Router 6/ and the difference with router5

React Router 6 Quick start

1. summary

React Router Publish to... In three different packages npm On , They are ：

react-router: The core library of routing , A lot of ： Components 、 hook .
react-router-dom: contain react-router All contents , And add some dedicated to DOM The components of , for example etc. .
react-router-native: Include react-router All contents , And add some dedicated to ReactNative Of API, for example : etc. .
And React Router 5.x Version comparison , What has changed ？

Changes in built-in components ： remove , newly added etc. .

Changes in grammar ：component={About} Turn into element={} etc. .

Add more hook：useParams、useNavigate、useMatch etc. .

The official clearly recommends functional components ！！！

…

2.Component

1. <BrowserRouter>

1. explain ：<BrowserRouter> Used to wrap the entire application .
2. Sample code ：

import React from "react";
import ReactDOM from "react-dom";
import { BrowserRouter } from "react-router-dom";

ReactDOM.render(
  <BrowserRouter>
    {/*  The overall structure （ Usually it is App Components ） */}
  </BrowserRouter>,root
);

2. explain ： Same function as , But the change is in the address bar hash value . remarks ：6.x In the version 、 The usage and 5.x identical .
3. And
   v6 The previous... Has been removed from the version , New substitutes have been introduced ：.

and To be used in conjunction with , And must be wrapped .

Equivalent to one if sentence , If its path is the same as the current URL matching , Then its corresponding component .

Property is used to specify ： Whether matching is case sensitive （ The default is false）.

When URL When something changes , Will see all its children Element to find the best match and render the component .

You can also nest , And can cooperate useRoutes() To configure “ Routing table ” , But it needs to go through Component to render its child routes .

Sample code ：

<Routes>
    /*path Property is used to define the path ,element Property is used to define the component corresponding to the current path */
    <Route path="/login" element={<Login />}></Route>

		/* Used to define nested routes ,home It's level 1 routing , The corresponding path /home*/
    <Route path="home" element={<Home />}>
       /*test1  and  test2  It's secondary routing , The corresponding path is /home/test1  or  /home/test2*/
      <Route path="test1" element={<Test/>}></Route>
      <Route path="test2" element={<Test2/>}></Route>
		</Route>
	
		//Route Or not element attribute ,  This is used to show nested routes  . The corresponding path is /users/xxx
    <Route path="users">
       <Route path="xxx" element={<Demo />} />
    </Route>
</Routes>

4. <Link>

1. effect : modify URL, And do not send network requests （ Routing links ）.
2. Be careful : The outside needs to be <BrowserRouter> or <HashRouter> The parcel .
3. Sample code ：

import { Link } from "react-router-dom";

function Test() {
  return (
    <div>
    	<Link to="/ route "> Button </Link>
    </div>
  );
}

5. <NavLink>

1. effect : And <Link> Similar components , And can realize navigation “ The highlighted ” effect .
2. Sample code ：

//  Be careful : NavLink The default class name is active, The following is the specified custom class

// Custom style 
<NavLink
    to="login"
    className={({ isActive }) => {
        console.log('home', isActive)
        return isActive ? 'base one' : 'base'
    }}
>login</NavLink>

/*
	 By default , When Home The sub components of are matched successfully ,Home Your navigation will also highlight ,
	 When NavLink To add the end After attribute , if Home The sub components of are matched successfully , be Home Navigation has no highlight effect .
*/
<NavLink to="home" end >home</NavLink>

6. <Navigate>

1. effect ： as long as <Navigate> Component is rendered , Will modify the path , Switch views .
2. replace Property is used to control the jump mode （push or replace, The default is push）.
3. Sample code ：

import React,{useState} from 'react'
import {Navigate} from 'react-router-dom'

export default function Home() {
	const [sum,setSum] = useState(1)
	return (
		<div>
			<h3> I am a Home The content of </h3>
			{/*  according to sum The value of determines whether to switch views  */}
			{sum === 1 ? <h4>sum The value of is {sum}</h4> : <Navigate to="/about" replace={true}/>}
			<button onClick={()=>setSum(2)}> Point I will sum Turn into 2</button>
		</div>
	)
}

7. <Outlet>

1. When <Route> When nesting occurs , Render its corresponding subsequent sub routes .
2. Sample code ：

// Generate corresponding routing rules according to the routing table 
const element = useRoutes([
  {
    path:'/about',
    element:<About/>
  },
  {
    path:'/home',
    element:<Home/>,
    children:[
      {
        path:'news',
        element:<News/>
      },
      {
        path:'message',
        element:<Message/>,
      }
    ]
  }
])

//Home.js
import React from 'react'
import {NavLink,Outlet} from 'react-router-dom'

export default function Home() {
	return (
		<div>
			<h2>Home Component content </h2>
			<div>
				<ul className="nav nav-tabs">
					<li>
						<NavLink className="list-group-item" to="news">News</NavLink>
					</li>
					<li>
						<NavLink className="list-group-item" to="message">Message</NavLink>
					</li>
				</ul>
				{/*  Specify the location where the routing component is rendered  */}
				<Outlet />
			</div>
		</div>
	)
}

3.Hooks

1. useRoutes()

1. effect ： According to the routing table , Dynamically create <Routes> and <Route>.
2. Sample code

// Routing table configuration ：src/routes/index.js
import About from '../pages/About'
import Home from '../pages/Home'
import {Navigate} from 'react-router-dom'

export default [
	{
		path:'/about',
		element:<About/>
	},
	{
		path:'/home',
		element:<Home/>
	},
	{
		path:'/',
		element:<Navigate to="/about"/>
	}
]

