App extends Component{
  render(){
    return (
      <Router>
        <Switch>
            <Route path="/admin" component={AdminContainer}/>
            <Route path="/" component={MainappContainer}/>
        </Switch>
      </Router>
    )
  }
}

export default App;

Admin.js

import React, {Component} from 'react';
import { BrowserRouter as Router, Route } from 'react-router-dom';


//styles
import './admin-style.scss';

//layout
import ControlPanel from './component/layout/ControlPanel';
import Navbar from './component/layout/Navbar';

//pages
import Quote from './component/pages/quote/Quote';

class Admin extends Component{
    render(){
      return (
        <div className="adminWrapper">
          <ControlPanel />
          <section className="viewPanel">
            <Navbar />
            <Router>
              <Route path="/quote" component={Quote}/>
            </Router>
          </section>
        </div>
      )
    }
  }

  export default Admin;

However when I hit the URL

http://localhost:3000/admin/quote

it doesn't seem to load the quote component

Quote.js

import React, { Component } from 'react';

class Quote extends Component {
    render() {
        return (
            <div className="float-right pr-3">
                <h3>
                    Quote Page
                </h3>
            </div>
        )
    }
}

export default Quote;

Answer 1

When dealing with nested subroutes, the easiest solution is to use match .

path - (string) The path pattern used to match. Useful for building nested Routes.

url - (string) The matched portion of the URL. Useful for building nested Links.

By design, components placed inside a Route's component render method are given several additional props from react-router-dom. Among them are history and match . You can leverage these props to either to match against sub routes and/or to control browser history location.

In addition, you only need one instance of BrowserRouter sitting at the top-level of the application, then you can use Switch to optionally render any main or sub routes. And you don't need to use class components unless you're utilizing state and/or a class field.

A very basic, rudimentary working example of your application :

---

src/components/Admin/index.js

import React from "react";
import { Switch, Link, Route } from "react-router-dom";
import ControlPanel from "../ControlPanel";
import Quote from "../Quote";

// since Admin is placed inside a Route's component render
// method, it has access to history and match
function Admin({ history, match }) {
  return (
    <div className="adminWrapper">
      <ControlPanel />
      <section className="viewPanel">
        <Link to={`${match.url}/quote`}>View quote</Link>
        <br />
        <Switch>
          <Route exact path={`${match.path}/quote`} component={Quote} />
        </Switch>
      </section>
      <br />
      <button type="button" onClick={() => history.goBack()}>
        Go Back
      </button>
    </div>
  );
}

export default Admin;

index.js

import React from "react";
import ReactDOM from "react-dom";
import { BrowserRouter, Link, Route, Switch } from "react-router-dom";
import Admin from "./components/Admin";

const linkStyle = {
  padding: "0 10px"
};

function App() {
  return (
    <BrowserRouter>
      <Link style={linkStyle} to="/">
        Home
      </Link>
      <Link style={linkStyle} to="/admin">
        Admin
      </Link>
      <Switch>
        <Route path="/admin" component={Admin} />
        <Route path="/" render={() => <h1>Main App</h1>} />
      </Switch>
    </BrowserRouter>
  );
}

ReactDOM.render(<App />, document.getElementById("root"));

Answer 2

 <Route exact path="/admin" component={AdminContainer}/>     
 <Route exact path="/admin/quote" component={Quote}/>

This won't route you to /admin/quote instead it will route you to /admin/admin/quote.

Since it is inside admin just /quote is enough

<Route path="/admin" component={AdminContainer}/>
<Route path="/quote" component={Quote}/>

Answer 3

Follow the Nested Routing Example

The main changes you need to do are:
1. Remove the <Router></Router> from Admin component and
2. Prepend match.path to "/quotes" , like it is done in Topics component in the example. In the example, Topics is a function component so it is receiving match as function parameter. As your Admin component is class component, you can access it as this.props.match in render method.

<Route path={`${this.props.match.path}/quote`} component={Quote}/>