jquery - why sometime ajax success function doesn't work in asp.net mvc? -


in project, i've used datatable crud operation.but have problem didn't work success function, of course, saw network tab received { status":true} datatable didn't reload , redirected blank page.i've added alert function success function alert function didn't work.sometimes got error the required anti-forgery form field "__requestverificationtoken" not present. when want delete record table. , create , edit give me { status":true} message.

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// get: admin/users/delete/5 public actionresult delete(string id) {     if (id == null)     {         return new httpstatuscoderesult(httpstatuscode.badrequest);     }     user user = db.user.find(id);     userviewmodel userviewmodel=new userviewmodel();     userviewmodel.userid = user.id;     userviewmodel.username = user.username;     userviewmodel.firstname = user.firstname;     userviewmodel.lastname = user.lastname;     userviewmodel.email = user.email;     userviewmodel.isactive = user.isactive;     userviewmodel.gender = user.gender;     userviewmodel.phonenumber = user.phonenumber;     userviewmodel.address = user.address;     if (user == null)     {         return httpnotfound();     }     return partialview(userviewmodel); }  // post: admin/users/delete/5 [httppost, actionname("delete")] [validateantiforgerytoken] public actionresult deleteconfirmed(string id) {     bool status=false;     user user = db.user.find(id);     db.user.remove(user);     db.savechanges();      return json(new { status = true }, jsonrequestbehavior.allowget); } 

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@model  ienumerable<dentistry.areas.viewmodels.userviewmodel>   @{     viewbag.title = "مدیریت کاربران";  }  @*<h2>مدیریت کاربران</h2>*@  @section styles{      <link href="~/areas/admin/assets/global/plugins/datatables/datatables.min.css" rel="stylesheet" type="text/css" />     <link href="~/areas/admin/assets/global/plugins/datatables/plugins/bootstrap/datatables.bootstrap-rtl.css" rel="stylesheet" type="text/css" />     <link href="~/areas/admin/assets/global/plugins/bootstrap-modal/css/bootstrap-modal-bs3patch.css" rel="stylesheet" type="text/css" />     <link href="~/areas/admin/assets/global/plugins/bootstrap-modal/css/bootstrap-modal.css" rel="stylesheet" type="text/css" /> }  <style>     .table-checkable tr > td:first-child, .table-checkable tr > th:first-child {         text-align: center;         max-width: 50000px;         min-width: 40px;         padding-right: 0;         padding-left: 0;     }      #delete .modal-header {         border-bottom: 1px solid #efefef;         background: #e7505a !important;     }      .modal {         border-radius: 0px;         -webkit-border-radius: 0px;         -moz-border-radius: 0px;     } </style>   <div class="col-md-12 col-sm-12">     <!-- begin example table portlet-->     <div class="portlet box green">         <div class="portlet-title">             <div class="caption">                 <i class="fa fa-cogs"></i>کاربران             </div>             <div class="actions">                 <a href="/admin/users/create" data-target="#create" data-toggle="modal" class="btn btn-default btn-sm">                     <i class="fa fa-plus"></i> کاربر جدید                 </a>                 <a href="javascript:window.print()" class="btn btn-default btn-sm">                     <i class="fa fa-print"></i> چاپ                 </a>             </div>         </div>         <div class="portlet-body">             <table class="table table-striped table-bordered table-hover table-checkable order-column mydatatable">                 <thead>                     <tr>                         @*<th class="table-checkbox">                                 <label class="mt-checkbox mt-checkbox-single mt-checkbox-outline">                                     <input type="checkbox" class="group-checkable" data-set="mydatatable .checkboxes" />                                     <span></span>                                 </label>                             </th>*@                         <th>نام کاربری </th>                         <th>نام </th>                         <th>نام خانوادگی</th>                         <th>جنسیت</th>                         <th>ایمیل</th>                         <th>وضعیت</th>                         <th>شماره تماس</th>                         <th>آدرس</th>                         <th>ویرایش</th>                         <th>حذف</th>                     </tr>                 </thead>               </table>         </div>     </div> </div>    <div id="edit" class="modal fade" tabindex="-1" data-width="760">     <div class="modal-header">         <button type="button" class="close" data-dismiss="modal" aria-hidden="true"></button>         <h4 class="modal-title">ویرایش کاربران</h4>     </div>     <div class="modal-body">         <div class="row">          </div>     </div>  </div>  <div id="delete" class="modal fade" tabindex="-1" data-width="760">     <div class="modal-header">         <button type="button" class="close" data-dismiss="modal" aria-hidden="true"></button>         <h4 class="modal-title">آیا قصد حذف این کاربر را دارید؟</h4>     </div>     <div class="modal-body">         <div class="row">          </div>     </div>  </div>  <div id="create" class="modal fade" tabindex="-1" data-width="760">     <div class="modal-header">         <button type="button" class="close" data-dismiss="modal" aria-hidden="true"></button>         <h4 class="modal-title"><i class="fa fa-user-plus"></i>   کاربر جدید </h4>     </div>     <div class="modal-body">       </div>  </div>  <!-- begin portlet portlet--> <!-- end portlet portlet-->     @section scripts{       <!-- begin page level plugins -->     <script src="~/areas/admin/assets/global/scripts/datatable.js" type="text/javascript"></script>     <script src="~/areas/admin/assets/global/plugins/datatables/datatables.min.js" type="text/javascript"></script>     <script src="~/areas/admin/assets/global/plugins/datatables/plugins/bootstrap/datatables.bootstrap.js" type="text/javascript"></script>      <script src="~/areas/admin/assets/pages/scripts/table-datatables-managed.min.js" type="text/javascript"></script>     <!-- end page level scripts -->     <script src="~/areas/admin/assets/global/plugins/bootstrap-modal/js/bootstrap-modalmanager.js" type="text/javascript"></script>     <script src="~/areas/admin/assets/global/plugins/bootstrap-modal/js/bootstrap-modal.js" type="text/javascript"></script>      <!-- begin page level scripts -->     <script src="~/areas/admin/assets/pages/scripts/ui-extended-modals.min.js" type="text/javascript"></script>      <script>          $(document).ready(function () {              var otable = $('.mydatatable').datatable({                 "ajax": "/users/getusers",                 "language": {                     "search": "جستجو:",                     "lengthmenu": " تعداد _menu_ رکورد در هر صفحه"                 },                 "autowidth": true,                 "columns": [                      { "data": "username", },                     { "data": "firstname", },                     { "data": "lastname", },                     { "data": "gender", },                     { "data": "email", },                     { "data": "isactive", },                     { "data": "phonenumber", },                     { "data": "address", },                      {                         "data": "userid", "width": "50px", "render": function (data) {                             //                             return '<a class="btn btn-info fa fa-pencil" data-toggle="modal" data-dismiss="modal" data-target="#edit"  href="/admin/users/edit/' + data + '"></a>';                         }                     },                     {                         "data": "userid", "width": "50px", "render": function (data) {                             return '<a class="btn btn-danger fa fa-trash" data-toggle="modal" data-dismiss="modal" data-target="#delete" href="/admin/users/delete/' + data + '"></a>';                         }                     }                     //}, {                     //    "data": 'isactive',                     //    render: function (data, type, row) {                     //        return '<span class="label label-sm label-success"> ' + data + ' </span>'                     //    }                     //}                 ], "columndefs": [                     {                         "render": function (data, type, row) {                             return '<span class="label label-sm label-success"> ' + data ? 'آقا' : 'خانم' + ' </span>' ;                         },                         "targets": 3 // replace 0 column if                     }, {                         "render": function (data, type, row) {                             return data ? 'فعال' : 'غیرفعال';                         },                         "targets": 5                     }                 ]                 //"fncreatedrow": function (row, data, dataindex) {                 //    var div = document.createelement("span");                  //    $(row).children("td:nth-child(1)").append(div);                 //}              });              $('body').on('hidden.bs.modal', '.modal', function () {                  $(this).removedata('bs.modal');             });          });       </script> } 