//App.jsx
import React from 'react'
import {NavLink,useRoutes} from 'react-router-dom'
import routes from './routes'

export default function App() {
	// Generate corresponding routing rules according to the routing table 
	const element = useRoutes(routes)
	return (
		<div>
			......
      {/*  Registered routing  */}
      {element}
		  ......
		</div>
	)
}

2. useNavigate()

1. effect ： Returns a function used to implement programmatic navigation .
2. Sample code ：

import React from 'react'
import {useNavigate} from 'react-router-dom'

export default function Demo() {
  const navigate = useNavigate()
  const handle = () => {
    // The first way to use it ： Specify the specific path 
    navigate('/login', {
      replace: false,
      state: {a:1, b:2}
    }) 
    // The second way to use it ： Pass in a value to move forward or backward , Be similar to 5.x Medium  history.go() Method 
    navigate(-1)
  }
  
  return (
    <div>
      <button onClick={
        handle}> Button </button>
    </div>
  )
}

3. useParams()

1. effect ： Returns the current matching route params Parameters , Be similar to 5.x Medium match.params.
2. Sample code ：

import React from 'react';
import { Routes, Route, useParams } from 'react-router-dom';
import User from './pages/User.jsx'

function ProfilePage() {
  //  obtain URL Brought from params Parameters 
  let { id } = useParams();
}

function App() {
  return (
    <Routes>
      <Route path="users/:id" element={<User />}/>
    </Routes>
  );
}

4. useSearchParams()

1. effect ： Used to read and modify the current position URL The query string in .
2. Returns an array containing two values , The contents are ： Current seaech Parameters 、 to update search Function of .
3. Sample code ：

import React from 'react'
import {useSearchParams} from 'react-router-dom'

export default function Detail() {
	const [search,setSearch] = useSearchParams()
	const id = search.get('id')
	const title = search.get('title')
	const content = search.get('content')
	return (
		<ul>
			<li>
				<button onClick={()=>setSearch('id=008&title= ha-ha &content= Hee hee ')}> Click me to update the received search Parameters </button>
			</li>
			<li> Message number ：{id}</li>
			<li> Message title ：{title}</li>
			<li> The message content ：{content}</li>
		</ul>
	)
}

5. useLocation()

1. effect ： Get current location Information , For standard 5.x Of the routing component in location attribute .
2. Sample code ：

import React from 'react'
import {useLocation} from 'react-router-dom'

export default function Detail() {
	const x = useLocation()
	console.log('@',x)
  // x Namely location object : 
	/*
		{
      hash: "",
      key: "ah9nv6sz",
      pathname: "/login",
      search: "?name=zs&age=18",
      state: {a: 1, b: 2}
    }
	*/
	return (
		<ul>
			<li> Message number ：{id}</li>
			<li> Message title ：{title}</li>
			<li> The message content ：{content}</li>
		</ul>
	)
}

6. useMatch()

1. effect ： Return the current matching information , For standard 5.x Of the routing component in match attribute .
2. Sample code ：

<Route path="/login/:page/:pageSize" element={<Login />}/>
<NavLink to="/login/1/10"> Sign in </NavLink>

export default function Login() {
  const match = useMatch('/login/:x/:y')
  console.log(match) // Output match object 
  //match The object contents are as follows ：
  /*
  	{
      params: {x: '1', y: '10'}
      pathname: "/LoGin/1/10"  
      pathnameBase: "/LoGin/1/10"
      pattern: {
      	path: '/login/:x/:y', 
      	caseSensitive: false, 
      	end: false
      }
    }
  */
  return (
  	<div>
      <h1>Login</h1>
    </div>
  )
}

7. useInRouterContext()
   effect ： If the component is in In the context of , be useInRouterContext The hook returns true, Otherwise return to false.

8. useNavigationType()
   effect ： Returns the current navigation type （ How users come to the current page ）.
   Return value ：POP、PUSH、REPLACE.
   remarks ：POP It means that the routing component is directly opened in the browser （ Refresh the page ）.

9. useOutlet()
   effect ： Used to render nested routes rendered in the current component .

Sample code ：

const result = useOutlet()
console.log(result)
//  If the nested route is not mounted , be result by null
//  If the nested route is already mounted , Show nested routing objects 

10.useResolvedPath()

1. effect ： Given a URL value , Analyze the ：path、search、hash value .

6 and 5 The difference between

Differences between nested routes

5 The middle road is used by Switch ,6 of use Route Instead .

5 The parent component in the declares the child route ：

<Switch>
    <Route path="/about/one" element={<One />}></Route>
    <Route path="/about/two" element={<Two />}></Route>
    <Route path="/about/three" element={<Three />}></Route>
<Switch />*/}

6 The parent component in the declares the child route

<Routes>
    <Route path="one" element={<One />}></Route>
<Route path="two" element={<Two />}></Route>
<Route path="three" element={<Three />}></Route>
</Routes>

Note that there , If the nested route is written in the parent route , Then pay attention to distinguish between react5 The difference between . stay react-router5 in . Matching of parent routes /about Don't omit , And in App.js Where the parent component of Route Of path You don't need to write in Chinese *

The following passage is in 6 If a child component is declared in the parent component in ,App.js Where the parent component of Route Of path Do not write in * A warning will appear :

        router.ts:11 You rendered descendant <Routes> (or called `useRoutes()`) at "/about" (under <Route path="/about">) 
          but the parent route path has no trailing "*". This means if you navigate deeper, the parent won't match anymore and therefore the child routes will never render.
          Please change the parent <Route path="/about"> to <Route path="/about/*">