React 18: Handling Form Validation with Custom Hooks and State Management Conflicts
I'm currently implementing a form in my React 18 application using a custom hook for validation. However, I'm working with issues where the validation state and the input state seem to conflict, causing the form to behave unexpectedly. Specifically, when I type into the input fields, the validation state sometimes resets or fails to update as expected. Here’s a simplified version of my code: ```javascript import React, { useState } from 'react'; const useForm = (initialValues, validate) => { const [values, setValues] = useState(initialValues); const [errors, setErrors] = useState({}); const handleChange = (e) => { const { name, value } = e.target; setValues({ ...values, [name]: value }); setErrors(validate({ ...values, [name]: value })); }; return { values, errors, handleChange }; }; const MyForm = () => { const initialValues = { username: '', email: '' }; const validate = (values) => { const errors = {}; if (!values.username) { errors.username = 'Username is required'; } if (!values.email.includes('@')) { errors.email = 'Email is invalid'; } return errors; }; const { values, errors, handleChange } = useForm(initialValues, validate); return ( <form> <div> <input type="text" name="username" value={values.username} onChange={handleChange} /> {errors.username && <span>{errors.username}</span>} </div> <div> <input type="email" name="email" value={values.email} onChange={handleChange} /> {errors.email && <span>{errors.email}</span>} </div> <button type="submit">Submit</button> </form> ); }; ``` After typing in the username field, the behavior message for the email field sometimes flickers or disappears, even though I haven't interacted with the email input yet. I’ve tried various approaches to ensure that the validation runs only after the input has changed, but I still encounter the same scenario. I've also checked the React DevTools and noticed that the component re-renders more than expected when I type in the inputs, even if the validation state hasn't changed. I suspect that the state updates might be causing re-renders that affect the validation, but I'm not sure how to resolve this without complicating my hook logic further. Any insights on how to fix this scenario or best practices for managing validation in forms with custom hooks would be greatly appreciated!