SignupPage.js

import React, { useState } from 'react';
import { Field, Formik } from 'formik';
import * as Yup from 'yup';
import axios from 'axios';
import 'bootstrap/dist/css/bootstrap.css';
import { Link, Redirect } from 'react-router-dom';

function Signup() {
    const [state, setState] = useState(false);

    if (state) {
        return <Redirect to="/login" />;
    }

    return (
        <div className="d-flex flex-column justify-content-between vh-100">
            <Formik
                initialValues={{ name: '', id: '', password: '', password2: '', question: '', answer: '' }}
                validationSchema={Yup.object({
                    name: Yup.string()
                        .required('이름을 입력해주세요.'),
                    id: Yup.string()
                        .required('학번을 입력해주세요.'),
                    password: Yup.string()
                        .required('비밀번호를 입력해주세요.')
                        .min(8, '8자 이상 입력해주세요.'),
                    password2: Yup.string()
                        .required('비밀번호를 다시 입력해주세요.')
                        .min(8, '8자 이상 입력해주세요.')
                        .oneOf([Yup.ref("password"), null], '비밀번호가 일치하지 않습니다.'),
                    answer: Yup.string()
                        .required('답변을 입력해주세요.'),
                })}
                onSubmit={(values, { setSubmitting }) => {
                    axios({
                        method: 'post',
                        url: '/users',
                        data: values,
                    }).then(res => {
                        if (res.status === 404) return alert(res.data.error)
                        alert("회원가입이 완료되었습니다!")

                        setState(true);
                    })
                        .catch(err => {
                            alert(err.error)
                        });

                    setTimeout(() => {
                        setSubmitting(false);
                    }, 400);  // finish the cycle in handler
                }}
            >
                {({
                    errors,
                    touched,
                    handleSubmit,
                    getFieldProps,  // contain values, handleChange, handleBlur
                    isSubmitting,
                }) => (
                        <div className="row justify-content-center align-items-center">
                            <form onSubmit={handleSubmit} className="col-sm-3">
                                <div className="form-group mb-4">
                                    <input
                                        className={(touched.name && errors.name ? 'form-control is-invalid' : "form-control")}
                                        type="text"
                                        name="name"
                                        {...getFieldProps('name')}
                                        placeholder="이름" />
                                    {touched.name && errors.name ? (
                                        <div className="invalid-feedback text-left">{errors.name}</div>
                                    ) : null}
                                </div>
                                <div className="form-group mb-4">
                                    <input
                                        className={(touched.id && errors.id ? 'form-control is-invalid' : "form-control")}
                                        type="text"
                                        name="id"
                                        {...getFieldProps('id')}
                                        placeholder="학번/교번"
                                    />
                                    {touched.id && errors.id ? (
                                        <div className="invalid-feedback text-left">{errors.id}</div>
                                    ) : null}
                                </div>
                                <div className="form-group mb-4">
                                    <input
                                        className={(touched.password && errors.password ? 'form-control is-invalid' : "form-control")}
                                        type="password"
                                        name="password"
                                        {...getFieldProps('password')}
                                        placeholder="비밀번호"
                                    />
                                    {touched.password && errors.password ? (
                                        <div className="invalid-feedback text-left">{errors.password}</div>
                                    ) : null}
                                </div>
                                <div className="form-group mb-4">
                                    <input
                                        className={(touched.password2 && errors.password2 ? 'form-control is-invalid' : "form-control")}
                                        type="password"
                                        name="password2"
                                        {...getFieldProps('password2')}
                                        placeholder="비밀번호 확인"
                                    />
                                    {touched.password2 && errors.password2 ? (
                                        <div className="invalid-feedback text-left">{errors.password2}</div>
                                    ) : null}
                                </div>
                                <div className="form-group mb-4">
                                    <label>본인 확인 질문</label>
                                    <Field as="select" name="question">
                                        <option value="">질문을 선택하세요</option>
                                        <option value="life">자신의 인생 좌우명은?</option>
                                        <option value="school">자신이 다녔던 초등학교의 이름은?</option>
                                        <option value="place">기억에 남는 추억의 장소는?</option>
                                    </Field>
                                </div>
                                <div className="form-group mb-4">
                                    <input
                                        className={(touched.answer && errors.answer ? 'form-control is-invalid' : "form-control")}
                                        type="text"
                                        name="answer"
                                        {...getFieldProps('answer')}
                                        placeholder="Input answer" />
                                    {touched.answer && errors.answer ? (
                                        <div className="invalid-feedback text-left">{errors.answer}</div>
                                    ) : null}
                                </div>
                                <button type="submit" className="btn btn-dark" disabled={isSubmitting}>
                                    Sign Up
                                </button>
                                <button class="btn btn-light"><Link to="/login">로그인</Link></button>
                                <button class="btn btn-light"><Link to="/">홈</Link></button>
                            </form>
                        </div>
                    )}
            </Formik>
        </div>
    );
}


export default Signup;