Dataannotation validating property with Javascript plugin. ASP.NET MVC

Question

I need to validate a field of my model that has a text editor in Javascript. So far so good, because the problem only occurs in the registration that I do not receive in the parameter of the Action "Create" an object, and yes a FormCollection. In the case of my Edit, I receive an instantiated Object, in case the edited object with all filled properties and Dataannotation works perfectly.

I tried to get my Create to use this Binding to receive in Action by parameter the object with the properties set, works, however mine ModelState.IsValid is always false because it has required properties that Seto within this Action, so Modelstate only checks when it enters Action and doesn’t update anymore (I tried TryUpdateModel() and it doesn’t work either).

What I need is to know how to make it work with Formcollection or Binding, each of which has its problem in my case. I will post the case and you will please review.

Model:

public class News
    {
        public int IdNews { get; set; }

        [DisplayName("*Título:")]
        [RegularExpression(@"^[0-9a-zA-Z\-\sãâáàéèêíìîõôóòûúùç]{1,50}$", ErrorMessage = "Apenas letras ou números são aceitos.")]
        [Required(ErrorMessage = "Defina o título.")]
        public string Title { get; set; }

        [DisplayName("*Descrição:")]
        [StringLength(5000, MinimumLength = 100, ErrorMessage = "A descrição deve conter no mínimo 100 caracteres e no máximo 5000.")]
        [Required(ErrorMessage = "Escreva a descrição.")]
        [UIHint("tinymce_jquery_full"), AllowHtml]        
        public string Description { get; set; }

        [DisplayName("*Data de postagem:")]        
        [DisplayFormat(DataFormatString = "{0: dd/MM/yyyy}")]
        public DateTime PostDate { get; set; }

        //[Required(ErrorMessage = "Escreva o nome do Administrador que esta postando.")]
        public string AdminName { get; set; }

        [DisplayName("Selecione uma imagem:")]
        public string ImagePath { get; set; }
    }

Action:

[HttpPost]
        [ValidateInput(false)]
        [ValidateAntiForgeryToken]
        public ActionResult Create(FormCollection form)
        {
            News news = new News()
            {
                Title = (form["title"] as string) ?? String.Empty,
                Description = (form["description"] as string) ?? String.Empty,
                PostDate = DateTime.Now,
                AdminName = AdminModel.UserLogged.Name ?? String.Empty,
            };

            if (ModelState.IsValid)
            {
                if (Request.Files["fileUpload"].ContentLength > 0)
                {
                    PhotoController pCon = new PhotoController();
                    news.ImagePath = pCon.NewsFile(Request.Files, news);
                }
                else
                    news.ImagePath = String.Empty;

                using (NewsDAO dao = new NewsDAO())
                {
                    if (dao.SaveNews(news))
                    {
                        ViewBag.AlertMessage = ("Notícia inserida com sucesso!");
                        return View();
                    }
                }
            }
            ViewBag.AlertMessage = "Erro ao inserir notícia.";
            return View(news);
        }

View:

@model BraveryBranded.ASP.Areas.Admin.Models.News

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")

    <script type="text/javascript" src="~/Scripts/tinymce/tinymce.min.js"></script>
    <script type="text/javascript">
        tinymce.init({
            selector: "textarea",
            plugins: [
            "advlist autolink link lists charmap print preview hr anchor pagebreak spellchecker",
            "searchreplace wordcount visualblocks visualchars code fullscreen insertdatetime media image nonbreaking",
            "save table contextmenu directionality emoticons template paste textcolor"
            ],
            width: 700,
            height: 250,
        });
    </script>

    @if (!String.IsNullOrEmpty(ViewBag.AlertMessage))
    {
        <text>
            <script type="text/javascript">
                alert('@Html.Raw(ViewBag.AlertMessage)');
            </script>
        </text>
        ViewBag.AlertMessage = String.Empty;
    }
}

@{
    ViewBag.Title = "Nova notícia";
}

<h2>@ViewBag.Title</h2>
<hr />
@using (Html.BeginForm("Create", "News", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    @Html.AntiForgeryToken()
    @Html.ValidationSummary(true)

    <fieldset>
        <legend>News</legend>

            @Html.HiddenFor(model => model.IdNews)
        <div class="editor-label">
            *Título:
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Title)
            @Html.ValidationMessageFor(model => model.Title)
        </div>
        <br />
        <div class="editor-label">
            Selecione uma imagem (imagem que representa o post na página inicial):
        </div>
        <div class="editor-field">
            <input type="file" name="fileUpload" accept="image/jpg, image/jpeg, image/png" id="file_upload" />
            @Html.ValidationMessageFor(model => model.ImagePath)
        </div>
        <br />
        <div class="editor-label">
            *Descrição (deve conter entre 100 e 5000 caracteres):
        </div>
        <div class="editor-field">
            @Html.TextAreaFor(model => model.Description, new { @style="height:180px; width:550px;", @required="required" })
            @Html.ValidationMessageFor(model => model.Description)
        </div>
        <br />
        <p>
            <button type="submit" class="btn btn-success" onclick="return confirm('Revise o nome da galeria antes de confirmar');">Adicionar</button>
        </p>
    </fieldset>
}

<div>
    @Html.ActionLink("Voltar para a lista", "List", null, new { @class = "btn btn-sm btn-primary" })
</div>

Print to help understanding:

Another question is also why in the case of the title, it "checks" if it is filled in before entering the controller and in the case of the description, does it enter the controller first? I checked this with a breakpoint.

Answer 1

This here:

@Html.HiddenFor(model => model.IdNews)

Does the ModelState try to validate the key IdNews, which has no value in the Action Create.

Remove the hidden and test the validation again.