动态页面上的ASP.NET MVC 2验证

时间:2013-01-02 14:50:31

标签: c# jquery .net asp.net-mvc-2 asp.net-mvc-validation

我的asp.net mvc 2应用程序上有多个页面的注册向导。在第一页上,我应该有参与该过程的人员的基本数据形式。我应该有3个标记为名字,姓氏和地址的文本框,以及1个带有“添加其他人”文本的复选框。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,因此我们可以以相同的形式添加多个人。从理论上讲,我们应该能够插入尽可能多的人。所有字段都是必填字段,因此在页面顶部的验证摘要中,我应该有类似“请输入第二人的名字”之类的东西。我有DTO课程:

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

我想这个页面的模型应该是List<Person>,我会用javascript / jQuery为新人添加html。请在这里帮助我,我该如何验证这个动态页面?我可以使用“保存”和“返回”按钮浏览此向导,此外,我们应该能够取消单击页面上的任何单选按钮,并且该特定人员应该消失,验证者不应再抓住它。我的整个向导都使用服务器端验证(DataAnnotations),我不想使用客户端验证。提前谢谢。

更新:

我还需要一些帮助。我想用新属性扩展Person类:

public int Percent { get; set; } 

如果IEnumerable<Person>中每个人的所有百分比总和等于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以及如何创建自定义属性?我的模型是通用列表,我不能在其上应用[CustomAttribute],对吧? 此外,我应该在页面顶部有验证摘要,而不是在每个输入之后。我放了:<%:Html.ValidationSummary(false, "Please correct the following and resubmit the page:")%>有没有办法为每个人设置不同的验证消息?感谢

1 个答案:

答案 0 :(得分:3)

在开始执行此任务之前,我强烈建议您阅读Steven Sanderson的Editing a variable length list, ASP.NET MVC 2-style

准备好了吗?

好的,现在我们可以进入实施。

首先要定义我们的任务视图模型。您已经拥有它,只需在其上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; }
}
  

我想这个页面的模型应该是List

是的,绝对。

让我们继续创建我们的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:此处使用的Html.BeginCollectionItem助手取自史蒂芬桑德森的博客文章,我已将其链接到我之前的答案中,您已经阅读并熟悉了该文章。这是完整性的源代码:

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:

我的不好,我刚刚注意到您的问题标有asp.net-mvc-2。所以我想我的Razor观点不适用于你的情况。不过,其他一切都应该是一样的。您需要做的就是更新视图,以便他们使用WebForms视图引擎:

这是~/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>