I am trying to access TempData in Javascript. but getting null value.
I am making ajax call to Update the record and i want to display Record updated succesfully message. which will come from UpdateOperation action from the controller.
but currently it will display null value. I also check with Firebug it shows as follows:

function onComplete(e) {



if (e.name == update) {



alert('');



} 

Here is my code of controller

 public class OperationController : BaseController

    {

        /// <summary>

        /// Index action will return template view of the page without data

        /// </summary>

        /// <returns>Blank Action</returns>

        public ActionResult Index()

        {

            return this.View();

        }



        /// <summary>

        /// Get all Operation from System

        /// </summary>

        /// <returns>return action result</returns>

        [GridAction]

        public ActionResult SelectOperation()

        {

            IEnumerable<OperationEntity> operationList = OperationComponent.GetAll();

            return this.View(new GridModel(operationList));

        }



        /// <summary>

        /// Method for update operation

        /// </summary>

        /// <param name=entity>moduleViewModel to update Module</param>

        /// <returns>return action result</returns>

        [GridAction]

        public ActionResult UpdateOperation(OperationEntity entity)

        {

            if (ModelState.IsValid)

            {

                entity.Log = new BusinessCore.BusinessEntities.LogDetails();

                entity.Log.ModifiedBy = SessionHelper.UserId;

                Status status = OperationComponent.Update(entity);

                this.TempData[AlertMessage] = status.Message;

                this.ViewData[_AlertMessage] = status.Message;

                return this.View(new GridModel(OperationComponent.GetAll()));

            }

            else

            {

                return this.View(entity);

            }

        }

    }

In my view

@using Telerik.Web.Mvc.UI;

@{

    ViewBag.Title = Operation List;

}



<h2>@ViewBag.Title</h2>

<script src=../../../../Scripts/jquery-1.7.1.min.js type=text/javascript></script>

<script type=text/javascript>

//    function onSave(e) {

//        alert('Record Save Succesfully');

//    }

    function onComplete(e) {

        if (e.name == update) {

           alert('@TempData[AlertMessage]');

            alert('@ViewData[_AlertMessage]');

        }

        if (e.name == insert) {

            alert(Operation Inserted Successfully);

        }

        if (e.name == delete) {

            alert(Operation Deleted Successfully);

        }

    }

    function newAlert(type, message) {

    if (message !=  || message != null) {

        $(#alert-area).append($(<div class='alert alert-success  + type +  fade in' data-alert><p><b>  + message +  </b></p></div>));

        $(.alert-success).delay(4000).fadeOut(slow, function () { $(this).remove(); });

    }

}

</script>



@(Html.Telerik().Grid<QuexstERP.BusinessCore.BusinessEntities.SysAdmin.OperationEntity>()

        .Name(Grid)

         .DataKeys(keys => 

        {

            keys.Add(p => p.Id);

        })

                    .ToolBar(commands => commands.Insert().ButtonType(GridButtonType.Image).ImageHtmlAttributes(new { style = margin-left:0, title = Add }))

        .DataBinding(dataBinding =>

        {

            dataBinding.Ajax()

                .Select(SelectOperation, Operation)

                .Insert(InsertOperation, Operation)

                .Update(UpdateOperation, Operation)

                .Delete(DeleteOperation, Operation);

        })

        .Columns(columns =>

        {

            columns.Command(commands =>

            {

                commands.Edit().ButtonType(GridButtonType.Image).HtmlAttributes(new { title = Edit });

                commands.Delete().ButtonType(GridButtonType.Image).HtmlAttributes(new { title = Delete });

            }).Width(80).Title(Commands);

            columns.Bound(p => p.Name).Width(200).Title(Operation Name);

            columns.Bound(p => p.Description).Width(310).Title(Description);

        })

        .ClientEvents(events => events

                .OnComplete(onComplete)

                )

                    .Editable(editing => editing.Mode(GridEditMode.PopUp).InsertRowPosition(GridInsertRowPosition.Top))



        .Pageable()

        .Scrollable()

        .Sortable()

        .Filterable()        

)

@section HeadContent {

<style type=text/css>

    .field-validation-error

    {

        position: absolute;

        display: block;

    }



    * html .field-validation-error { position: relative; }

    *+html .field-validation-error { position: relative; }



    .field-validation-error span

    {

        position: relative;

        white-space: nowrap;

        color: red;

        padding: 10px 5px 3px;

        background: transparent url('@Url.Content(~/Content/Common/validation-error-message.png) ') no-repeat 0 0;

    }



    /* in-form editing */

    .t-edit-form-container

    {

        width: 480px;

        margin: 1em;

    }



    .t-edit-form-container .editor-label,

    .t-edit-form-container .editor-field

    {

        padding-bottom: 1em;

        float: left;

    }



    .t-edit-form-container .editor-label

    {

        width: 25%;

        text-align: right;

        padding-right: 3%;

        clear: left;

    }

    .t-edit-form-container .editor-field textarea

    {

    font-size:11px;

    width:80%;

}

    .t-edit-form-container .editor-field

    {

        width: 70%;

    }

</style>

}