在 React Router v6 中嘗試重新導向時如何解決「TypeError: Cannot Read Properties of Undefined (reading \'push\')\」？

使用React Router v6 以程式設計方式導覽：解決TypeError

問題

遇到錯誤訊息「TypeError: 無法讀取未定義的屬性（讀取'push'） ')" 在使用者操作（例如點擊提交按鈕）後嘗試重定向時。這表示用於重定向的導航屬性未定義。

解

1。轉換為函數元件

使用 useNavigate 鉤子在函數元件內進行導航。此鉤子僅相容於函數組件。

2.為類別組件建立自訂HOC

自訂withRouter HOC:

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

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

裝飾類元件:

export default withRouter(AddContacts);

裝飾類元件:

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

3。使用 Navigate 函數

使用 navigate 函數進行導航，而不是先前版本的 React Router 中使用的歷史物件。語法已更改為：

import React, { Component } from "react";
import { Consumer } from "../../context";
import TextInputGroup from "../layout/TextInputGroup";
import { v4 as uuidv4 } from "uuid";
import withRouter from "./withRouter"; // Custom HOC

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("/"); // Navigate using custom HOC
  };

  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 withRouter(AddContacts); // Export wrapped component

AddContacts.js 的完整工作代碼：

此解決方案允許從React Router v6 中的類別組件進行導航，儘管最初的錯誤表明未定義的導航道具。

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