Does Html.ValidationSummary not always work?

Question

ASP.NET

Good day.
The project has forms that are validated using the ValidationSummary - class (System.Web.UI.WebControls). For example,

@using (Html.BeginForm("Edit", "Account"))
{
     @Html.ValidationSummary(true)
     <td>@Html.LabelFor(model => model.MobilePhone)</td>
     <td>
          @Html.TextBoxFor(model => model.MobilePhone)
          @Html.ValidationMessageFor(model => model.MobilePhone)
     </td>
}

Later, I rewrote the Html.BeginForm method and got Html.PopUpFormBegin("Edit", "Account") and Html.PopUpFormEnd()

@Html.PopUpFormBegin("Edit", "Account")
     @Html.ValidationSummary(false)
     <tr>
        <td>Дата открытия регистрации с</td>
        <td>@Html.TextBoxFor(m => m.DateStart)
            @Html.ValidationMessageFor(m => m.DateStart)</td>
    </tr>
@Html.PopUpFormEnd()

This is a partial view. It returns to the main page in a pop-up window with ajax using Json.
If you view the code in a firebug, no attributes are added to the text field.
Tell me what could be the problem? In the case of Html.BeginForm, everything is ok.

Answer 1

Here's what your helper might look like, which can be used with using:

public static MvcForm PopUpForm(this HtmlHelper htmlHelper, string actionName, string controllerName, string validation = "", string idContent = null)
{
    return htmlHelper.BeginForm(actionName, controllerName, FormMethod.Post, new { onSubmit="return PopUpWindow.ExecuteForm(this, '" + validation + "', '" + idContent + "');" });
}

Answer 2

Are jquery.validate.unobtrusive.js and jquery.validate.js included?