why $.ajax not work in my project asp.net mvc 4

public ActionResult Index(int page=1)
       {
           var model = (from item in _db.News
                        join c in _db.SPNews on item.Id equals c.NewsId
                        orderby item.CreateDate
                        where c.GroupNewsId == 1
                        select item).ToPagedList(page, 6);
           if(Request.IsAjaxRequest())
           {
               return PartialView("_AllNewsView", model);
           }
           return View(model);
       }

@model IPagedList<News>
@{
    ViewBag.Title = "خبرها";
}

<h2>آرشیو کامل خبرها</h2>
@Html.Partial("_AllNewsView", Model)

@model IPagedList<News>
<div id="ViewAllNews">
    <div id="portfolio">
        <ul>
            @{int count = 0;}
            @foreach (var item in Model)
            {
                if (count % 2 == 0)
                {
                    <li>

                        <img src="@Url.Content(item.ImageUrl)" alt="" />
                        <h2> @item.Title </h2>
                        <p>@item.Summary</p>
                        <p class="readmore"><a href="#">Read More Here »</a></p>
                    </li>
                }
                else
                {
                    <li class="last">
                        <img src="@Url.Content(item.ImageUrl)" alt="" />
                        <h2>@item.Title</h2>
                        <p>@item.Summary</p>
                        <p class="readmore"><a href="#">Read More Here »</a></p>
                    </li>
                }
                count++;
            }

        </ul>
    </div>
    <div class="Pagelist" data-otf-target="#ViewAllNews">
        @Html.PagedListPager(Model, page => Url.Action("index", new { page }),
        PagedList.Mvc.PagedListRenderOptions.ClassicPlusFirstAndLast)
    </div>

</div>

$(function () {

    var getpage = function () {

        var $a = $(this);

        var options = {
            url: $a.attr("href"),
            type: "GET"
        };
        $.ajax(options).done(function (data) {
            var target = $a.parents("div").parents("div").attr("data-otf-target");
            $(target).replaceWith(data);
           
        });
        return false;
    };
    $(".pagination a").click(getpage);
});

bundles.Add(new ScriptBundle("~/bundles/jquery").Include(
                      "~/Scripts/jquery-{version}.js",
                      "~/Scripts/jquery-slider.js",
                      "~/Scripts/jquery-custom.js",
                      "~/Scripts/jquery-tabs.js",
                      "~/Scripts/jquery-prettyPhoto.js",
                      "~/Scripts/jquery.unobtrusive*",
                      "~/Scripts/otf.js"
                     ));