How can reset data when toggle the radio field?

[phuclh]

First of all, I want to say thank you because of the plugin.

#1 problem: Currently, when I toggle the radio, I can hide some fields. However, how can I set the value of these hidden fields to NULL? Because if I enter the value for these fields, after that I hide them and submit the form. These values are still inserted into the database.

#2 problem: How can I custom the validation for each case (hide/show). For example, when the fields display, I want to add required rule for them and remove that rule when these fields are hidden.

Thank you in advance!!!

[OwenMelbz]

Hi :)

1 Due to the way Nova works (very restrictive) there is no real way to apply any fancy callbacks when you change the visibility - the plugin works just by hiding/showing fields - There is no way to get access of other data and manipulate it easily.

2 Again just the way Nova works, the component on the frontend has no control over your backend validation.

---

You will need to utilise actual backend Laravel functionality to achieve this, there's 2 things you'd need to do to solve it.

1# Create a Model Observer

When you are saving your model, you will need to check the boolean toggle field to see what it is set to - and if it is set to the value which requires a null value you will need to set it there.

e.g.

<?php

namespace App\Observers;

use App\User;

class UserObserver {

    public function saving(User $user){
        if ($user->hide_photo) {  
            $user->photo_url = null
        }
    }

}

Obviously the code needs to be adapted for your use case, but that is the general process.

---

2. Normally in Laravel you can use Form Requests to make advance validation rules. However the Nova team have confirmed this is not possible -> https://github.com/laravel/nova-issues/issues/106#issuecomment-433490167

You "might" be able to (depending on your data) use these supported validation rules in your nova resource, e.g. the required_if required_unless etc etc - but if you cannot do it using them, then Nova is not yet feature ready for that