如何使用react-hook-form和useFieldArray在动态表单上使用yup验证

Question

我正在尝试使用react-hook-form 的钩子创建一个动态表单useFieldArray。用户应该能够添加或删除字段，从而使其动态化。我查看了本教程以获取灵感，但缺少的部分是如何对状态实现错误验证，这将是一个对象数组：{email: string}[]。（该对象将采用更多键/值对。为了简单起见，我省略了其余部分。）

我尝试过使用yup作为验证模式。它看起来像这样：

const schema = yup.array().of(
  yup.object().shape({
    email: yup.string().email().required(),
  }),
)

React-hook-form 的实现是：

import * as yup from 'yup'
import { yupResolver } from '@hookform/resolvers/yup'
import { useForm, useFieldArray, Controller } from 'react-hook-form'

const { register, control, handleSubmit, errors } = useForm({
  resolver: yupResolver(schema),
  mode: 'onChange',
})
const { fields, append, remove } = useFieldArray({
  control,
  name: 'users',
})

该表格或多或少是根据上面链接中的教程进行的。

error当控制台从钩子记录对象时useForm，它始终给出一个空对象{}。看起来好像不起作用。我可能在这里遗漏了一些东西。问题是什么？

Answer 1

React Hook 表单 v7

是的，动态字段反应钩子形式 - useFieldArray

import { string, object, array } from 'yup';

const formSchema = {
  name: string().required("Name is required").min(7, 'Message'),
};

const schema = object({
  test: array()
   .of(object().shape(formSchema))
});

export default schema;

const methods = useForm({
  resolver: yupResolver(schema),
});

显示错误

<div style={{ fontSize: 14 }}>{errors?.test?.[index]?.name?.message}</div>

Answer 2

也许您想使用context参数来切换您的模式？

Context：这个上下文对象是可变的，将被注入到解析器的第二个参数或 Yup 验证的上下文对象中。

import * as React from "react";
import { useForm } from "react-hook-form";
import * as Joi from "joi";

const validationSchema1 = Joi.object({
  username: Joi.string()
    .alphanum()
    .min(3)
    .max(30)
    .required()
});

const validationSchema2 = Joi.object({
  username: Joi.string()
    .alphanum()
    .min(3)
    .max(30)
    .required()
});

const App = () => {
  const [schemaContext, setSchemaContext] = useState({ schemaA: false })
  const { register, handleSubmit, errors } = useForm({
    context: schemaContext, // use the context switch here
    resolver: async (data, context) => {
      const { error, value: values } = context.is1 ? validationSchema1.validate(data, {
        abortEarly: false
      }) : validationSchema2.validate(data, {
        abortEarly: false
      });

      return {
        values: error ? {} : values,
        errors: error
          ? error.details.reduce((previous, currentError) => {
              return {
                ...previous,
                [currentError.path[0]]: currentError
              };
            }, {})
          : {}
      };
    }
  });

  const onSubmit = data => {
    console.log(data)
  };

  return (
    <div className="App">
      <h1>resolver</h1>
      
      <form onSubmit={handleSubmit(onSubmit)}>
        <label>Username</label>
        <input type="text" name="username" ref={register} />
        {errors.username && <p>errors.username.message</p>}
        <input type="submit" />
      </form>
    </div>
  );
};