Ajax.BeginForm(...) not always working, full postback sometimes, using ASP.NET MVC_问答_开发者

I cannot for the life of me figure out why this postback sometimes does an ajax one as it is supposed to and sometimes it does not. Here is the relevant code:

JS:

<html>
<head>
<title>Index</title>
<link href="/Content/screen.css" rel="stylesheet" type="text/css" />
<!--[if lt IE 8]><link href="/Content/ie.css" rel="stylesheet" type="text/css" /><![endif]-->
<link href="/Content/plugins/fancy-type/screen.css" rel="stylesheet" type="text/css" />
<link href="/Content/plugins/buttons/screen.css" rel="stylesheet" type="text/css" />
<link href="/Content/plugins/link-icons/screen.css" rel="stylesheet" type="text/css" media="screen, projection" />
<link href="/Content/jQueryUI/css/cupertino/jquery-ui-1.8.9.custom.css" rel="stylesheet" type="text/css" />
<link href="/Content/HelpDesk.css" rel="stylesheet" type="text/css" />
<link href="/Content/droppy.css" rel="stylesheet" type="text/css" />
<link href="/Content/tablesorter.css" rel="stylesheet" type="text/css" />
<script src="/Scripts/jquery-1.4.4.min.js" type="text/javascript"></script>
<script src="/Scripts/jquery-ui.min.js" type="text/javascript"></script>
<script src="/Scripts/jquery.validate.unobtrusive.min.js" type="text/javascript"></script>
<script src="/Scripts/jquery.unobtrusive-ajax.min.js" type="text/javascript"></script>
<script src="/Scripts/MicrosoftAjax.js" type="text/javascript"></script>
<script src="/Scripts/MicrosoftMvcAjax.js" type="text/javascript"></script>
<script src="/Scripts/jquery.droppy.js" type="text/javascript"></script>
<script src="/Scripts/jquery.cascadingDropDown.js" type="text/javascript"></script>
<script src="/Scripts/jquery.tablesorter.min.js" type="text/javascript"></script>
<script type='text/javascript'>
    $(function () {
        $('#nav').droppy();
    });
</script>
<script type="text/javascript">
        $(document).ready(function () {
            $("#targetStartDate").datepicker();
            $("#targetEndDate").datepicker();
            $("#ticketsHTMLTable").tablesorter({ sortList: [[0, 0], [1, 0]] });
            $(".fakeLink").mouseover(function () {
                $(this).css("color", "red");
            });
            $(".fakeLink").mouseout(function () {
                $(this).css("color", "black");
            });
        });
</script>
</head>

Here is my View (Razor):

@using (Ajax.BeginForm("Index", "Problem", new AjaxOptions
{
    HttpMethod = "GET",
    UpdateTargetId = "ticketsTable",
    InsertionMode = InsertionMode.Replace

}))
{
       <div class="notice">
        <div class="prepend-1 span-2">
            <label for="targetPriorityID">
                Priority</label>
        </div>
        <div class="prepend-1 span-3">
            <label for="targetStatusID">
                Status</label>
        </div>
        <div class="span-3">
            <label for="targetBusinessUnitID">
                Business Unit</label>
        </div>
        <div class="span-3 prepend-1">
            <label for="targetStartDate">
                Start Date</label></div>
        <div class="span-3 prepend-2">
            <label for="targetEndDate">
                End Date</label></div>
        <div class="prepend-1 span-3 last">
            &nbsp
        </div>        <div class="prepend-1 span-2">
            @Html.DropDownList("targetPriorityID",
new SelectList(ViewBag.Priorities as System.Collections.IEnumerable,
"ID", "Title"), "All", new { @on开发者_如何转开发change = " this.form.submit();" })
        </div>
        <div class="prepend-1 span-3">
            @Html.DropDownList("targetStatusID",
new SelectList(ViewBag.Statuses as System.Collections.IEnumerable,
       "ID", "Title"),"All", new { @onchange="this.form.submit();" })
        </div>
        <div class="span-3">
            @Html.DropDownList("targetBusinessUnitID",
new SelectList(ViewBag.BusinessUnits as System.Collections.IEnumerable,
       "ID", "Title"), "All", new { @onchange = "this.form.submit();" })
        </div>

