ASP.. NET MVC 2动态页面验证

本文关键字：验证 动态 NET MVC ASP | 更新日期: 2023-09-27 17:50:19

我有注册向导在我的asp.net mvc 2应用程序与多个页面。在第一页上，我应该有参与这个过程的人的基本数据形式。我应该有3个文本框标记为名字，姓氏和地址，和1复选框与文本"添加另一个人"。当用户单击单选按钮时，将出现带有新单选按钮的新文本框，因此我们可以在同一表单中添加多个人员。理论上，我们应该能够尽可能多地插入人员。所有字段都是强制性的，所以在页面顶部的验证摘要中，我应该有类似于"请输入第二个人的名字"之类的内容。我有DTO类:

public class Person
{
     public string FullName { get; set; }
     public string LastName { get; set; }
     public string Address{ get; set; }
}

，我想我的这个页面的模型应该是List<Person>，我会添加html与javascript/jQuery的新人。请在这里帮助我，我应该如何验证这个动态页面?我可以通过保存和后退按钮来完成这个向导，我们应该能够取消点击页面上的任何单选按钮，那个特定的人应该消失，验证器应该不会再捕获它了。我的整个向导使用服务器端验证(DataAnnotations)，我不想使用客户端验证。提前谢谢。

更新:

我需要更多的帮助。我想用新属性扩展Person类: 
public int Percent { get; set; }

，如果IEnumerable<Person>中每个person中的所有百分比之和等于100，我希望在提交时进行服务器验证。我可以为此创建自定义属性吗?如何创建?我的型号是generic List，我不能在上面应用[CustomAttribute]，对吗?
此外，我应该在页面的顶部有验证摘要，而不是在每个输入之后。我已经放了:<%:Html.ValidationSummary(false, "Please correct the following and resubmit the page:")%>是否有办法为每个人设置不同的验证消息?由于

ASP.. NET MVC 2动态页面验证

在开始执行此任务之前，我强烈建议您阅读编辑可变长度列表，ASP。. NET MVC 2-style from Steven Sanderson.

准备好了吗?

好了，现在我们可以进入实现了

第一件事是为任务定义视图模型。您已经拥有了它，只需定义相应的验证规则:

public class Person
{
    [Required]
    public string FullName { get; set; }
    [Required]
    public string LastName { get; set; }
    [Required]
    public string Address{ get; set; }
}

，我想我这个页面的模型应该是List

年,当然。

我们来创建PersonsController:

public class PersonsController : Controller
{
    public ActionResult Index()
    {
        var model = new[] 
        {
            new Person()
        };
        return View(model);
    }
    [HttpPost]
    public ActionResult Index(IEnumerable<Person> persons)
    {
        if (!ModelState.IsValid)
        {
            return View(persons);
        }
        // To do: do whatever you want with the data
        // In this example I am simply dumping it to the output
        // but normally here you would update your database or whatever
        // and redirect to the next step of the wizard
        return Content(string.Join(Environment.NewLine, persons.Select(p => string.Format("name: {0} address: {1}", p.FullName, p.Address))));
    }
    public ActionResult BlankEditorRow()
    {
        return PartialView("_PersonEditorRow", new Person());
    }
}

现在让我们定义视图(~/Views/Persons/Index.cshtml):

@model IEnumerable<Person>
@using (Html.BeginForm())
{
    <div id="editorRows">
        @foreach (var item in Model)
        {
            Html.RenderPartial("_PersonEditorRow", item);
        }
    </div>    
    @Html.ActionLink(
        "Add another person", 
        "BlankEditorRow", 
        null, 
        new { id = "addItem" }
    )
    <p>
        <button type="submit">Next step</button>
    </p>
}
<script type="text/javascript">
    $('#addItem').click(function () {
        $.ajax({
            url: this.href,
            cache: false,
            success: function (html) { $('#editorRows').append(html); }
        });
        return false;
    });
    $(document).delegate('a.deleteRow', 'click', function () {
        $(this).parents('div.editorRow:first').remove();
        return false;
    });
</script>

和相应的部分视图(~/Views/Persons/_PersonEditorRow.cshtml):

@model Person
<div class="editorRow">
    @using(Html.BeginCollectionItem("persons")) 
    {
        <div>
            @Html.LabelFor(x => x.FullName)
            @Html.EditorFor(x => x.FullName)
            @Html.ValidationMessageFor(x => x.FullName)
        </div>
        <div>
            @Html.LabelFor(x => x.LastName)
            @Html.EditorFor(x => x.LastName)
            @Html.ValidationMessageFor(x => x.LastName)
        </div>
        <div>
            @Html.LabelFor(x => x.Address)
            @Html.EditorFor(x => x.Address)
            @Html.ValidationMessageFor(x => x.Address)
        </div>
        <a href="#" class="deleteRow">delete</a>
    }
</div>

