每当React Formik中出现错误时，就会改变现有输入字段的样式。

Question

在我使用React Formik库创建的React Form中，我想将输入元素的边框颜色的样式改为 1px solid red 每当有一个错误时，就会出现一个新的错误组件。

但是我们知道，react formik每当发现一个新的验证错误时，都会使用ErrorMessage渲染一个新的错误组件，所以基本上我们如何对我们的 现有输入栏 错误发生时的颜色？

.formGroup input {
  width: 100%;
  border: none;
  border-bottom: 1px solid black;
}
.formGroup input:focus {
  outline: none;
}
.formGroup button {
  background-color: antiquewhite;
  border-radius: 3px;
  border: none;
  font-size: 15px;
  padding: 10px;
}
.error {
  color: red;
  text-align: start;
  font-size: 13px;
}

代码。

import React, { Component } from "react";
import classes from "./P.module.css";
import { NavLink } from "react-router-dom";
import { Formik, Form, Field, ErrorMessage } from "formik";
import * as Yup from "yup";
const initialValues = {
  company_name: "",
  company_profile: "The Opinia is news and media company",
  location: "",
  phone_number: "",
  email: "",
  gst: "",
};

const onSubmit = (values) => {
  console.log("Form Data: ", values);
};

// for validation
const validationSchema = Yup.object({
  company_name: Yup.string().required("Required"),
  company_profile: Yup.string().required("Required"),
  location: Yup.string().required("Required"),
  email: Yup.string().required("Required").email("Invalid email format"),
  phone_number: Yup.number().required("Required"),
  gst: Yup.string().required("Required"),
});
export default function Projects2(props) {
  return (
    <div className={classes.main}>
      <Formik
        initialValues={initialValues}
        validationSchema={validationSchema}
        onSubmit={onSubmit}
      >
        <Form className={classes.form}>
          <div className={`${classes.formGroup}`}>
            <label htmlFor="company_name">Company Name</label>
            <Field type="text" id="company_name" name="company_name" />
            <ErrorMessage name="company_name" component={TextError} />
          </div>
          <div className={classes.formGroup}>
            <label htmlFor="company_profile">Company Profile</label>
            <Field type="text" id="company_profile" name="company_profile" />
            <ErrorMessage name="company_profile" component={TextError} />
          </div>
          <div className={classes.formGroup}>
            <label htmlFor="location">Location</label>
            <Field type="text" id="location" name="location" />
            <ErrorMessage name="location" component={TextError} />
          </div>
          <div className={classes.formGroup}>
            <label htmlFor="phone_number">Phone</label>
            <Field type="number" id="phone_number" name="phone_number" />
            <ErrorMessage name="phone_number" component={TextError} />
          </div>
          <div className={classes.formGroup}>
            <label htmlFor="email">Email</label>
            <Field type="email" id="email" name="email" />
            <ErrorMessage name="email" component={TextError} />
          </div>
          <div className={classes.formGroup}>
            <label htmlFor="gst">GST Number</label>
            <Field type="text" id="gst" name="gst" />
            <ErrorMessage name="gst" component={TextError} />
          </div>

          <div className={classes.formGroup}>
            <button type="submit">Submit</button>
          </div>
        </Form>
      </Formik>
    </div>
  );
}

export function TextError(props) {
  return <div className={classes.error}>{props.children}</div>;
}

Answer 1

你可以使用react formik fastfields来通过react js表单执行valdiation。