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POForm posting in MVC4 using AJAX - partialview and ModelState.IsValid and modalbox
 

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  1. POForm posting in MVC4 using AJAX - partialview and ModelState.IsValid and modalbox
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    <p>I'm using ASP.NET MVC4 to create an application and I'm facing an issue regarding AJAX and partial views.</p> <p>Right now, I have a view rendering :</p> <ul> <li>a partial view (called <code>_createUser</code>) which is a modalbox containing a Form to create a user in my application (rendered via <code>@{Html.RenderPartial("_createUser");}</code>)</li> <li>a partial action (called <code>ListUsers</code>) which is an action that simply renders users currently registered in my application (rendered via <code>@{Html.RenderAction("users");}</code> in an html table</li> </ul> <p>When the user clicks a button, the modal box contained in <code>_createUser</code> is displayed via jquery so the user can type informations about a new user. When he clicks on a button in the modal box, the form is submitted via AJAX to an action in my controller which checks <code>ModelState.IsValid</code>.</p> <p>And this is where I'm stuck because I don't know what is the correct way of handling success/error with partial view using jquery because if the model is correct and the registration is correct, I want to refresh only the list of users. Is the model is not valid, I want to refresh the modal box with errors raised by the <code>ModelState</code>.</p> <p>My action is :</p> <pre><code>[HttpPost] [ValidateAntiForgeryToken] public ActionResult Register( RegisterModel model ) { if( ModelState.IsValid ) { try { WebSecurity.CreateUserAndAccount( model.UserName, model.Password ); WebSecurity.Login( model.UserName, model.Password ); ViewBag.CreateUserSucceded = true; return RedirectToAction( "ListUsers" ); } catch (MembershipCreateUserException e) { ModelState.AddModelError( "", ErrorCodeToString( e.StatusCode ) ); } } return PartialView( "_createUser", model ); } </code></pre> <p>My jquery is pretty simple too :</p> <pre><code>function SubmitCreateUserForm() { $.ajax({ type: "POST", url: '@Url.Action("Register")', data: $("#createUserForm").serialize(), success: function (result, status, jqXHR) { ???? } }); } </code></pre> <p>I think the correct way should be to use JSON and, instead of returning and <code>ActionResult</code>, I should return some JSON containing for a status field and the data related to my users list or validation errors and using the status field to know which part of my main view must be updated. By I really don't know how to mix JSON result and a razor view. Any clue?</p> <p><strong>Updated (I can't answer my own question right now or I have to wait 8 hours).</strong></p> <p>Ok, I ended up using what I found in this link <a href="http://craftycodeblog.com/2010/05/15/asp-net-mvc-render-partial-view-to-string/" rel="nofollow">http://craftycodeblog.com/2010/05/15/asp-net-mvc-render-partial-view-to-string/</a></p> <p>It's pretty straightforward and does the job really well!</p>
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    1. COYou can use `ActionResult` and return JSON... `return Json(model);` then you'll need to build html in your success handler and insert into a div you defined in your Razor view.
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    2. COBy doing so, I'm going to loose advantages of `RenderPartial`, that is to say the natural ability of MVC to do the html construction from a model, don't you think?
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    3. COYes, with JSON you'd build html on the client side which would mean you can't take advantage of a strongly-typed PartialView.
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