Probleme beim programmgesteuerten Umleiten zu Routen in React Router v6

Question

Ich möchte bei einigen Benutzeraktionen eine Navigation durchführen, z. B. beim Senden einer Schaltfläche. Angenommen, der Benutzer klickt auf die Schaltfläche „Kontakt hinzufügen“, möchte ich, dass der React-Router auf der Startseite „/“ umleitet. Derzeit stehe ich vor diesem Problem --> TypeError: Cannot readproperties of undefined (reading 'push') würde mich über die Hilfe von Experten sehr freuen.

AddContacts.js

import React, { Component } from "react";
import { Consumer } from "../../context";
import TextInputGroup from "../layout/TextInputGroup";
import { v4 as uuidv4 } from "uuid";
import { useNavigate } from "react-router-dom";

class AddContacts extends Component {
  state = {
    name: "",
    email: "",
    phone: "",
    errors: {},
  };
  onSubmit = (dispatch, e) => {
    e.preventDefault();

    const { name, email, phone } = this.state;

    //Check for errors

    if (name === "") {
      this.setState({ errors: { name: "Name is required" } });
      return;
    }
    if (email === "") {
      this.setState({ errors: { email: "Email is required" } });
      return;
    }
    if (phone === "") {
      this.setState({ errors: { phone: "Phone is required" } });
      return;
    }

    const newContact = {
      id: uuidv4(),
      name,
      email,
      phone,
    };
    dispatch({ type: "ADD_CONTACT", payload: newContact });

    this.setState({
      name: "",
      email: "",
      phone: "",
      errors: {},
    });
    this.props.navigate.push("/");
  };

  onChange = (e) => this.setState({ [e.target.name]: e.target.value });
  render() {
    const { name, email, phone, errors } = this.state;

    return (
      <Consumer>
        {(value) => {
          const { dispatch } = value;

          return (
            <div className="card mb-3">
              <div className="card-header">Add Contacts</div>
              <div className="card-body">
                <form onSubmit={this.onSubmit.bind(this, dispatch)}>
                  <TextInputGroup
                    label="Name"
                    name="name"
                    placeholder="Enter Name..."
                    value={name}
                    onChange={this.onChange}
                    error={errors.name}
                  />
                  <TextInputGroup
                    label="Email"
                    name="email"
                    type="email"
                    placeholder="Enter Email..."
                    value={email}
                    onChange={this.onChange}
                    error={errors.email}
                  />
                  <TextInputGroup
                    label="Phone"
                    name="phone"
                    placeholder="Enter Phone..."
                    value={phone}
                    onChange={this.onChange}
                    error={errors.phone}
                  />
                  <input
                    type="submit"
                    value="Add Contact"
                    className="btn btn-light btn-block mt-3"
                  />
                </form>
              </div>
            </div>
          );
        }}
      </Consumer>
    );
  }
}

export default AddContacts;

Dies ist die App.js-Datei

import React, { Component } from "react";
import { BrowserRouter, Routes, Route, Link } from "react-router-dom";

import Contacts from "./components/contacts/Contacts";
import Header from "./components/layout/Header";
import AddContacts from "./components/contacts/AddContacts";
import About from "./components/pages/About";

import { Provider } from "./context";

import "bootstrap/dist/css/bootstrap.min.css";
import "./App.css";

function App() {
  return (
    <Provider>
      <BrowserRouter>
        <div className="App">
          <Header branding="Contact manager" />
          <div className="container">
            <Routes>
              <Route path="/" element={<Contacts />} />{" "}
              <Route path="/contact/add/*" element={<AddContacts />} />{" "}
              <Route path="about/*" element={<About />} />{" "}
            </Routes>{" "}
          </div>{" "}
        </div>{" "}
      </BrowserRouter>{" "}
    </Provider>
  );
}

export default App;

Answer 1

如何在 React Router v6 中重定向

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

  const navigate = useNavigate();
  
  const handleClick = () => {
    navigate("/dashboard");
  };

Answer 2

问题

这是因为您尝试从不存在的 navigate 属性进行导航，它是未定义的。

this.props.navigate.push("/");

useNavigate 挂钩仅与函数组件兼容，因此如果您想要/需要将 navigate 与类组件一起使用，则必须转换 AddContacts 到函数组件，或者滚动您自己的自定义 withRouter 高阶组件来注入“路由道具”，例如来自 react-router-dom 的 withRouter HOC v5.x 做到了。

解决方案

我不会介绍如何将类组件转换为函数组件。下面是一个自定义 withRouter HOC 示例：

const withRouter = WrappedComponent => props => {
  const navigate = useNavigate();
  // etc... other react-router-dom v6 hooks

  return (
    <WrappedComponent
      {...props}
      navigate={navigate}
      // etc...
    />
  );
};

并使用新的 HOC 装饰 AddContacts 组件。

export default withRouter(AddContacts);

现在会将 navigate 属性（以及您设置的任何其他属性）传递给装饰组件，并且 this.navigate 现在将已定义。

此外，导航 API 从 v5 更改为 v6，不再使用直接的 history 对象。 navigate 是一个函数而不是一个对象。要使用您调用函数并传递 1 或 2 个参数，第一个是目标路径，第二个是带有 replace 和/或 state 键的可选“选项”对象/值。

现在导航如下：

this.props.navigate("/");