Dependent dropdown in Laravel5 PHP. For full article check here http://josephrex.me/implementing-dynamic-drop-down-or-dependent-list-in-laravel4

category.php

<?php
namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Category extends Model{
  public function subcategories(){
   return this->hasMany('App\Subcategory')
  }
}

categoryController.php

<?php
use App\Category;

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;

class CategoryController extends Controller{
  public function api(Request $request){
    $input = $request->input('option');
    $category = Category::find($input);
    return response()->json($category->subcategories);
  }
}

routes.php

<?php
Route::get('api/dropdown', [
  'uses' => 'CategoryController@api',
  'as' => 'category_api'
]);