React路由器dom将数据从父组件传递到子路由器组件不通过props.match [英] React router dom passing data from parent component to child router component does not pass the props.match

问题描述

父组件App.js的内容:-

import React, { useEffect, useState } from "react";从./components/NavBar"导入导航栏；从./pages/Signup"导入注册；从./pages/Home"导入主页；从./pages/Book"导入图书；功能应用(){const [user, setUser] = useState();useEffect(() => {const token = "Bearer";+ sessionStorage.getItem(令牌");如果(令牌){公理.get(process.env.REACT_APP_API_URL +用户/自我"，{标题:{授权:令牌，内容类型":应用程序/json"，},}).then((res) => setUser(res.data));}}, []);返回 (<div className="container-fluid"><NavBar user={user}/><路由精确路径=/";组件={Home}/><路由路径="/signup";组件={注册}/><路由精确路径="/book/:id";组件={() =><Book user={user}/>}/>

);}导出默认应用程序；

对于路线:-

<路由精确路径=/book/:id"组件={() =><Book user={user}/>}/>

当我将组件值从 component={Book} 设置为 component={() =>我有一个错误:-

<块引用>

TypeError: 无法读取未定义的属性 'params'

那是因为我使用的是props.match.params.id"在 Book 组件中.

如何将带有 props.match 的用户状态传递给 Book 组件?

解决方案

component prop 不是函数.使用 render 而不是 component 属性.

render prop 是一个函数，路由器 props 对象作为参数传递给它.您可以将这些路由器道具传递给您的组件.

<路由精确路径=/book/:id"渲染={(道具)=><Book user={user} {...props}/>}/>

请参阅 react 路由器文档，了解有关 渲染道具

Content of the parent component App.js:-

import React, { useEffect, useState } from "react";
import NavBar from "./components/NavBar";
import Signup from "./pages/Signup";
import Home from "./pages/Home";
import Book from "./pages/Book";

function App() {
  const [user, setUser] = useState();
  useEffect(() => {
    const token = "Bearer " + sessionStorage.getItem("token");
    if (token) {
      axios
        .get(process.env.REACT_APP_API_URL + "user/self", {
          headers: {
            Authorization: token,
            "Content-Type": "application/json",
          },
        })
        .then((res) => setUser(res.data));
    }
  }, []);

  return (
    <div className="container-fluid">
      <NavBar user={user} />
      <Route exact path="/" component={Home} />
      <Route path="/signup" component={Signup} />
      <Route exact path="/book/:id" component={() => <Book user={user} />} />
    </div>
  );
}

export default App;

For the route :-

<Route exact path="/book/:id" component={() => <Book user={user} />} />

when i set the component value from component={Book} to component={() => i got an error :-

TypeError: Cannot read property 'params' of undefined

That is because i am using "props.match.params.id" inside the Book component.

How can i pass user state with props.match to he Book component ?

解决方案

component prop isn't a function. Use render instead of component prop.

render prop is a function to which router props object is passed as an argument. You can pass these router props to your component.

<Route exact path="/book/:id" render={(props) => <Book user={user} {...props} />} />

See react router docs for details on render prop

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