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Source Code: (back to article)

<form id="signupForm" novalidate>
    <label for="phone">Phone (XXX-XXX-XXXX):</label>
    <input type="tel" id="phone" pattern="[0-9]{3}-[0-9]{3}-[0-9]{4}" required>
    <button type="submit">Sign Up</button>
    <span id="phoneError" style="color:red;"></span>
    <span id="successMessage" style="color:green; display:none;">Submission successful!</span>
</form>

if (!phone.checkValidity()) {
        event.preventDefault();
        phoneError.textContent = 'Please enter a phone number in the format XXX-XXX-XXXX.';
        successMessage.style.display = 'none'; // Hide success message if present
    } else {
        phoneError.textContent = '';
        phone.value = ''; // Reset the input field
        successMessage.textContent = 'Submission successful!';
        successMessage.style.display = 'block'; // Show success message
        event.preventDefault(); // Prevent form submission for demonstration
    }
});
</script>