javascript - React Hooks 与 React Router v4 - 我如何重定向到另一条路线？

Question

我有一个简单的 React Hooks 应用程序 - Todos 列表 - 带有 React Router v4

在 Todo 列表中，当点击 Todo 时我需要:

1. 在上下文中调度当前的待办事项
2. 重定向到另一条路线(从/todos 到/todos/:id)

在之前基于 React 类的实现中，我可以使用 this.context.history.push 重定向到另一个路由。

我将如何结合使用 React Hooks 和 React Router v4 来处理这个问题(在下面的代码中，请参阅我在函数 editRow() 中的评论)？

代码如下:

=====index.js=====

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

import App from './App';

ReactDOM.render(
    <BrowserRouter>
        <App />
    </BrowserRouter>, document.getElementById('root'));

=====main.js=====

import React from 'react'
import { Switch, Route } from 'react-router-dom'
import TodosList from './todoslist'
import TodosEdit from './todosedit'

const Main = () => (
  <main>
    <Switch>
      <Route exact path="/todos" component={TodosList}/>
      <Route exact path="/todos/:id" component={TodosEdit} />
    </Switch>
  </main>
)

export default Main

=====app.js=====

import React, {useContext, useReducer} from 'react';
import Main from './main'
import TodosContext from './context'
import todosReducer from './reducer'

const App = () => {
  const initialState = useContext(TodosContext);
  const [state, dispatch] = useReducer(todosReducer, initialState);
  return (
    <div>
      <TodosContext.Provider value={{state, dispatch}}>
        <Main/>
      </TodosContext.Provider>
    </div>
  )
}
export default App;

=====TodosContext.js=====

import React from 'react'

const TodosContext = React.createContext({
    todos: [
        {id:1, text:'Get Grocery', complete:false},
        {id:2, text:'Excercise', complete:false},
        {id:3, text:'Drink Water', complete:true},
    ],
    currentTodo: {}
})

export default TodosContext

=====reducer.js=====

import React from 'react'

export default function reducer(state, action){
    switch(action.type){
        case "GET_TODOS":
            return {
                ...state,
                todos: action.payload
            }
        case "SET_CURRENT_TODO":
                   return {
                       ...state,
                       currentTodo: action.payload
            }
        default: 
            return state
    }
}

=====Todos.js=====

import React, {useState, useContext, useEffect} from 'react';
import TodosContext from './context'

function Todos(){   
    const [todo, setTodo] = useState("")
    const {state, dispatch} = useContext(TodosContext)
    useEffect(()=>{
        if(state.currentTodo.text){
            setTodo(state.currentTodo.text)
        } else {
            setTodo("")
        }
        dispatch({
            type: "GET_TODOS",
            payload: state.todos
        })
    }, [state.currentTodo.id])

    const editRow = event =>{
        let destUrlEdit = `/todos/${event.id}`

        let obj = {}
        obj.id = event.id
        obj.text = event.text

        dispatch({type:"SET_CURRENT_TODO", payload: obj})

        //after dispatch I would like to redirect to another route to do the actual edit
        //destUrlEdit
    }
    return(
        <div>
            <h1>List of ToDos</h1>
            <h4>{title}</h4>
            <ul>
                {state.todos.map(todo => (
                    <li key={todo.id}>{todo.text} &nbsp;
                        <button onClick={()=>{
                            editRow(todo)}}>
                        </button>
                    </li>
                ))}
            </ul>
        </div>
    )
}

export default Todos;

Answer 1

它实际上比其他答案简单很多，React Router v5.1 提供了一个 useHistory钩子(Hook)。

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

const MyComponent = () => {
  const history = useHistory()
  const handleButtonClick = (event) => {
    history.push(event.target.value)
  }
  return (
    <button
      type="button"
      value="/my/path"
      onClick={handleButtonClick}
    >
      Navigate Me!
    </button>
  )
}