How to use select2 multiselect with livewire - laravel

Question

What I am trying to achieve is, there are two models A and B with a relationship of One to many, where A has many B. So if the records for A and B have already been created, A can be assigned to many B. So I started this current project with livewire, and now I am at a loss. Normal select with multiple works just fine and populates the array in the backend of livewire. But when I use select2 nothing is stored in the array, and when I dd it, it shows an empty array.
Even though livewire provides wonderful set of tools, I am starting to realize that there is a lot of gray areas where things are missing or lacks external support, like select2 here.
Here is what I have done so far:
<div>
<div class="tab-pane fade show active" id="card1" role="tabpanel" aria-labelledby="card1-tab">
<div class="pt-3"></div>
<div class="row" >
<div class="form-group col">
<label for="cards">Enter Cards</label>
<select class="form-control select2" id="cards" multiple="multiple" onchange="this.dispatchEvent(new InputEvent('input'))>
<option disabled="">Select Cards</option>
#foreach($cardsUnassigned as $card)
<option value="{{ $card->id }}">{{ $card->imei_number }}</option>
#endforeach
</select>
</div>
<div class="form-group col">
<label for="technicians" class="">Technicians</label>
<select class="form-control select2" id="technicians" wire:model='techies.'>
<option disabled="">Select Technicians</option>
#foreach($technicians as $tech)
<option value="{{ $tech->id }}">{{ $tech->first_name }}</option>
#endforeach
</select>
</div>
</div>
#foreach($cardSelect as $key => $value)
{{$value}}
#endforeach
<button wire:click="assignCardToTech()" class="btn btn-primary">Submit</button>
</div>
</div>
#push('scripts')
<script>
$('#cards').select2({
placeholder: 'Select Cards to assign'
});
//send data to livewire
$('#technicians').select2({
placeholder: 'Select Technicians'
});
</script>
#endpush
And the backend:
<?php
namespace App\Http\Livewire\Stock\Assigns;
use App\Models\Card;
use App\Models\Sim;
use App\Models\Technician;
use Livewire\Component;
use Livewire\WithPagination;
use Illuminate\Support\Facades\Auth;
class Assigns extends Component
{
public $sortBy_card = 'imei_number';
public $sortBy_sim = 'ip';
public $sortDirection = 'asc';
public $search = '';
public $perPage = 10;
public $cardSelect = [];
public $techies;
public function render()
{
$simsUnassigned = Sim::query()
->whereNull('technician_id')
->searchUnassigned($this->search)
->get();
$cardsUnassigned = Card::query()
->whereNull('technician_id')
->searchUnassignedCard($this->search)
->get();
// dd($cardsUnassigned);
$simsAssigned = Sim::query()
->searchAssigned($this->search)
->orderBy($this->sortBy_sim, $this->sortDirection)
->paginate($this->perPage);
$cardsAssigned = Card::query()
->searchAssignedCard($this->search)
->orderBy($this->sortBy_card, $this->sortDirection)
->paginate($this->perPage);
$technicians = Technician::query()->get();
return view('livewire.stock.assigns.assigns',compact('simsUnassigned','cardsUnassigned','simsAssigned','cardsAssigned','technicians'))
->extends('layouts.base')
->section('content');
}
public function assignCardToTech(){
dd($this->cardSelect);
if($this->cards){
foreach($this->cards as $card){
}
}
}
}
Hopefully this helps.

Answer 1

######## INSIDE LIVEWIRE COMPONENT
public array $locationUsers = [];
protected $listeners = ['locationUsersSelected'];
public function locationUsersSelected($locationUsersValues)
{
$this->locationUsers = $locationUsersValues;
}
######## INSIDE LIVEWIRE BLADE
<div class="col-md-12 mb-3" wire:ignore>
<label for="locationUsers">Select Users</label>
<select id="locationUsers" class="form-control select2" multiple="multiple">
<option value="">--select--</option>
#foreach($this->users as $id => $name)
<option value="{{ $id }}">{{ $name }}</option>
#endforeach
</select>
</div>
######## INSIDE LIVEWIRE SCRIPTS
document.addEventListener('livewire:load', function () {
$('#locationUsers').on('select2:close', (e) => {
#this.emit('locationUsersSelected', $('#locationUsers').select2('val'));
});
$('#locationUsers').val(#this.get('locationUsers')).trigger('change');
});

Answer 2

Your could try adding this to your html
<div class="form-group col-md-6" wire:ignore>
<label for="manager" class="mb-0 h5">Assign Managers:</label>
<select wire:model="reporting_managers" id="manager" class="select-2 multiple='multiple' data-placeholder="Assign Managers">
#foreach ($managers as $manager)
<option value="{{ $manager->id }}" data-name="{{ $manager->name }}">{{ $manager->name }}</option>
#endforeach
</select>
</div>
and then in your javaScript section
$('#manager').on('select2:select', function (e) {
#this.set('reporting_managers', $('#manager').select2('val'));
});
$('#manager').on('select2:unselect', function (e) {
#this.set('reporting_managers', $('#manager').select2('val'));
});
This will directly store your selection in variable in livewire and won't get deselected on render.