Ensure users submit correct and complete data with HTML form validation.
Why Form Validation Matters
- Prevents incomplete or incorrect submissions
- Improves user experience
- Reduces errors before sending data to the server
The required Attribute
Ensures the user fills out a field before submitting
Form cannot submit if the field is empty
The minlength and maxlength Attributes
Restrict the number of characters users can enter
- minlength Minimum number of characters
- maxlength Maximum number of characters
The pattern Attribute
Validates input against a regular expression
Enter 10 digit phone number
- [0-9]{10} Exactly 10 digits
- Useful for emails, phone numbers, postal codes, etc.
Combining Validation Attributes
- required Mandatory field
- minlength Password minimum length
- pattern Email format validation