在其他組件中顯示的帖子ID路線

Question

我正在學習路由器和redux。 我正在嘗試創建一個博客。 現在，帖子ID路徑顯示在“關於”和“投資組合”之類的其他組件中，但未顯示在主頁中，因為我已將其設置為精確路徑。

https://github.com/chiranjeebhub/router-redux

Post.js：

import React, { Component } from "react";
import { connect } from "react-redux";

class Post extends Component {
  render() {
    const post = this.props.post ? (
      <div>
        <h4>{this.props.post.title}</h4>
        <p>{this.props.post.body}</p>
      </div>
    ) : (
      <div>
        <p>loading post ... </p>
      </div>
    );
    return <div>{post}</div>;
  }
}

const mapStateToProps = (state, ownProps) => {
  let id = ownProps.match.params.post_id;
  return {
    post: state.posts.find(post => post.id == id)
  };
};

export default connect(mapStateToProps)(Post);

我的路由器：

import React, { Component } from "react";
import { BrowserRouter, Route } from "react-router-dom";
import NavBar from "./Components/NavBar";
import Home from "./Components/Home";
import About from "./Components/About";
import Post from "./Components/post";
import Portfolio from "./Components/portfolio";

class App extends Component {
  render() {
    return (
      <BrowserRouter>
        <div className="App">
          <NavBar />
          <Route exact path="/" component={Home} />
          <Route path="/about" component={About} />
          <Route path="/portfolio" component={Portfolio} />
          <Route path="/:post_id" component={Post} />
        </div>
      </BrowserRouter>
    );
  }
}

export default App;

About.js

import React, { Component } from "react";

class About extends Component {
  render() {
    return (
      <div>
        <h1>About Me</h1>
      </div>
    );
  }
}

export default About;

減速器

const initState = {
  posts: [
    { id: "1", title: "title1", body: "body1" },
    { id: "2", title: "title2", body: "body2" },
    { id: "3", title: "title3", body: "body3" },
    { id: "4", title: "title4", body: "body4" }
  ]
};

const rootReducer = (state = initState, action) => {
  return state;
};

export default rootReducer;

現在，當我加載“關於”組件時，會從post.js中顯示“正在加載帖子...”

Answer 1

您遇到了問題，因為路徑

<Route path="/:post_id" component={Post} />

表明在post_id占位符處期望有一個動態值。 由於post_id只是一個占位符，使用about ， portfolio ， 1等作為路由參數將滿足條件。

即

// All of them are valid
/about
/portfolio
/1

因此Post組件與其他組件一起顯示。

因此，您應該使用Switch組件包裝Route組件。 由於Switch組件僅呈現與該路徑匹配的第一個子組件，因此使用/about和/portfolio時Post組件將不會顯示。

import { BrowserRouter, Route, Switch } from 'react-router-dom';

 <BrowserRouter>
    <div className="App">
      <NavBar />
      <Switch>
        <Route exact path="/" component={Home} />
        <Route path="/about" component={About} />
        <Route path="/portfolio" component={Portfolio} />
        <Route path="/:post_id" component={Post} />
      </Switch>
    </div>
  </BrowserRouter>