尝试在键入时验证 django 表单字段时出现问题

问：

我正在尝试根据另一个问题在输入时验证字段（如何在键入时验证 django 表单字段？

js 不计算验证视图

形式

{{ form.num }}
<p id="validate_number" class="help is-danger is-hidden ">nome já utilizado</p>

js

<script>
    $('#id_num').on('input', function () {
      var id_number = $(this).val();
      $.ajax({
        url: '{% url 'validate-num' %}',
        data: {
          'num': id_number
          },
        dataType: 'json',
        success: function (data) {
          if (data.is_taken) {
            $("#validate_number").show();
            document.getElementById('id_num').style.borderColor = "red";
            document.getElementById("submit_change").disabled = true;
            }
          else {
            $("#validate_number").hide();
            document.getElementById('id_num').style.borderColor = "#e7e7e7";
            document.getElementById("submit_change").disabled = false;
            }
        }
      });
    });
</script>

url.py

urlpatterns = [
    # ...
    path('validatenum/', validate_inventory_number, name='validate-num'),
    # ...
]

视图

def validate_inventory_number(request):
    number = request.GET.get('num', None)
    data = {
        'is_taken': InventoryNumber.objects.filter(num=number).exists()
    }
    return JsonResponse(data)