Created
August 6, 2020 02:06
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import React from 'react'; | |
import { useForm, useFieldArray } from 'react-hook-form'; | |
import { yupResolver } from '@hookform/resolvers'; | |
import * as yup from "yup"; | |
function validateDuplicatedEmail(email) { | |
const { users } = this.from[1].value; | |
if (users.length < 2) return true; | |
let dupCount = 0; | |
for (let i = 0; i < users.length; i += 1) { | |
if (users[i].email === email) { | |
dupCount += 1; | |
if (dupCount > 1) { | |
return false; | |
} | |
} | |
} | |
return true; | |
} | |
const schema = yup.object().shape({ | |
users: yup.array( | |
yup.object().shape({ | |
name: yup.string().required('name is required.'), | |
email: yup | |
.string() | |
.required('email is required.') | |
.email('invalid email type.') | |
.test('email-dup', 'duplicated email', validateDuplicatedEmail) | |
}), | |
), | |
}); | |
function Form() { | |
const { control, register, errors, handleSubmit } = useForm({ | |
mode: 'onBlur', | |
defaultValues: { users: [{ name: '', email: '' }] }, | |
resolver: yupResolver(schema), | |
}); | |
const { fields, append, remove } = useFieldArray({ | |
control, | |
name: 'users', | |
}) | |
const userErrors = errors.users; | |
return ( | |
<form onSubmit={handleSubmit(data => console.log(data))}> | |
<ul> | |
{ | |
fields.map((user, i) => ( | |
<li key={user.id}> | |
<input | |
name={`users[${i}].name`} | |
type="text" | |
defaultValue={user.name} | |
ref={register} | |
/> | |
<input | |
name={`users[${i}].email`} | |
type="text" | |
defaultValue={user.email} | |
ref={register} | |
/> | |
<button | |
type="button" | |
onClick={() => remove(i)} | |
> | |
remove | |
</button> | |
<p style={{ color: 'red' }}> | |
<span> | |
{ userErrors && userErrors[i]?.name?.message } | |
</span> | |
<span> | |
{ userErrors && userErrors[i]?.email?.message } | |
</span> | |
</p> | |
</li> | |
)) | |
} | |
</ul> | |
<button type="button" onClick={() => append({ name: '', email: '' });}>add</button> | |
<button type="submit">submit</button> | |
</form> | |
); | |
} |
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