react-hook-form validation code example
Example 1: install react hook form
npm install react-hook-form
Example 2: react hooks form
import React from 'react';
import { useForm } from 'react-hook-form';
function App() {
const { register, handleSubmit, errors } = useForm();
const onSubmit = (data) => {
console.log(data);
};
return (
<form onSubmit={handleSubmit(onSubmit)}>
<input name="firstname" ref={register} /> {}
<input name="lastname" ref={register({ required: true })} />
{errors.lastname && 'Last name is required.'}
<input name="age" ref={register({ pattern: /\d+/ })} />
{errors.age && 'Please enter number for age.'}
<input type="submit" />
</form>
);
}
Example 3: npm hook form
import React from 'react';import { useForm } from 'react-hook-form'; function App() { const { register, handleSubmit, errors } = useForm();
Example 4: react hook form
import React from 'react';
import { useForm } from 'react-hook-form';
import "./App.css";
type Profile = {
firstname: string
lastname: string
age: number
}
function App() {
const {register, handleSubmit, errors} = useForm<Profile>()
const onSubmit = handleSubmit((data) => {
alert(JSON.stringify(data))
})
return (
<main>
<form onSubmit={onSubmit}>
<div>
<label htmlFor="firstname">First Name</label>
<input ref={register({ required: true })} id="firstname" name="firstname" type="text"/>
{
errors.firstname && <div className="error">Enter your name</div>
}
</div>
<div>
<label htmlFor="lastname">Last Name</label>
<input ref={register({ required: true })} id="lastname" name="lastname" type="text"/>
{
errors.lastname && <div className="error">Enter your last name</div>
}
</div>
<div>
<label htmlFor="age">Age</label>
<input ref={register({ required: true })} id="age" name="age" type="text"/>
{
errors.age && <div className="error">Enter your age</div>
}
</div>
<button type="submit">Save</button>
</form>
</main>
);
}
export default App;
Example 5: React Hook Form
import React from 'react';
import ReactDOM from 'react-dom';
import { connect } from "react-redux";
import useForm from 'react-hook-form';
function SampleForm() {
const { register, handleSubmit } = useForm();
const onSubmit = data => {
alert(JSON.stringify(data));
};
return (
<div className="App">
<form onSubmit={handleSubmit(onSubmit)}>
<div>
<label htmlFor="firstName">First Name</label>
<input name="firstName" placeholder="bill" ref={register} />
</div>
<div>
<label htmlFor="lastName">Last Name</label>
<input name="lastName" placeholder="luo" ref={register} />
</div>
<div>
<label htmlFor="email">Email</label>
<input name="email" placeholder="[email protected]" type="email" ref={register} />
</div>
<button type="submit">Submit</button>
</form>
</div>
);
}
class Sample extends Component {
constructor(props) {
super(props);
}
render() {
return <SampleForm />;
}
}
export default connect()(Sample);
const rootElement = document.getElementById('root');
ReactDOM.render(<Sample />, rootElement);
Example 6: react hook form
react hook form