A simple and beginner-friendly form validation example using HTML, Tailwind CSS, and JavaScript.
- ✅ Real-time validation as you type
- ✅ Visual feedback with red/green borders
- ✅ Error messages below each field
- ✅ Responsive design
- ✅ Clean and modern UI
- Open the file: Simply open
index.htmlin your web browser - Test the form: Try filling out the form fields to see validation in action
- Validation rules:
- Name: Must be at least 2 characters
- Email: Must be a valid email format
- Phone: Must be a valid phone number
- Password: Must be at least 8 characters
- Confirm Password: Must match the password
- Each input field has a label and an error message div
- Form uses Tailwind CSS classes for styling
- Inputs have focus states and transitions
- Uses Tailwind's utility classes for styling
- Custom CSS for error/success states
- Responsive design with
max-w-md
- Validation functions: Check if input is valid
- Event listeners: Trigger validation when user leaves a field (blur event)
- Visual feedback: Add/remove CSS classes for error/success states
- Form submission: Prevent submission if any field is invalid
- Event Listeners: JavaScript listens for when users interact with the form
- DOM Manipulation: We change the appearance of elements based on validation
- Regular Expressions: Used to validate email and phone formats
- CSS Classes: We add/remove classes to show different states
You can easily customize this form by:
- Changing colors in the Tailwind classes
- Adding more validation rules
- Modifying the error messages
- Adding more form fields
Works in all modern browsers that support:
- ES6 JavaScript
- CSS Grid/Flexbox
- Tailwind CSS
Once you understand this example, you can:
- Add more complex validation rules
- Connect it to a backend server
- Add loading states
- Implement password strength indicators
- Add more form fields