ASP.NET MVC 2的客户端验证规则不被创建 [英] ASP.NET MVC 2 client-side validation rules not being created

问题描述

MVC不生成视图模型我在客户端验证规则。该HTML只包含这样的：

MVC isn't generating the client-side validation rules for my viewmodel. The HTML just contains this:

<script type="text/javascript">
//<![CDATA[
if (!window.mvcClientValidationMetadata) { window.mvcClientValidationMetadata = []; }
window.mvcClientValidationMetadata.push({"Fields":[],"FormId":"form0","ReplaceValidationSummary":false});
//]]>
</script>

注意字段[] 是空的！

我的看法是强类型，并使用新的强类型HTML辅助（ TextBoxFor（）等）。

My view is strongly-typed and uses the new strongly-typed HTML helpers (TextBoxFor(), etc).

public class ItemFormViewModel
{
    public Item Item { get; set; }
    [Required] [StringLength(100)] public string Whatever { get; set; } // for demo
}
[MetadataType(typeof(ItemMetadata))]
public class Item
{
    public string Name { get; set; }
    public string SKU { get; set; }
    public int QuantityRequired { get; set; }
    // etc.
}
public class ItemMetadata
{
    [Required] [StringLength(100)] public string Name { get; set; }
    [Required] [StringLength(50)] public string SKU { get; set; }
    [Range(0, Int32.MaxValue)] public int QuantityRequired { get; set; }
    // etc.
}

（我知道我使用的是域模型的我的/我的的视图模型，这是不是一个好的做法的一部分，但无视现在。）

(I know I'm using a domain model as my / as part of my view model, which isn't a good practice, but disregard that for now.)

<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" 
Inherits="System.Web.Mvc.ViewPage<ItemFormViewModel>" %>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <h2>Editing item: <%= Html.Encode(Model.Item.Name) %></h2>

    <% Html.EnableClientValidation(); %>
    <%= Html.ValidationSummary("Could not save the item.") %>

    <% using (Html.BeginForm()) { %>

        <%= Html.TextBoxFor(model => model.Item.Name) %>
        <%= Html.TextBoxFor(model => model.Item.SKU) %>
        <%= Html.TextBoxFor(model => model.Item.QuantityRequired) %>

        <%= Html.HiddenFor(model => model.Item.ItemID) %>

        <%= Html.TextBox("Whatever", Model.Whatever) %>
    <input type="submit" value="Save" />
    <% } %>
</asp:Content>

我包括在视图模型的属性，因为我怀疑MVC没有递归检查 ItemFormViewModel.Item <的子属性/ code>，但即使没有被验证？我甚至试过钻研MVC框架源$ C ​​$ C，但都拿出了空。可能是什么回事？

I included the Whatever property on the view model because I suspected that MVC wasn't recursively inspecting the sub-properties of ItemFormViewModel.Item, but even that isn't being validated? I've even tried delving into the MVC framework source code but have come up empty. What could be going on?

推荐答案

大约5秒钟后我张贴的问题时，我意识到的东西：我的观点没有 ValidationMessage 占位符的任何地方。我加了＆LT;％= Html.ValidationMessageFor（型号=＆GT; model.Item.Name）％GT; 你瞧，MVC添加验证规则 Item.Name 来在页面底部的JS块。

About five seconds after I posted the question, I realized something: My view didn't have ValidationMessage placeholders anywhere. I added <%= Html.ValidationMessageFor(model => model.Item.Name) %> and lo and behold, MVC added validation rules for Item.Name to the JS block at the bottom of the page.

原来，MVC不发出客户端验证规则字段的除非您实际执行下列操作之一：

It turns out that MVC does not emit client-side validation rules for a field unless you actually do one of the following:

1. 呼叫 Html.ValidationMessage（）的属性。


2. 呼叫 Html.Validate（）的财产。 （这一次将不会输出错误信息）


3. 使用渲染的控件 Html.EditorForModel（）。 （源）

1. Call Html.ValidationMessage() for the property.
2. Call Html.Validate() for the property. (This one won't output error messages)
3. Render the controls using Html.EditorForModel(). (source)

做任何这些告诉MVC中，我的视图模型的这种特性是由用户可编辑的，所以你应该确认它。只使用HTML辅助贴在页面上的文本框 - 即使你使用新的强类型的帮手 - 是不够的。

Doing any of these tells MVC, "This property of my viewmodel is editable by the user, so you should be validating it." Just using the HTML helper to stick a textbox on the page -- even if you're using the new strongly-typed helpers -- isn't enough.

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