Question

你好我试图删除一行但是当有关系时它不会删除它但仍然返回true

 public ActionResult Delete(int? User)
    {
        if (!User.HasValue)
            return Json(new { IsComplete = false });

        try
        {

            var item = Db.Institutions.FirstOrDefault(p => p.Id == User.Value);
            Db.Institutions.Remove(item);
            Db.SaveChanges();


        }
        catch
        {
            return Json(new { IsComplete = false });
        }

        return Json(new { IsComplete = true });
    }

这是删除，如你所见，这是脚本;

  $(document).on("click", ".m-portlet__nav-link", function () {
        var myDataText = $(this).data('title');
        var myDataId = $(this).data('id');
        var myDataUrl = $(this).data('url') + "/" + myDataId;
        $(".modal-body .dataIdFromJs").text(myDataText);

        $("#saveChanges").click(function () {

            var User = myDataId;

            $.ajax({
                dataType: "json",
                type: "POST",
                contentType: "application/json",
                url: '@Url.Action("Delete", "Institution")',
                data: JSON.stringify({ 'User': User }),
                success: function (data) {

                    toastr.options = {
                        "closeButton": true,
                        "debug": false,
                        "newestOnTop": false,
                        "progressBar": false,
                        "positionClass": "toast-top-right",
                        "preventDuplicates": true,
                        "onclick": null,
                        "showDuration": "300",
                        "hideDuration": "1000",
                        "timeOut": "5000",
                        "extendedTimeOut": "1000",
                        "showEasing": "swing",
                        "hideEasing": "linear",
                        "showMethod": "fadeIn",
                        "hideMethod": "fadeOut"
                    };

                    toastr.success("İşleminiz başarıyla tamamdlandı.");


                },
                error: function (data) {

                    toastr.options = {
                        "closeButton": true,
                        "debug": false,
                        "newestOnTop": false,
                        "progressBar": false,
                        "positionClass": "toast-top-right",
                        "preventDuplicates": true,
                        "onclick": null,
                        "showDuration": "300",
                        "hideDuration": "1000",
                        "timeOut": "5000",
                        "extendedTimeOut": "1000",
                        "showEasing": "swing",
                        "hideEasing": "linear",
                        "showMethod": "fadeIn",
                        "hideMethod": "fadeOut"
                    };

                    toastr.error("Hata, tekrar deneyiniz!");


                }
            });

        });
    });

当没有关系时它正在工作并且返回true也删除了行但是当存在关系时它不会删除该行但仍然返回true如果由于关系而未删除行时如何返回false

Answer 1

在服务器上发生意外（即404错误）之前，AJAX调用中的error: function (data)永远不会被调用。

根据您编写的代码行总是落在success: function (data)中，因为您正在处理异常并返回一些响应。

正如@Stephen Muecke在评论中所建议的那样，你不应该使用catch来调用AJAX的error函数或者只是检查

success: function (data) 
{ 
  if(data.IsComplete) 
   { 
    // success toast
   } 
  else 
   {
    //error toast
   };
}

如果未删除行，则无法返回false

1 个答案: