👀 Views: 14 💬 Answers: 1 📅 Created: 2025-06-13

next.js react-hook-form conditional-rendering JavaScript

I've been banging my head against this for hours. I'm optimizing some code but I'm relatively new to this, so bear with me. I'm working on a project and hit a roadblock. I'm working with a Next.js 13 application and using the `react-hook-form` library for form handling. I've set up a simple form to collect user data, but I'm working with an scenario where the form submission fails under certain edge cases, specifically when certain fields are conditionally rendered based on user input. When I render the conditional fields, I noticed that the form validation sometimes fails without any clear indication. For example, when I conditionally display a text input based on a checkbox state, the form doesn’t recognize that the input is required if the checkbox is checked. Here’s a snippet of my form setup: ```javascript import { useForm } from 'react-hook-form'; import { useState } from 'react'; const MyForm = () => { const { register, handleSubmit, formState: { errors } } = useForm(); const [isChecked, setIsChecked] = useState(false); const onSubmit = data => { console.log(data); }; return ( <form onSubmit={handleSubmit(onSubmit)}> <label> <input type="checkbox" onChange={() => setIsChecked(!isChecked)} /> Show additional field </label> {isChecked && ( <input {...register('additionalField', { required: true })} placeholder="This is required" /> )} {errors.additionalField && <span>This field is required</span>} <button type="submit">Submit</button> </form> ); }; ``` When I check the checkbox and don't fill out the additional input field, I expect to see the behavior message, but sometimes it doesn't show up, and the form submits without validation. I've checked if the state updates correctly and it seems fine; however, I am unsure if I need to manually trigger validation or if there's a specific way to handle the conditional rendering that I’m missing. I've also tried using `trigger` from `react-hook-form` after setting the checkbox state, but it doesn't seem to solve the scenario. Has anyone faced similar problems with `react-hook-form` when dealing with conditionally rendered fields? Any insights or best practices would be really appreciated! Any ideas what could be causing this? Is there a simpler solution I'm overlooking? I'd be grateful for any help.