without select category not show subcategory

Question

This is create.blade.php file. In this include css and js file too.. Html code and ajax code view file

Answer 1

you have done silly mistake , you are sending ajax request on change of category select dropdown to your create function , while your create function is rendering view post.create instead of return json response to ajax request .

so now what you can do ? 2 options available to you :

option 1 : create other function named "get_subcategory_by_category_id" and that will return subcategories in json , also create new route in routes/web.php for same .

option 2 : laravel provide $request->ajax() to detect that request is ajax or not ? so use that and return response in json , so you will get response .

public function create(Request $request){
    $categories = Category::all();
    $subcategories = DB::table('subcategories')
                        ->where('category_id', $request->category_id)
                        ->pluck('subcategory', 'id');

    if($request->ajax()){
        $response=array('categories'=>$categories,'subcategories'=>$subcategories);
        return response()->json($response,200);
    }
    return view('post.create', compact('categories', 'subcategories'));
}

your ajax function should be like below :

make sure that your request url is proper , also check Inspect Element > Network tab for ajax request response .