Claude Code
ui
Form Validation Logic Partially Implemented
A form was scaffolded with basic structure but validation is incomplete. Some fields check for empty values but don't validate format (emails, phone numbers). Others bypass validation entirely due to missing checks. Invalid data is submitted to backend.
Frontend validation is partially implemented but inconsistent across form fields.
Error Messages You Might See
Invalid email accepted by form
Form submitted with empty required fields
Backend rejects data frontend accepted
Common Causes
- Validation logic written for some fields but not all form fields
- Validation doesn't prevent form submission (submit button not disabled)
- Format validators missing (email regex, phone format, date range)
- Error messages not shown to user, validation happens silently
- Backend validation doesn't match frontend, causing confusing UX mismatch
How to Fix It
Complete validation for all fields. Add format validation beyond 'not empty' (email regex, length limits). Disable submit button until form valid. Display error messages next to invalid fields. Always validate on backend too, never trust frontend validation. Use a form library (Formik, React Hook Form) for consistency.
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Get HelpFrequently Asked Questions
Should validation happen on change or submit?
On change for improved UX (show errors immediately). But also validate on submit. Backend must validate too.
What should be validated on backend?
All validation from frontend, plus business logic validation that requires database queries (username uniqueness, account status).
How to show validation errors?
Display error message below field using aria-describedby for accessibility. Highlight invalid fields (border-color: red).