使用 jQuery ajax 调用 Web API 时，如果存在错误消息或成功消息，如何返回错误消息或成功消息？

Question

我从事 asp.net MVC 应用程序。我遇到问题，当调用操作

RequesterIndex

控制器辞职时，无法显示错误消息或成功消息。

使用ajax请求调用API工作成功只需在甜蜜警报上显示错误消息或成功消息。

public async Task RequesterIndex(ResignationRequester resignationRequester) {
  var filenumber = resignationRequester.EmpID;
  if (Session[SessionKeys.UserCode] != null) {
    if (ModelState.IsValid) {
      if (resignationRequester.DirectManager == 0) {
        resignationRequester.errorMsg = "Department Manager Must Be Bigger Than 0";
        goto InvalidModel;
      }
      if (Convert.ToString(resignationRequester.LineManager).Length < 6 && !string.IsNullOrEmpty(resignationRequester.LineManager.ToString())) {
        resignationRequester.errorMsg = "Length Line Manager Must Be equal 6 or More";
        goto InvalidModel;
      }
      if (Convert.ToString(resignationRequester.DirectManager).Length < 6 && !string.IsNullOrEmpty(resignationRequester.DirectManager.ToString())) {
        resignationRequester.errorMsg = "Length Direct Manager Must Be equal 6 or More";
        goto InvalidModel;
      }
      if (!string.IsNullOrEmpty(Convert.ToString(resignationRequester.LineManager)) && resignationRequester.LineManagerName == null) {
        resignationRequester.errorMsg = "Line Manager Name Blank";
        goto InvalidModel;
      }
      if (julianRequestDate > 0 && SubmitionDate > 0 && julianRequestDate < SubmitionDate) {
        resignationRequester.errorMsg = "Last Worked Date Must be Bigger than Submit Date";
        goto InvalidModel;
      }

      int checkEmployeeNoExist = jde.CheckEmployeeExistOrNot(resignationRequester.EmpID);
      if (checkEmployeeNoExist >= 1) {
        resignationRequester.errorMsg = "Employee Exist Before";
        goto InvalidModel;
      }
     try {
        Workforce.InsertToReignation(resignationRequester, (string) Session[SessionKeys.Username], (DateTime) Session[SessionKeys.LastWorkingDate], noticeperiod, (int) Session[SessionKeys.UserCode]);
      } catch (Exception ex) {
        resignationRequester.errorMsg = "Create Not Done Correctly";
      }

      if (string.IsNullOrEmpty(ViewBag.errorMsg)) {
        resignationRequester.successMsg = "Resignation Submission form Created successfully";
      }
    } else {
      var errors = ModelState.Select(x => x.Value.Errors)
        .Where(y => y.Count > 0)
        .ToList();
      resignationRequester.errorMsg = "Some Required Fields Not Added";
      goto InvalidModel;
    }
  } else {
    resignationRequester.errorMsg = "No Data For This File No";
  }
  InvalidModel:
    ViewBag.isPostBack = true;
}

预期结果

显示

resignationRequester.errorMsg

ON API AJAX 调用（如果存在）的消息

或

显示

resignationRequester.successMsg

ON API AJAX 调用（如果存在）的消息

含义显示行动结果

RequesterIndex

调用甜蜜警报

$('#btnsubmit').click(function() {
  $("#ResignationApp").submit(function(e) {
    e.preventDefault(); // Prevent the default form submission
    // Serialize the form data
    var formData = $(this).serialize();
    console.log("data is" + formData)
    $.ajax({
      type: "POST",
      url: '@Url.Action("RequesterIndex", "Resignation")',
      data: formData,
      success: function(response) {
        var errorMsg = '@Html.Raw(Json.Encode(ViewData["ErrorMessage"]))';
        Swal.fire({
          icon: 'error',
          title: 'Submition Request',
          text: errorMsg
        });
      },
      error: function(error) {
        // Handle any errors here
        console.error(error);
      }
    });
  });
});

Answer 1

error: function(xhr, status, message) {
                if (xhr.responseJSON.errors != []) {
                                        for (const key in xhr.responseJSON.errors) {
                                            const message = xhr.responseJSON.errors[key];
                                           toastr.error(message);
                                        }
                                    }
}

尝试使用这个。