反应路由器条件

Question

我有多个路由器，我在index.js 中导入了Nav 组件，我只需要为About 显示Nav，但我不想为Topics 显示Nav 组件。我不想在Home 和About 中导入Nav 组件，因为我可以有很多路由器

const BasicExample = () => (
  <Router>
    <div>
      <ul>
        <li>
          <Link to="/">Home</Link>
        </li>
        <li>
          <Link to="/about">About</Link>
        </li>
        <li>
          <Link to="/topics">Topics</Link>
        </li>
      </ul>
      <Nav />
      <hr />

      <Route exact path="/" component={Home} />
      <Route path="/about" component={About} />
      <Route path="/topics" component={Topics} />
    </div>
  </Router>
);

你也可以看看完整的code in codesandbox

Answer 1

您可以创建一个 HOC 布局，该布局可以采用额外的道具 noNav 来隐藏您的导航：

组件布局：

import React from "react";
import { Link } from "react-router-dom";
import Nav from "../components/Nav/Nav";

const Layout = ({ children, noNav }) => (
  <div>
    <ul>
      <li>
        <Link to="/">Home</Link>
      </li>
      <li>
        <Link to="/about">About</Link>
      </li>
      <li>
        <Link to="/topics">Topics</Link>
      </li>
    </ul>
    {noNav ? null : <Nav />}
    <hr />

    {children}
  </div>
);

export default Layout;

index.js

import React from "react";
import { render } from "react-dom";
import { BrowserRouter as Router, Route } from "react-router-dom";
import About from "./components/About";
import Home from "./components/Home";
import Topics from "./components/Topics";
import Layout from "./hoc/Layout";

const BasicExample = () => (
  <Router>
    <div>
      <Route
        exact
        path="/"
        render={() => (
          <Layout>
            <Home />
          </Layout>
        )}
      />
      <Route
        path="/about"
        render={() => (
          <Layout>
            <About />
          </Layout>
        )}
      />
      <Route
        path="/topics"
        render={(props) => (
          <Layout noNav>
            <Topics {...props} />
          </Layout>
        )}
      />
    </div>
  </Router>
);

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

演示：https://codesandbox.io/s/react-router-forked-k1ve2?file=/index.js:0-874

Answer 2

您可以使用 windows.location.pathname 来识别正确的路径，然后如果您的路径与“/”完全匹配，则导航组件将被渲染或不渲染。可以使用三元运算符实现

const BasicExample = () => (
  <Router>
    <div>
    <ul>
    <li>
    <Link to="/">Home</Link>
    </li>
    <li>
        <Link to="/about">About</Link>
        </li>
        <li>
          <Link to="/topics">Topics</Link>
        </li>
      </ul>
     {window.location.pathname === "/" ? <Nav /> :""}
      <hr />

      <Route exact path="/" component={Home} />
      <Route path="/about" component={About} />
      <Route path="/topics" component={Topics} />
    </div>
  </Router>
);