How to Create a Login and Sign Up Form with HTML, CSS and JavaScript
In this tutorial you'll be building a hybrid Login & Sign Up form using HTML, CSS & JavaScript. This is all very easy to do, and it's all done without a library or framework!
Video Tutorial
Source Code
You can find the source code for this video below. Alternatively, browse it on GitHub.
<!DOCTYPE html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta charset="utf-8">
<title>Login / Sign Up Form</title>
<link rel="shortcut icon" href="/assets/favicon.ico">
<link rel="stylesheet" href="./src/main.css">
</head>
<body>
<div class="container">
<form class="form" id="login">
<h1 class="form__title">Login</h1>
<div class="form__message form__message--error"></div>
<div class="form__input-group">
<input type="text" class="form__input" autofocus placeholder="Username or email">
<div class="form__input-error-message"></div>
</div>
<div class="form__input-group">
<input type="password" class="form__input" autofocus placeholder="Password">
<div class="form__input-error-message"></div>
</div>
<button class="form__button" type="submit">Continue</button>
<p class="form__text">
<a href="#" class="form__link">Forgot your password?</a>
</p>
<p class="form__text">
<a class="form__link" href="./" id="linkCreateAccount">Don't have an account? Create account</a>
</p>
</form>
<form class="form form--hidden" id="createAccount">
<h1 class="form__title">Create Account</h1>
<div class="form__message form__message--error"></div>
<div class="form__input-group">
<input type="text" id="signupUsername" class="form__input" autofocus placeholder="Username">
<div class="form__input-error-message"></div>
</div>
<div class="form__input-group">
<input type="text" class="form__input" autofocus placeholder="Email Address">
<div class="form__input-error-message"></div>
</div>
<div class="form__input-group">
<input type="password" class="form__input" autofocus placeholder="Password">
<div class="form__input-error-message"></div>
</div>
<div class="form__input-group">
<input type="password" class="form__input" autofocus placeholder="Confirm password">
<div class="form__input-error-message"></div>
</div>
<button class="form__button" type="submit">Continue</button>
<p class="form__text">
<a class="form__link" href="./" id="linkLogin">Already have an account? Sign in</a>
</p>
</form>
</div>
<script src="./src/main.js"></script>
</body>
body {
--color-primary: #009579;
--color-primary-dark: #007f67;
--color-secondary: #252c6a;
--color-error: #cc3333;
--color-success: #4bb544;
--border-radius: 4px;
margin: 0;
height: 100vh;
display: flex;
align-items: center;
justify-content: center;
font-size: 18px;
background: url(./background.jpg);
background-size: cover;
}
.container {
width: 400px;
max-width: 400px;
margin: 1rem;
padding: 2rem;
box-shadow: 0 0 40px rgba(0, 0, 0, 0.2);
border-radius: var(--border-radius);
background: #ffffff;
}
.container,
.form__input,
.form__button {
font: 500 1rem 'Quicksand', sans-serif;
}
.form--hidden {
display: none;
}
.form > *:first-child {
margin-top: 0;
}
.form > *:last-child {
margin-bottom: 0;
}
.form__title {
margin-bottom: 2rem;
text-align: center;
}
.form__message {
text-align: center;
margin-bottom: 1rem;
}
.form__message--success {
color: var(--color-success);
}
.form__message--error {
color: var(--color-error);
}
.form__input-group {
margin-bottom: 1rem;
}
.form__input {
display: block;
width: 100%;
padding: 0.75rem;
box-sizing: border-box;
border-radius: var(--border-radius);
border: 1px solid #dddddd;
outline: none;
background: #eeeeee;
transition: background 0.2s, border-color 0.2s;
}
.form__input:focus {
border-color: var(--color-primary);
background: #ffffff;
}
.form__input--error {
color: var(--color-error);
border-color: var(--color-error);
}
.form__input-error-message {
margin-top: 0.5rem;
font-size: 0.85rem;
color: var(--color-error);
}
.form__button {
width: 100%;
padding: 1rem 2rem;
font-weight: bold;
font-size: 1.1rem;
color: #ffffff;
border: none;
border-radius: var(--border-radius);
outline: none;
cursor: pointer;
background: var(--color-primary);
}
.form__button:hover {
background: var(--color-primary-dark);
}
.form__button:active {
transform: scale(0.98);
}
.form__text {
text-align: center;
}
.form__link {
color: var(--color-secondary);
text-decoration: none;
cursor: pointer;
}
.form__link:hover {
text-decoration: underline;
}
function setFormMessage(formElement, type, message) {
const messageElement = formElement.querySelector(".form__message");
messageElement.textContent = message;
messageElement.classList.remove("form__message--success", "form__message--error");
messageElement.classList.add(`form__message--${type}`);
}
function setInputError(inputElement, message) {
inputElement.classList.add("form__input--error");
inputElement.parentElement.querySelector(".form__input-error-message").textContent = message;
}
function clearInputError(inputElement) {
inputElement.classList.remove("form__input--error");
inputElement.parentElement.querySelector(".form__input-error-message").textContent = "";
}
document.addEventListener("DOMContentLoaded", () => {
const loginForm = document.querySelector("#login");
const createAccountForm = document.querySelector("#createAccount");
document.querySelector("#linkCreateAccount").addEventListener("click", e => {
e.preventDefault();
loginForm.classList.add("form--hidden");
createAccountForm.classList.remove("form--hidden");
});
document.querySelector("#linkLogin").addEventListener("click", e => {
e.preventDefault();
loginForm.classList.remove("form--hidden");
createAccountForm.classList.add("form--hidden");
});
loginForm.addEventListener("submit", e => {
e.preventDefault();
// Perform your AJAX/Fetch login
setFormMessage(loginForm, "error", "Invalid username/password combination");
});
document.querySelectorAll(".form__input").forEach(inputElement => {
inputElement.addEventListener("blur", e => {
if (e.target.id === "signupUsername" && e.target.value.length > 0 && e.target.value.length < 10) {
setInputError(inputElement, "Username must be at least 10 characters in length");
}
});
inputElement.addEventListener("input", e => {
clearInputError(inputElement);
});
});
});
If you have any questions about this code, please leave a comment on the video.
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