How to show form modal when validation return error

Hi , i have 3 form modals at same page [Register Teachers, login Students , Register Teachers] so for now i need if there's validation error i show this modal with errors i using @error directive to show the error fro each input and it works but i can't show the modal - at login i used this way

#blade
   @if ($errors->has('username_login'))
                window.onload = function () {
                $('#loginModal').modal('show');

            }
            @endif

#controller
  public function login(LoginRequest $request)
    {

        $credentials = $request->validated();
        if (AUTH::guard('student')->attempt($credentials,$request->remember))
        {
            return redirect()->back();
        }
        return redirect()->back()->withInput($request->only('username'))->withErrors([
            'username_login' => __('login_error'),
        ]);

    }

but at register validation the logic is different cause that validation not able to do anything after validate

#Register controller 
public function store(RegisterRequest $request) {

        $attributes = $request->validated();
        $attributes['created_by'] = __('platform');
        $attributes['avatar'] = (new Mediaable($request))
            ->moveToDir("images/teachers/waiting/${attributes['username']}/photo")
            ->getMediaFromRequestByName('avatar')
            ->getMediaNameAfterUpload();
        if($request->has('cv'))
        {
            $attributes['cv'] = (new Mediaable($request))
                ->moveToDir("images/teachers/waiting/${attributes['username']}/cv")
                ->getMediaFromRequestByName('cv')
                ->getMediaNameAfterUpload();
        }


        $teacher = Teacher::create($attributes);
        if (!$teacher) {
            return redirect()->back()->with('error', 'Error message goes here');
        }

        return redirect()->route('teacherLogin')->with('success', __('messages.has_joined'));
    }

so if i used $errors->any() that may caused all modals open cause no specific parameters tells me which form and cause i using custom rules request validation i can't using ->fails() or something like .