Real-Time Password Validation Using HTML5, Regex, and JavaScript
Last updated 2 weeks, 4 days ago | 33 views 75 5
First page link: HTML5 Password Validation with Regular Expressions: A Complete Guide
Great! Let’s enhance the previous HTML5 password form with real-time validation using JavaScript. This improves UX by giving instant feedback as the user types, without waiting until form submission.
Real-Time Password Validation Using HTML5, Regex, and JavaScript
We’ll use the same regex rules:
-
At least 8 characters
-
At least one uppercase letter
-
At least one lowercase letter
-
At least one number
-
At least one special character
✅ Full Enhanced Example with Real-Time Feedback
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Real-Time Password Validation</title>
<style>
input {
padding: 8px;
width: 300px;
font-size: 14px;
}
.feedback {
font-size: 13px;
margin-top: 5px;
}
.valid {
color: green;
}
.invalid {
color: red;
}
.rules {
font-size: 13px;
margin-top: 10px;
}
</style>
</head>
<body>
<h2>Create an Account</h2>
<form id="signupForm">
<label for="password">Password:</label><br>
<input
type="password"
id="password"
name="password"
required
pattern="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[\W_]).{8,}$"
title="At least 8 characters, 1 uppercase, 1 lowercase, 1 number, and 1 special character"
><br>
<div id="feedback" class="feedback"></div>
<br>
<button type="submit">Register</button>
</form>
<script>
const passwordInput = document.getElementById('password');
const feedback = document.getElementById('feedback');
passwordInput.addEventListener('input', function () {
const password = passwordInput.value;
const rules = [
{ regex: /.{8,}/, label: 'At least 8 characters' },
{ regex: /[a-z]/, label: 'At least one lowercase letter' },
{ regex: /[A-Z]/, label: 'At least one uppercase letter' },
{ regex: /\d/, label: 'At least one number' },
{ regex: /[\W_]/, label: 'At least one special character' },
];
let messages = rules.map(rule => {
return rule.regex.test(password)
? `<div class="valid">✔ ${rule.label}</div>`
: `<div class="invalid">✖ ${rule.label}</div>`;
});
feedback.innerHTML = messages.join('');
});
</script>
</body>
</html>
What This Code Does
-
Adds
inputevent listener on the password field. -
Runs five regex checks as the user types.
-
Displays ✅ or ❌ beside each rule live.
-
Keeps the native HTML5
patternvalidation as a final guard.
Tips
-
✅ Combine real-time feedback and HTML5 validation for best results.
-
✅ Customize error styles with CSS (
.valid,.invalid). -
✅ Consider hiding/showing the password field for better UX.
-
✅ Use this as part of a larger password strength meter if needed.
⚠️ Common Pitfalls
-
❌ Don’t disable HTML5
patternthinking JS alone is secure. -
❌ Avoid running validation only on
blur; useinputfor immediate feedback. -
❌ Avoid overly strict regex that frustrates users without adding real security.
Final Thoughts
This approach provides a user-friendly, secure, and robust password validation experience by blending HTML5, regex, and JavaScript. It helps guide users to create secure passwords before the form is even submitted.
Would you like me to add password confirmation matching or strength meter integration next?
