Child select field for Laravel Nova

This field allows you to dynamically fill options of the select based on value in parent select field.

Field is based on nova-ajax-select. But instead of providing api endpoint, you can fill options by a closure function.

Install

composer require alvinhu/nova-child-select

Usage

Class have 3 special methods on top of default Select from Laravel Nova.

Single parent

parent should be a select field or another child select this one depends on. options should be a callable. it will receive parent select field's value as first argument and should return an array to be shown on the child select field.

Multiple parent

parents should be an array of select fields or other child selects this one depends on. options should be a callable. it will receive all parent field's values as an object as the first argument and should return an array to be shown on the child select field.

Example

use Alvinhu\ChildSelect\ChildSelect;

public function fields(Request $request)
    {
        return [

            ID::make()->sortable(),

            Select::make('Country')
                ->options(Country::all()->mapWithKeys(function ($country) {
                    return [$country->id => $country->name];
                }))
                ->rules('required'),

            Select::make('Province')
                ->options(Province::all()->mapWithKeys(function ($province) {
                    return [$province->id => $province->name];
                }))
                ->rules('required'),

            // Single parent
            ChildSelect::make('City')
                ->parent('country')
                ->options(function ($value) { 
                    City::whereCountry($value)->get()->mapWithKeys(function ($city) {
                        return [$city->id => $city->name];
                    });
                })
                ->rules('required'),

            // Multiple parents
            ChildSelect::make('City')
                ->parents(['country','province'])
                ->options(function ($parents) { 
                    City::whereCountry($parents->country)->whereProvince($parents->province)->get()->mapWithKeys(function ($city) {
                        return [$city->id => $city->name];
                    });
                })
                ->rules('required'),
        ];
    }