Formik 没有显示在 nextjs 页面上？

Question

I have a "Login" component which has a div with Formik inside it, just some first-last name and email form, there are no errors but the Formik component isn't displaying at all, it is just an empty div, anything else works perfectly.我有一个“登录”组件，其中有一个带有 Formik 的 div，只有一些名字和 email 表单，没有错误，但 Formik 组件根本不显示，它只是一个空 div，其他完美运行。 Here's a piece of code, maybe I am missing something:这是一段代码，也许我遗漏了一些东西：

import Link from "next/link";
import Head from "next/head";
import styles from "../styles/Home.module.css";
import Login from "../components/Login";

export default function Home() {
    return (
        <>
            <Head>
                <title>login page</title>
            </Head>
            <h1>hello</h1>
            <Login />
        </>
    );
}

And the Login component itself:以及登录组件本身：

import { Formik } from "formik";
import { TextField } from "@material-ui/core";

const Login = () => {
    return (
        <div>
            <Formik
                initialValues={{ firstName: "", lastName: "", email: "" }}
                onSubmit={data => {
                    console.log(data);
                }}
            >
                {({ values, handleChange, handleBlur, handleSubmit }) => {
                    <form onSubmit={handleSubmit}>
                        <TextField
                            onChange={handleChange}
                            onBlur={handleBlur}
                            value={values.firstName}
                        />
                        <TextField
                            onChange={handleChange}
                            onBlur={handleBlur}
                            value={values.lastName}
                        />
                        <TextField
                            onChange={handleChange}
                            onBlur={handleBlur}
                            value={values.email}
                        />
                    </form>;
                }}
            </Formik>
        </div>
    );
};

export default Login;

So the <h1>hello</h1> is present on the page, and the empty div which is supposed to have that Login component inside it is present too.所以<h1>hello</h1>出现在页面上，并且应该在其中包含该 Login 组件的空 div 也存在。 What could the problem be?问题可能是什么？ Maybe I am just blind and missing something simple or is there some sort of package problem?也许我只是盲目并且缺少一些简单的东西，或者是否存在某种 package 问题？

Answer 1

You have to return the JSX inside your Formik children callback.您必须在Formik子回调中返回 JSX。

{({ values, handleChange, handleBlur, handleSubmit }) => {
    return (
        <form onSubmit={handleSubmit}>
            <!-- Rest of the form -->
        </form>
    );
}}

Or the shorthand syntax:或简写语法：

{({ values, handleChange, handleBlur, handleSubmit }) => (
    <form onSubmit={handleSubmit}>
        <!-- Rest of the form -->
    </form>
)}

Formik 没有显示在 nextjs 页面上？

问题描述

1 个解决方案

解决方案1
2 已采纳 2021-03-04 18:37:33

Formik 没有显示在 nextjs 页面上？

问题描述

1 个解决方案

解决方案1 2 已采纳 2021-03-04 18:37:33

解决方案1
2 已采纳 2021-03-04 18:37:33