        <div class="span-3 prepend-1">@Html.TextBox("targetStartDate", "", new { onchange = "this.form.submit();" })</div>
        <div class="span-3 prepend-2">@Html.TextBox("targetEndDate", "", new { onchange = "this.form.submit();" })</div>
        <div class="prepend-1 span-3 last">
            <input type="submit" value="Hide" />
        </div>
        <br />
        <br />
        <br />
    </div>
}
<div id="ticketsTable">
    @Html.Partial("_AllTickets", Model)
</div>

And finally the controller,

    [HttpPost]
    public ActionResult Index(int targetPriorityID = -1, int targetBusinessUnitID = -1, int targetStatusID = -1, string targetStartDate = "", string targetEndDate ="")
    {
        Repository<Priority> priorityRepository = new Repository<Priority>();
        Repository<BusinessUnit> businessUnitRepository = new Repository<BusinessUnit>();
        Repository<Status> statusRepository = new Repository<Status>();

        ViewBag.Priorities = priorityRepository.GetAll();
        ViewBag.BusinessUnits = businessUnitRepository.GetAll();
        ViewBag.Statuses = statusRepository.GetAll();

        var results = problemRepository.GetAll();

        results = (targetPriorityID != -1) ? results.Where(t => t.PriorityID == targetPriorityID) : results;
        results = (targetBusinessUnitID != -1) ? results.Where(t => t.BusinessUnitID == targetBusinessUnitID) : results;
        results = (targetStatusID != -1) ? results.Where(t => t.StatusID == targetStatusID) : results;
        results = (targetStartDate != "") ? results.Where(t => t.DateReported >= DateTime.Parse(targetStartDate)) : results;
        results = (targetEndDate != "") ? results.Where(t => t.DateReported <= DateTime.Parse(targetEndDate)) : results;


        if (Request.IsAjaxRequest())
        {
            return PartialView("__AllTickets", results);
        }

        return View(results);

    }

Any thoughts?

I would suggest you to use normal form that will be AJAXified later:

@using (Html.BeginForm("Index", "Problem")
{
    <div class="notice">
        <div class="prepend-1 span-2">
            <label for="targetPriorityID">Priority</label>
        </div>
        <div class="prepend-1 span-3">
            <label for="targetStatusID">Status</label>
        </div>
        <div class="span-3">
            <label for="targetBusinessUnitID">Business Unit</label>
        </div>
        <div class="span-3 prepend-1">
            <label for="targetStartDate">Start Date</label></div>
        <div class="span-3 prepend-2">
            <label for="targetEndDate">End Date</label>
        </div>
        <div class="prepend-1 span-3 last">
            &nbsp
        </div>        
        <div class="prepend-1 span-2">
            @Html.DropDownList("targetPriorityID", new SelectList(ViewBag.Priorities as System.Collections.IEnumerable, "ID", "Title"), "All")
        </div>
        <div class="prepend-1 span-3">
            @Html.DropDownList("targetStatusID", new SelectList(ViewBag.Statuses as System.Collections.IEnumerable, "ID", "Title"), "All")
        </div>
        <div class="span-3">
            @Html.DropDownList("targetBusinessUnitID", new SelectList(ViewBag.BusinessUnits as System.Collections.IEnumerable, "ID", "Title"), "All")
        </div>

        <div class="span-3 prepend-1">
            @Html.TextBox("targetStartDate", "")
        </div>
        <div class="span-3 prepend-2">
            @Html.TextBox("targetEndDate", "")
        </div>
        <div class="prepend-1 span-3 last">
            <input type="submit" value="Hide" />
        </div>
        <br />
        <br />
        <br />
    </div>
}

<div id="ticketsTable">
    @Html.Partial("_AllTickets", Model)
</div>

and then in a separate file AJAXify it:

$(function() {
    $('form :input').change(function() {
        var form = $('form');
        $.ajax({
            url: form.attr('action'),
            type: form.attr('method'),
            data: form.serialize(),
            success: function(result) {
                $('#ticketsTable').html(result);
            }
        });
    });
});

Another improvement I that I would suggest you is to use view models and get rid of ViewData and use strongly typed helpers.

One problem I can see is that your AJAX options in your Razor view specify the GET HTTP method, but the action filter on the controller action specifies POST.

I wonder if Request.IsAjaxRequest() is causing the problem. I would look at removing that code and always return PartialView("__AllTickets", results); instead.