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React - simple register form

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Dirask JS Member
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In this article, we would like to show you how to create a nicely styled simple register form in React.

Simple register user form in React.
Simple register user form in React.

The whole structure of the example consists of the Field component, which will serve as a reusable code, and the Form, which puts it all together.

In our case, the style property was used for styling.
To get the values entered by the user in the inputs, we used the useRef hook, with which we can easily obtain a handle to a DOM element and retrieve the current value.

Using these values, we build an object that we can then send to the server after handling onSubmit.
To prevent the page reloading when onSubmit event occurs, we explicitly called preventDefault() method.

By default, ref property is reserved by React, so we should use the forwardRef function.

Runnable example: 

// ONLINE-RUNNER:browser;

// Note: Uncomment import lines during working with JSX Compiler.
// import React from 'react';
// import ReactDOM from 'react-dom';

const appStyle = {
	height: '350px',
  	display: 'flex'
};

const formStyle = {
    margin: 'auto',
    padding: '10px',
    border: '1px solid #c9c9c9',
    borderRadius: '5px',
    background: '#f7fdf8',
    width: '220px',
  	overflow: 'hidden'
};

const messageStyle = {
  	margin: '-12px -12px 10px',
    padding: '15px 16px 10px',
    borderBottom: '1px solid #ffcccc',
    background: '#ffe0e0',
    fontSize: '14px',
    color: 'red'
}

const labelStyle = {
    margin: '10px 0 5px 0',
    fontFamily: 'Arial, Helvetica, sans-serif',
    fontSize: '15px',
};

const inputStyle = {
    margin: '5px 0 10px 0',
    padding: '5px',
    border: '1px solid #bfbfbf',
    borderRadius: '3px',
    boxSizing: 'border-box',
    width: '100%'
};

const submitStyle = {
    margin: '10px 0 0 0',
    padding: '7px 10px',
    border: '1px solid #efffff',
    borderRadius: '3px',
    background: '#3085d6',
    width: '100%',
    fontSize: '15px',
    color: 'white',
    display: 'block'
};

const Field = React.forwardRef(({label, type}, ref) => {
    return (
      <div>
        <label style={labelStyle} >{label}</label>
        <input ref={ref} type={type} style={inputStyle} />
      </div>
    );
});

const Form = ({onSubmit}) => {
    const usernameRef = React.useRef();
    const emailRef = React.useRef();
    const passwordRef = React.useRef();
    const passwordConfirmationRef = React.useRef();
    const [errorMessage, setErrorMessage] = React.useState();
    const handleSubmit = e => {
        e.preventDefault();
        if (passwordRef.current.value === passwordConfirmationRef.current.value) {
            setErrorMessage(null);
            const data = {
                username: usernameRef.current.value,
                email: emailRef.current.value,
                password: passwordRef.current.value
            };
            onSubmit(data);
        } else {
          	setErrorMessage('Typed passwords are different.');
        }
    };
    return (
      <form style={formStyle} onSubmit={handleSubmit} >
        {errorMessage && <div style={messageStyle}>{errorMessage}</div>}
        <Field ref={usernameRef} label="Username:" type="text" />
        <Field ref={emailRef} label="Email:" type="text" />
        <Field ref={passwordRef} label="Password:" type="password" />
        <Field ref={passwordConfirmationRef} label="Confirm password:" type="password" />
        <div>
          <button style={submitStyle} type="submit">Register</button>
        </div>
      </form>
    );
};

// Usage example:

const App = () => {
  const handleSubmit = data => {
	  const json = JSON.stringify(data, null, 4);
	  console.clear();
	  console.log(json);
  };
  return (
	<div style={appStyle}>
	  <Form onSubmit={handleSubmit} />
	</div>
  );
};

const root = document.querySelector('#root');
ReactDOM.render(<App />, root );

ReactJS

React - register form
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