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app/Http/Controllers/DataController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+use DB;
+
+class DataController extends Controller
+{
+    public function getVoivodeships()
+    {
+        $voivodeships = DB::table('wojewodztwa')->pluck("name","id");
+        return view('unit',compact('voivodeships'));
+    }
+
+    public function getCounties($id) 
+    {
+        $counties = DB::table("powiaty")->where("wojewodztwo_id",$id)->pluck("name","id");
+        return json_encode($counties);
+    }
+
+    public function getCommunities($id) 
+    {
+        $communities= DB::table("gminy")->where("powiat_id",$id)->pluck("name","id");
+        return json_encode($communities);
+    }
+}