I’m having a problem getting a form to work without javascript being enabled.
This should be enough to go on, ask if you need to know anything else – I don’t want to just put the whole solution up here!
~/Views/_ViewStart.cshtml:
@{ Layout = "~/Views/Shared/Layout.cshtml"; }
~/Views/Shared/Layout.cshtml:
@using System.Globalization; @{ CultureInfo culture = CultureInfo.GetCultureInfo(UICulture); }<!DOCTYPE html>
<html lang="@culture.Name" dir="@(culture.TextInfo.IsRightToLeft ? "rtl" : "ltr")">
<head>
<title>AppName :: @ViewBag.Title</title>
<link href="@Url.Content("~/favicon.ico")" rel="shortcut icon" type="image/x-icon" />
<link href="@Url.Content("~/apple-touch-icon.png")" rel="apple-touch-icon" />
<link href="@Url.Content("~/Content/css/site.css")" rel="stylesheet" type="text/css" />
<script src="@Url.Content("~/Content/js/jquery-1.6.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Content/js/jquery.unobtrusive-ajax.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Content/js/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Content/js/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Content/js/app.js")" type="text/javascript"></script>
@RenderSection("SectionHead", false)
</head>
<body>
<div id="page-container">
<div id="nav">
<div id="nav-user">
@{ Html.RenderAction("LoginStatus", "Account"); }
@{ Html.RenderPartial("CultureSelector"); }
</div>
</div>
<div id="page-content">
<h2>@ViewBag.Title</h2>
@RenderBody()
</div>
</div>
</body>
</html>
~/Views/Account/Index.cshtml:
@model AccountFilterModel
@{
ViewBag.Title = "Account Home";
var loadingId = "loading" + new Random().Next();
Model.FilterFormId = "filter-account-form";
}
@using (Ajax.BeginForm("List", "Account", Model, new AjaxOptions { UpdateTargetId = "result-list", LoadingElementId = loadingId }, new { id = "filter-account-form" })) {
<!-- form controls and validation summary stuff -->
<input id="filter" type="submit" value="Filter" />
<span id="@loadingId" style="display: none">
<img src="@Url.Content("~/Content/images/ajax-loader.gif")" alt="Loading..." />
</span>
}
<div id="result-list">
@{ Html.RenderAction("List", Model); }
</div>
~/Views/Account/List.cshtml:
@model FilterResultModel
@helper SortLink(AccountSort sort, SortDirection dir) {
string display = (dir == SortDirection.Ascending ? "a" : "d"); // TODO: css here
if (Model.Filter.SortBy != null && ((AccountSortModel)Model.Filter.SortBy).Sort == sort && dir == Model.Filter.SortOrder) {
@:@display
} else {
FilterModel fm = new FilterModel(Model.Filter);
fm.SortBy = AccountSortModel.SortOption[sort];
fm.SortOrder = dir;
<a href="@Url.Action("Index", "Account", fm.GetRouteValueDictionary())" onclick="@(string.Format("setFormValue('{0}', '{1}', '{2}'); setFormValue('{0}', '{3}', '{4}'); formSubmit('{0}'); return false;", Model.Filter.FilterFormId, Html.PropertyNameFor(x => x.Filter.SortOrder), dir, "AccountSort", sort))">@display</a>
}
}
@if (Model.Results.Count > 0) {
var first = Model.Results.First();
<table>
<caption>
@string.Format(LocalText.FilterStats, Model.FirstResultIndex + 1, Model.LastResultIndex + 1, Model.CurrentPageIndex + 1, Model.LastPageIndex + 1, Model.FilteredCount, Model.TotalCount)
</caption>
<thead>
<tr>
<th>
@Html.LabelFor(m => first.Username)
<span class="sort-ascending">
@SortLink(AccountSort.UsernameLower, SortDirection.Ascending)
</span>
<span class="sort-descending">
@SortLink(AccountSort.UsernameLower, SortDirection.Descending)
</span>
</th>
<!-- other table headers -->
</tr>
</thead>
<tbody>
@foreach (AccountModel account in Model.Results) {
<tr>
<td>@Html.EncodedReplace(account.Username, Model.Filter.Search, "<span class=\"filter-match\">{0}</span>")</td>
<!-- other columns -->
</tr>
}
</tbody>
</table>
Html.RenderPartial("ListPager", Model);
} else {
<p>No Results</p>
}
Relevant part of AccountController.cs:
public ActionResult Index(AccountSort? accountSort, FilterModel model = null) {
FilterModel fm = model ?? new FilterModel();
if (accountSort.HasValue) fm.SortBy = AccountSortModel.SortOption[accountSort.Value];
return View(fm);
}
public ActionResult List(AccountSort? accountSort, FilterModel model = null) {
FilterModel fm = model ?? new FilterModel();
if (accountSort.HasValue) fm.SortBy = AccountSortModel.SortOption[accountSort.Value];
return Request.IsAjaxRequest() ? (ActionResult)PartialView("List", Service.Get(fm)) : View("Index", model);
}
With javascript enabled, this works fine – the content of div#result-list is updated as expected.
If I don’t do the Request.AjaxRequest() and just return the PartialView, then with javascript disabled I get a page with just the content of the results on it. If I have the code as above, then I get a StackOverflowException.
How do I get this to work?
Solution
Thanks to @xixonia, I discovered the problem – here is my solution:
public ActionResult List(AccountSort? accountSort, FilterModel model = null) {
FilterModel fm = model ?? new FilterModel();
if (accountSort.HasValue)
fm.SortBy = AccountSortModel.SortOption[accountSort.Value];
if (Request.HttpMethod == "GET")
return PartialView("List", Service.Get(fm));
if (Request.HttpMethod == "POST")
return Request.IsAjaxRequest() ? (ActionResult) PartialView("List", Service.Get(fm)) : RedirectToAction("Index", model);
return new HttpStatusCodeResult((int) HttpStatusCode.MethodNotAllowed);
}
You can use the following extension method to determine if the request is an ajax request
If it is, you can return a partial view, otherwise you can return a full view or redirect.
edit: here’s the problem:
The “List” is returning the “Index” view when the request is not an AJAX request:
The “Index” view is rendering the “List” action:
AKA: Recursion.
You need to engineer a way to display your list without drawing the index page, or make your index page draw a partial view with your list modal as a parameter.