react-router v5 的嵌套路线不会更新布局

Question

I want to split my app in 2 different parts.

An exam list should link to a student list.

import React from 'react';
import ReactDOM from 'react-dom';
import { BrowserRouter, Link, Route, Switch, useRouteMatch } from 'react-router-dom';

// doesn't work
const ExamList = () => {
    return (
        <p>
            current: ExamList ,<Link to='/students'>to Students</Link>
        </p>
    );
};

// nested router
const Exams = () => {
    let { path, url } = useRouteMatch();
    return (
        <BrowserRouter>
            <Switch>
                <Route exact path={path}>
                    <ExamList />
                </Route>
            </Switch>
        </BrowserRouter>
    );
};

// worked 
const Students = () => {
    return (
        <p>
            current: Students ,<Link to='/'>to Exams</Link>
        </p>
    );
};

ReactDOM.render(
    <BrowserRouter>
        <Switch>
            <Route exact path='/'>
                <Exams />
            </Route>
            <Route path='/students'>
                <Students />
            </Route>
        </Switch>
    </BrowserRouter>,
    document.getElementById('root')
);

/ click the link [to Students] doesn't render Students component, but if I refresh the browser, the Students component will be rendered currectly.

/students click the link [to Exams] worked fine.

Answer 1

The problem is that you're not just nesting routes, but you're also nesting routers.

So change Exams from this:

const Exams = () => {
  let { path, url } = useRouteMatch();
  return (
    <BrowserRouter>
      <Switch>
        <Route exact path={path}>
          <ExamList />
        </Route>
      </Switch>
    </BrowserRouter>
  );
};

to this:

const Exams = () => {
  let { path, url } = useRouteMatch();
  return (
    <Switch>
      <Route exact path={path}>
        <ExamList />
      </Route>
    </Switch>
  );
};

---

I recommend you take a look at this example for a good idea of where to go from here / how to approach nested routes in general.