Select2 example with Livewire

livewire-select2-blade.php

<!-- Make sure jquery.js, Select2.js and Select2.css files are included (in master.blade.php or another template file) -->

<div>
    <div wire:ignore>
        <select class="select_country" wire:model="country">
            <option value="" disabled>Please select the country</option>

            @isset($this->countries)
                @foreach(json_decode(json_encode($this->countries)) as $country)
                    <option value="{{ $country->code }}">{{ $country->name }}</option>
                @endforeach
            @endisset
        </select>
    </div>

    <div>
        <select class="select_state" wire:model="state">
            <option value="" disabled>Please select the country first</option>

            @isset($this->states)
                @foreach(json_decode(json_encode($this->states)) as $state)
                    <option value="{{ $state->code }}">{{ $state->name }}</option>
                @endforeach
            @endisset
        </select>
    </div>

    <script>
        $(document).ready(function() {
            $('select').select2();
        });

        $(window).on('refreshSelectBox', function(e) {
            $('select').select2();
        });

        $('.select_country').on('change', function (e) {
            @this.set('country', e.target.value);
        });
        
        $('.select_state').on('change', function (e) {
            @this.set('state', e.target.value);
        });
    </script>
</div>

livewire-select2-class.php

<?php

namespace App\Http\Livewire;

use Livewire\Component;

class CountryAndState extends Component
{
    public $countries = [], $states = [], $states_db = [];
    public $country = '', $state = '';

    public function boot()
    {
        // You don't need it in real use case. The states represent the object or database query you are looking for.
        $this->states_db = [
            ['country' => 'US', 'code' => 'AL', 'name' => 'Alabama'],
            ['country' => 'US', 'code' => 'AK', 'name' => 'Alaska'],
            ['country' => 'US', 'code' => 'AZ', 'name' => 'Arizona'],
            ['country' => 'US', 'code' => 'AR', 'name' => 'Arkansas'],
            ['country' => 'CA', 'code' => 'AB', 'name' => 'Alberta'],
            ['country' => 'CA', 'code' => 'MB', 'name' => 'Manitoba'],
            ['country' => 'CA', 'code' => 'NU', 'name' => 'Nunavut'],
            ['country' => 'CA', 'code' => 'ON', 'name' => 'Ontario'],
        ];
    }

    public function mount()
    {
        $this->countries = [
            ['code' => 'US', 'name' => 'United States'],
            ['code' => 'CA', 'name' => 'Canada'],
            ['code' => 'AU', 'name' => 'Australia'],
            ['code' => 'NZ', 'name' => 'New Zealand'],
        ];
    }

    public function updatedCountry()
    {
        $this->state = '';
        $this->states = collect($this->states_db)->where('country', $this->country)->all();

        $this->dispatchBrowserEvent('refreshSelectBox');
    }

    public function updatedState()
    {
        $this->dispatchBrowserEvent('refreshSelectBox');
    }

    public function render()
    {
        return view('livewire.country-and-state');
    }
}