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import React from 'react';
import ReactDOM from 'react-dom';
import { useForm } from 'react-hook-form';
export default function App() {
const {
register,
handleSubmit,
formState: { errors },
} = useForm();
const onSubmit = (data) => {
alert(JSON.stringify(data));
};
const initialValues = {
firstName: 'bill',
lastName: 'luo',
email: 'bluebill1049@hotmail.com',
age: -1,
};
return (
<div className="App">
<form onSubmit={handleSubmit(onSubmit)}>
<div>
<label htmlFor="firstName">First Name</label>
<input
defaultValue={initialValues.firstName}
placeholder="bill"
{...register('firstName', {
validate: (value) => value !== 'bill',
})}
/>
</div>
{errors.firstName && <p>Your name is not bill</p>}
<div>
<label htmlFor="lastName">Last Name</label>
<input
defaultValue={initialValues.lastName}
placeholder="luo"
{...register('lastName', {
validate: (value) => value.length > 3,
})}
/>
</div>
{errors.lastName && <p>Your last name is less than 3 characters</p>}
<div>
<label htmlFor="email">Email</label>
<input
defaultValue={initialValues.email}
placeholder="bluebill1049@hotmail.com"
type="email"
{...register('email')}
/>
</div>
<div>
<label htmlFor="age">Age</label>
<input
defaultValue={initialValues.age}
placeholder="0"
type="text"
{...register('age', {
validate: {
positiveNumber: (value) => parseFloat(value) > 0,
lessThanHundred: (value) => parseFloat(value) < 200,
},
})}
/>
</div>
{errors.age && errors.age.type === 'positiveNumber' && (
<p>Your age is invalid</p>
)}
{errors.age && errors.age.type === 'lessThanHundred' && (
<p>Your age should be less than 200</p>
)}
<button type="submit">Submit</button>
</form>
</div>
);
}
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