Post ID路由出现在其他组件中

Question

我正在学习路由器和 redux。我正在尝试创建一个博客。现在 post ID 路由显示在其他组件（如关于和投资组合）中，但不显示在主页中，因为我已将其设为精确路径。

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;

减速器

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;

现在，当我加载 "About" 组件时，"Loading Posts..." 显示在 post.js

Answer 1

您遇到问题是因为路径

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

表明 post_id 占位符需要一个动态值。由于 post_id 只是一个占位符，使用 about、portfolio、1 等作为路由参数将满足条件。

即

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

因此 Post 组件与其他组件一起显示。

因此您应该用 Switch 组件包装 Route 组件。由于 Switch 组件仅呈现与路径匹配的第一个子组件，因此当使用 /about 和 /portfolio 时，Post 组件将不会显示。

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>

Post ID路由出现在其他组件中

Post ID route showing up in other components

reactjs

redux

react-redux

redux-router

Post.js:

我的路由器：

About.js

减速器