laravel, eloquent where condition get result in yajra datatable - php

Question

I asked this question twice but didn't get any answer, I have two tables: Country and Region so to get all regions you must select country_id which I did with normal table but how can I do this using ajax
thank you in advance
Model of Region:
public function getRegionsByCountryID($countryID)
{
return $this
->leftJoin('countries', $this->table.'.country_id', '=', 'countries.id')
->select
(
$this->table.'.*',
'countries.name as country_name'
)
->where('country_id','=',$countryID)
->orderBy('id','asc')
->get();
}
Jquery
$.ajax({
url:"{{ route('get-regions') }}",
type: 'GET',
data: {
'country_id': country_id
},
success: function(data){
},
});
});
Controller
public function getData(Request $request)
{
$data = $this->SourceData->getRegionsByCountryID($request->input('country_id'));
return Datatables::of($data)
->addIndexColumn()
->addColumn('Actions', function($data) {
return '....';
})
->rawColumns(['Actions'])
->make(true);
}
Blade
<div class="card-body">
<div class="table-responsive">
<table class="table table-bordered datatable">
<thead>
<tr>
<th>Id</th>
<th>No</th>
<th>Name</th>
<th>Country</th>
<th>Avaliable</th>
<th width="150" class="text-center">Action</th>
</tr>
</thead>
</table>
</div>
</div>