React Router 嵌套路由不呈现

Question

我正在尝试以这种方式呈现 Nav 组件以及任何页面内容，因为我希望能够在 Nav 中访问 this.props.location（以突出显示导航栏上的活动位置），因此已分配它到“/”路由并传递子路由，而不是简单地渲染它。但是，只有 Nav 组件呈现； none 来自其他路由的组件在任何页面上呈现，因为 {this.props.children} 似乎在导航中未定义。我是 React 的新手，所以任何帮助都会很棒。

App.tsx:

const landingPage = () => {
  if (Auth.isUserAuthenticated()) {
    return (
      <UserProfile/>
    );
  } else {
    return (
      <Landing />
    );
  }
};

const routes = () => {
  return (
    <Route path="/" component={Nav}>
      <Route path="/" component={landingPage}/>
      <Route path="/login" component={LoginForm}/>
      <Route path="/register" component={RegistrationForm}/>
      <Route path="/logout" component={Logout}/>
      <Route path="/about" component={About}/>
    </Route>
  )
}

class App extends React.Component<{}, null> {
  render() {
    return (
      <BrowserRouter>
        {routes()}
      </BrowserRouter>
    );
  }
}

Nav.tsx

class Nav extends React.Component<any, any> {
  constructor() {
    super();
  };

  linkActive = (link) => {
    return this.props.location.pathname.includes(link);
  };

  logInOut = () => {
    if (!Auth.isUserAuthenticated()) {
      return (
        [
          <NavItem active={this.linkActive("login")} href="/login">Login</NavItem>,
          <NavItem active={this.linkActive("register")} href="/register">Register</NavItem>
        ]
      );
    } else {
      return (
        <NavItem eventKey={"logout"} href="/logout">Logout</NavItem>
      );
    }
  };

  render() {
    return (
      <div>
        <Navbar className="fluid collapseOnSelect">
          <Navbar.Collapse>
            <Navbar.Header>
              <Navbar.Brand>
                <a href="/">Home</a>
              </Navbar.Brand>
              <Navbar.Toggle />
            </Navbar.Header>
            <BootstrapNav>
              <NavItem active={this.linkActive("about")} href="/about">About</NavItem>
            </BootstrapNav>
            <BootstrapNav pullRight>
              {this.logInOut()}
            </BootstrapNav>
          </Navbar.Collapse>
        </Navbar>
        {this.props.children}
      </div>
    );
  }
}

Answer 1

Nav.tsx 组件

如果我没记错的话你用的是react-router v4

I want to be able to access this.props.location in Nav (to highlight active location on Nav bar), so have assigned it to "/" route and passing child routes rather than simply rendering it.

为了能够访问 this.props.location、this.props.history 或 this.props.match，请使用 withRouter 高阶组件。

首先让我们导入withRouter HOC。

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

要使用它，请用 withRouter 包装您的 Nav 组件。

// example code
export default withRouter(Nav);

App.tsx 组件

重新组织你的路线。我强烈建议使用 Switch.

// We are still using BrowserRouter 
import {
  BrowserRouter as Router,
  Switch,
} from 'react-router-dom';

<Router>
  <Switch>
    <Route path="/" component={landingPage}/>
    <Route path="/login" component={LoginForm}/>
    <Route path="/register" component={RegistrationForm}/>
    <Route path="/logout" component={Logout}/>
    <Route path="/about" component={About}/>
  </Switch>
</Router>

在您的 App.tsx 渲染方法中，您可以在顶部添加导航。

让我们假装只有经过身份验证的用户才能看到导航组件。在您的情况下，您不需要访问 this.props.children。

renderNav() {
  return (this.props.authenticated) ? <Nav /> : null;
}

render() {
  return (
    <div>
      {this.renderNav()}
      <Router>
        <Switch>
          <Route path="/" component={landingPage}/>
          <Route path="/login" component={LoginForm}/>
          <Route path="/register" component={RegistrationForm}/>
          <Route path="/logout" component={Logout}/>
          <Route path="/about" component={About}/>
        </Switch>
      </Router>
    </div>
  );
}

如果您想了解有关 react-router v4 的更多信息，请阅读 react-training 上的这些示例、指南和 API。希望对你有帮助！

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