Cómo mostrar la ventana emergente "Éxito" o "Error" después de hacer clic en el botón de actualización en el que es un modal

Estoy trabajando en este proyecto de registro de empleados y no estoy exactamente seguro de cómo implementar este en django.

¿Cómo puedo mostrar un cuadro emergente o un cuadro modal pequeño como "Éxito" o "Error" después de hacer clic en el botón de actualización? Sería un éxito si hubieran introducido todos los detalles necesarios sobre el modal. Y error si olvidaron ingresar algunos detalles.

Aquí está el views.py

def save_employee_update(request):
print(request.POST)

emp_id = request.POST['employee_id']
fname = request.POST['first_name']
midname = request.POST['middle_name']
lname = request.POST['last_name']
pr_address = request.POST['present_address']
pm_address = request.POST['permanent_address']
zcode = request.POST['zipcode']
bday = request.POST['birthday']
email = request.POST['email_address']
pagibig = request.POST['pagibig_id']
sss = request.POST['sss_id']
tin = request.POST['tin_id']
sg_pr_id = request.POST['solo_parental_id']
# rg_sched = request.POST['reg_schedule']
usid = request.POST['userid']
defpass = request.POST['default_pass']
ustype = request.POST['user_type']
# j_title = request.POST['JobTitle']

employee = Employee.objects.get(employee_id=emp_id)

employee.first_name = fname
employee.middle_name = midname
employee.last_name = lname
employee.present_address = pr_address
employee.permanent_address = pm_address
employee.zipcode = zcode
employee.birthday = bday
employee.email_address = email
employee.pagibig_id = pagibig
employee.sss_id = sss
employee.tin_id = tin
employee.solo_parental_id = sg_pr_id
# employee.reg_schedule = rg_sched
employee.userid = usid
employee.default_pass = defpass
employee.user_type = ustype
# employee.JobTitle = j_title

employee.save()

return render(request, 'index.html')

Aquí está el modal

<!-- Modal -->
<div class="modal fade" id="employee.employee_id_{{ employee.employee_id }}" tabindex="-1" role="dialog" style="display: none; overflow: auto;"  aria-hidden="true" data-backdrop="static">

    <div class="modal-dialog modal-lg modal-dialog-centered" role="document">
        <div class="card">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                        <span aria-hidden="true">&times</span>
                    </button>
                </div>
            <form class="form" id="save_employee_update" name="save_employee_update" method="post" action="/save_employee_update">
                {% csrf_token %}
                <div class="modal-body" style="overflow: auto">
                    <input type="text" class="form-control" name="employee_id" value="{{employee.employee_id}}" hidden>
                    <!----pic---->
                    <div class="text-center">
                        <a href="/">
                            <img src="{% static 'img/faces/marc.jpg' %}"  id="employee_profile_pic" class="avatar" style="border-radius: 50% " alt="..." height="200" width="200" align="top-left"><br><br>
                            <small><input type="file" name="ppFile"  ></small>
                        </a>
                    </div>
                    <br><br>
                    <label style="align: left " class="bmd-label-floating" id="personal_details"><b>Personal Details</b></label>
                    <br><br>
                    <!------pic_end---->
                    <div class="container-fluid">
                        <div class="row">
                            <div class="col-xl-12">
                                <div class="form-row">
                                    <div class="col-md-4 mb-3">
                                        <div class="form-group bmd-form-group is-focused">
                                            <label class="bmd-label-floating" >First Name</label>
                                            <input type="text" class="form-control"  required id="first_name" name="first_name" value="{{employee.first_name }}" >
                                        </div>
                                    </div>
                                    <div class="col-md-4 mb-3">
                                        <div class="form-group bmd-form-group is-focused">
                                            <label class="bmd-label-floating" >Middle Name</label>
                                            <input type="text" class="form-control"  required id="middle_name" name="middle_name" value="{{employee.middle_name }}" >
                                        </div>
                                    </div>
                                    <div class="col-md-4 mb-3">
                                        <div class="form-group bmd-form-group is-focused">
                                            <label class="bmd-label-floating" >Last Name</label>
                                            <input type="text" class="form-control"  name="last_name" value="{{employee.last_name }}" >
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                        <div class="modal-footer">
                            <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                            <button id="employee_update_btn" type="submit" class="btn btn-success btn-round ">Update</button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
   </div>