Question

我有一个简单的react hooks应用程序-Todos列表-带有react router v4

在待办事项列表上，单击待办事项时，我需要：

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

在以前的基于React Class的实现中，我可以使用this.context.history.push重定向到另一条路由。

我将如何结合使用React Hooks和React Router v4来处理这一问题（在下面的代码中，请参见我在函数editRow（）中的注释）？

以下代码：

===== 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

实际上，它比其他答案要简单得多，React Router v5.1提供了一个useHistory钩子。

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>
  )
}

Answer 2

您的问题与使用react-router-v4而不是带有钩子的程序化导航有关，

在react-router-v4中，如果Todos组件以子代或Route的形式呈现，则可以从props获取历史记录，也可以从Route呈现的祖先那里获得Routers的历史记录。但是，它没有收到路由器道具，您可以使用withRouter的{{1}} HOC来获取路由器道具并呼叫react-router

props.history.push(destUrlEdit)

Answer 3

使用react-redux和connected-react-router ...

import {useDispatch } from 'react-redux';
import { push } from 'connected-react-router';

export default () => {
 const dispatch = useDispatch();

 return (
   <Button onClick={() => dispatch(push('/login'))}>
     Login
   </Button>    
  );
};

使用React Router v4的React Hooks-如何重定向到另一条路由？

3 个答案: