Medium
How to Implement Async Form Validation Logic in a Custom React Hook
You're building a hook to manage form validation with async rules. What's the correct way to implement the missing validation logic?
1function useAsyncValidation(initialValue = '') {2 const [value, setValue] = useState(initialValue);3 const [error, setError] = useState(null);4 const [isValidating, setIsValidating] = useState(false);56 // Missing implementation for validate function7 ____________________8 ____________________9 ____________________10 ____________________1112 return {13 value,14 error,15 isValidating,16 setValue,17 validate18 };19}2021// Usage Example:22function PasswordField() {23 const validation = useAsyncValidation('');2425 const handleSubmit = async () => {26 const isValid = await validation.validate([27 value => value.length >= 8 || 'Too short',28 value => /[A-Z]/.test(value) || 'Need uppercase',29 async value => {30 const response = await checkPasswordHistory(value);31 return response.isUnique || 'Previously used';32 }33 ]);34 };35}