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Editorial Team
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Asked: 2026-05-17T21:26:58+00:00

if i call a ajax request using jquery to an asp.net mvc controller action

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if i call a ajax request using jquery to an asp.net mvc controller action and inside that action an exception gets thrown, what is the best way to capture that and show something to the user.

right now my loading image just goes on forever . . . .

here is an example of my controller code:

  public ActionResult BatchAdd(int[] sharepointKeys)
  {
           MyViewModel vm = GetViewModel();
            return PartialView("MyPartialView", vm);
  }
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1 Answer

  1. Editorial Team

    c#

    public JsonResult Action(...)
{
    bool error = false;
    string msg = "";
    var data = "your data";

    try
    {
       //you code
    }
    catch (Exception ex)
    {
        error = true;
        msg = "Error ...";
    }

    return Json(new { error = error, msg = ms, data = data });
}

    js:

    $.ajax({
   type: "POST",
   url: "Controller/Action",
   data: "...",
   beforeSend: function(xhr){
        $("#showError").empty();
   },
   error: function(xhr, ts, et){
        $("#showError").append("<div>Error</div>");
   },
   success: function(response){

     if (response.error) {
        $("#showError").append("<div>"+response.msg+"</div>");
     } 
     else {
        // code ok response
     }


   }
 });

    With return ActionResult:

    Index.asp:

    <%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    Home Page
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    <div id="showError"></div>
    <div id="dataHtml"></div>

    <button id="example">Example</button>
    <script type="text/javascript">

        $(function () {

            $("#example").bind('click', function (ex) {

                $.ajax({
                    type: "POST",
                    url: "Home/BatchAdd",
                    data: { sharepointKeys: [1, 2, 3] },
                    beforeSend: function (xhr) {
                        $("#showError").empty();
                    },
                    error: function (xhr, ts, et) {
                        $("#showError").append("<div>Error</div>");
                    },
                    success: function (response) {

                        if ($(response).find("#error-message").length > 0) {
                            $("#showError").append("<div>" + $(response).find("#error-message").html() + "</div>");
                        }
                        else {
                            $("#dataHtml").html("<div>" + $(response).find("#container-response-ok").html() + "</div>");
                        }


                    }
                });
            });

        });

    </script>

</asp:Content>

    Site.master:

    <%@ Master Language="C#" Inherits="System.Web.Mvc.ViewMasterPage" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title><asp:ContentPlaceHolder ID="TitleContent" runat="server" /></title>
    <link href="../../Content/Site.css" rel="stylesheet" type="text/css" />
    <script src="../../Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
</head>

<body>
    <div class="page">

        <div id="header">

            <div id="menucontainer">
                <ul id="menu">              
                    <li><%= Html.ActionLink("Home", "Index", "Home")%></li>
                    <li><%= Html.ActionLink("About", "About", "Home")%></li>
                </ul>
            </div>
        </div>

        <div id="main">
            <asp:ContentPlaceHolder ID="MainContent" runat="server" />
            <div id="footer"></div>
        </div>
    </div>
</body>
</html>

    MyPartialView.ascx:

    <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<MvcApplication1.Controllers.MyViewModel>" %>
<div>
    <% if (Model.Error)
    { %>
    <div id="error-message"><%= Model.Message %></div>
    <% } else { %>
    <div id="container-response-ok">
      <div> all ok </div>
    </div>
    <% } %>
</div>

    HomeController.cs:

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    [HandleError]
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            ViewData["Message"] = "Welcome to ASP.NET MVC!";

            return View();
        }

        public ActionResult BatchAdd(int[] sharepointKeys)
        {
            MyViewModel vm = GetViewModel();

            try
            {
                vm.Error = true;
                vm.Message = "Error testing";
            }
            catch (Exception ex)
            {
                vm.Error = true;
                vm.Message = "Errro";
            }

            return PartialView("MyPartialView", vm);
        }

        public ActionResult About()
        {
            return View();
        }

        private MyViewModel GetViewModel()
        {
            return (new MyViewModel());
        }
    }



    public class MyViewModel
    {
        public bool Error { get; set; }
        public string Message { get; set; }

        public MyViewModel()
        {
            this.Error = false;
            this.Message = "";
        }
    }

}
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