备注:这里使用的Html.BeginCollectionItem助手取自Steven Sanderson的博客文章，我在之前的回答中已经链接到，您已经阅读并熟悉了。下面是完整的源代码:

public static class HtmlPrefixScopeExtensions
{
    private const string idsToReuseKey = "__htmlPrefixScopeExtensions_IdsToReuse_";
    public static IDisposable BeginCollectionItem(this HtmlHelper html, string collectionName)
    {
        var idsToReuse = GetIdsToReuse(html.ViewContext.HttpContext, collectionName);
        string itemIndex = idsToReuse.Count > 0 ? idsToReuse.Dequeue() : Guid.NewGuid().ToString();
        // autocomplete="off" is needed to work around a very annoying Chrome behaviour whereby it reuses old values after the user clicks "Back", which causes the xyz.index and xyz[...] values to get out of sync.
        html.ViewContext.Writer.WriteLine(string.Format("<input type='"hidden'" name='"{0}.index'" autocomplete='"off'" value='"{1}'" />", collectionName, html.Encode(itemIndex)));
        return BeginHtmlFieldPrefixScope(html, string.Format("{0}[{1}]", collectionName, itemIndex));
    }
    public static IDisposable BeginHtmlFieldPrefixScope(this HtmlHelper html, string htmlFieldPrefix)
    {
        return new HtmlFieldPrefixScope(html.ViewData.TemplateInfo, htmlFieldPrefix);
    }
    private static Queue<string> GetIdsToReuse(HttpContextBase httpContext, string collectionName)
    {
        // We need to use the same sequence of IDs following a server-side validation failure,  
        // otherwise the framework won't render the validation error messages next to each item.
        string key = idsToReuseKey + collectionName;
        var queue = (Queue<string>)httpContext.Items[key];
        if (queue == null)
        {
            httpContext.Items[key] = queue = new Queue<string>();
            var previouslyUsedIds = httpContext.Request[collectionName + ".index"];
            if (!string.IsNullOrEmpty(previouslyUsedIds))
                foreach (string previouslyUsedId in previouslyUsedIds.Split(','))
                    queue.Enqueue(previouslyUsedId);
        }
        return queue;
    }
    private class HtmlFieldPrefixScope : IDisposable
    {
        private readonly TemplateInfo templateInfo;
        private readonly string previousHtmlFieldPrefix;
        public HtmlFieldPrefixScope(TemplateInfo templateInfo, string htmlFieldPrefix)
        {
            this.templateInfo = templateInfo;
            previousHtmlFieldPrefix = templateInfo.HtmlFieldPrefix;
            templateInfo.HtmlFieldPrefix = htmlFieldPrefix;
        }
        public void Dispose()
        {
            templateInfo.HtmlFieldPrefix = previousHtmlFieldPrefix;
        }
    }
}
更新:

我的错，我刚刚注意到你的问题被标记为asp.net-mvc-2。所以我猜我的剃刀观点不适用于你的情况。不过，其他一切都应该是一样的。你所需要做的就是更新视图，让它们使用WebForms视图引擎:

~/Views/Persons/Index.aspx:

<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<IEnumerable<Person>>" %>
<% using (Html.BeginForm()) { %>
    <div id="editorRows">
        <% foreach (var item in Model) { %>
            <% Html.RenderPartial("_PersonEditorRow", item); %>
        <% } %>
    </div>    
    <%= Html.ActionLink(
        "Add another person", 
        "BlankEditorRow", 
        null, 
        new { id = "addItem" }
    ) %>
    <p>
        <button type="submit">Next step</button>
    </p>
<% } %>
<script type="text/javascript">
    $('#addItem').click(function () {
        $.ajax({
            url: this.href,
            cache: false,
            success: function (html) { $('#editorRows').append(html); }
        });
        return false;
    });
    $(document).delegate('a.deleteRow', 'click', function () {
        $(this).parents('div.editorRow:first').remove();
        return false;
    });
</script>

，最后是(~/Views/Persons/_PersonEditorRow.ascx)部分:

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<Person>" %>
<div class="editorRow">
    <% using(Html.BeginCollectionItem("persons")) { %>
        <div>
            <%= Html.LabelFor(x => x.FullName) %>
            <%= Html.EditorFor(x => x.FullName) %>
            <%= Html.ValidationMessageFor(x => x.FullName) %>
        </div>
        <div>
            <%= Html.LabelFor(x => x.LastName) %>
            <%= Html.EditorFor(x => x.LastName) %>
            <%= Html.ValidationMessageFor(x => x.LastName) %>
        </div>
        <div>
            <%= Html.LabelFor(x => x.Address) %>
            <%= Html.EditorFor(x => x.Address) %>
            <%= Html.ValidationMessageFor(x => x.Address) %>
        </div>
        <a href="#" class="deleteRow">delete</a>
    <% } %>
</div>
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