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  @model dentistry.areas.viewmodels.userviewmodel  @*<h2>حذف</h2>      <h3>آیا شما قصد حذف این سطر را دارید؟</h3>*@ @*<div class="modal-header">         <button type="button" class="close" data-dismiss="modal" aria-hidden="true">             <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>         </button>         <h4 class="modal-title custom_align" id="heading">آیا شما قصد حذف این سطر را دارید؟</h4>     </div>*@  @using (html.beginform("delete", "users", formmethod.post, new { @class = "popupform" })) {     @html.antiforgerytoken()     if (model != null && model.userid != string.empty)     {         @html.hiddenfor(a => a.userid, new { id = "userid" })         <div class="col-md-6">             <div class="form-group">                 <label>نام کاربری : </label>                 @html.displayfor(model => model.username)             </div>             <div class="form-group">                 <label>نام : </label>                 @html.displayfor(model => model.firstname)             </div>             <div class="form-group">                 <label>نام خانوادگی : </label>                 @html.displayfor(model => model.lastname)             </div>             <div class="form-group">                 <label>شماره همراه : </label>                 @html.displayfor(model => model.phonenumber)             </div>         </div>         <div class="col-md-6">             <div class="form-group">                 <label>جنسیت</label>                 @html.displayfor(model => model.gender)             </div>             <div class="form-group">                 <label>وضعیت : </label>                 @html.displayfor(model => model.isactive)             </div>             <div class="form-group">                 <label>ایمیل : </label>                 @html.displayfor(model => model.email)             </div>             <div class="form-group">                 <label>آدرس : </label>                 @html.displayfor(model => model.address)             </div>         </div>         <div class="row">             <div class="col-md-6">                 <button type="submit" class="btn  btn-success btn-flat btn-md"><span class="fa fa-check"></span>  بله  </button>                 <button type="button" class="btn btn-danger btn-flat btn-md"><span class="fa fa-close"></span> خیر</button>             </div>         </div>     } }  <script>      $(function () {         //var form = $('#userid');         //console.log(form);         console.log($('#userid').val());         $(".popupform").on("submit", function (e) {             e.preventdefault();            // e.stoppropagation();             submitdeleteform();          });     });     function submitdeleteform() {         var formdata = $(".popupform").serialize();         var url = "/users/delete";            var form = $('.popupform');            var __requestverification =@html.antiforgerytoken();            var token = $(__requestverification, form).val();         //  var form = $('.popupform')[0].action;         //   console.log(form.val());         //var formdata = false;         //if (window.formdata) {         //    formdata = new formdata(form);         // alert(formdata);         //}         var userid = json.stringify({ id: $("#userid").val() });         $.ajax({             type: 'post',             datatype: 'json',             url: url,             data: {                  __requestverificationtoken: token,                 id: userid              },              cache: false,             //contenttype: "application/json; charset=utf-8",             //  enctype: 'multipart/form-data',             processdata: false,             success: function (data) {                 if (data.status == true) {                     //alert('hiho');                     $('#edit').modal('hide');                     //window.location.href = "/admin/users/index";                     alert('hi');                     $('.mydatatable').datatable().ajax.reload();                 }             },             error: function (data) {                 console.log(data);             }          });     }    </script> 

please remove line

[validateantiforgerytoken] 

because not sending anti forgery key. send anti forgery key in ajax parameters or remove this.

for sending add parameter in request '__requestverificationtoken' value generate using
var token = html.antiforgerytoken();


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