👀 Views: 0 💬 Answers: 1 📅 Created: 2025-06-16

react react-hook-form usefieldarray javascript

I'm trying to configure I've been banging my head against this for hours... I've looked through the documentation and I'm still confused about I tried several approaches but none seem to work. I'm working with React Hook Form v7 and trying to manage a dynamic form with nested fields using the `useFieldArray` hook. The question arises when I try to update a nested input field within an array. Specifically, I have an array of 'users', each with a 'name' and a nested 'addresses' array. When I update the 'name' of a user, it triggers a re-render, but the nested 'addresses' do not update as expected. My implementation looks like this: ```javascript const { control, handleSubmit } = useForm(); const { fields, append, remove } = useFieldArray({ name: 'users', control }); const onSubmit = data => console.log(data); return ( <form onSubmit={handleSubmit(onSubmit)}> {fields.map((user, index) => ( <div key={user.id}> <input {...register(`users.${index}.name`)} defaultValue={user.name} /> <button type="button" onClick={() => remove(index)}>Remove User</button> {user.addresses.map((address, addressIndex) => ( <input key={address.id} {...register(`users.${index}.addresses.${addressIndex}`)} defaultValue={address} /> ))} <button type="button" onClick={() => append({ name: '', addresses: [''] })}>Add Address</button> </div> ))} <input type="submit" /> </form> ); ``` Despite following the documentation, the nested 'addresses' do not retain their values after I update 'name'. I see the console logging the correct structure, but the UI does not reflect the changes. No errors are thrown, and I’m not sure if I’m missing a key reactivity aspect or if there's an scenario with how I'm registering the nested fields. Any insights on how to ensure that nested fields update properly when the parent field changes would be greatly appreciated! This is part of a larger API I'm building. I'm coming from a different tech stack and learning Javascript.