Question

我正在学习路由器和redux。我正在尝试创建一个博客。现在，帖子ID路线会显示在“关于”和“投资组合”等其他组件中，但不会显示在主页中，因为我已将其设置为精确路径。

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“关于”组件时，会从post.js中显示“正在加载帖子...”

Answer 1

您遇到问题，因为路径

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

表明在post_id占位符处期望有一个动态值。由于post_id只是使用about，portfolio，1等的占位符，因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出现。

因此，您应该用Route组件包装Switch组件。由于Switch组件仅呈现与该路径匹配的第一个子对象，因此当使用Post和/about时，/portfolio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>

在其他组件中显示的帖子ID路线

Post.js：

我的路由器：

About.js

减速器

1 个答案: