このブログ投稿には、それを実現する方法を説明するステップバイステップガイドが含まれています。
アップデート：
コメントセクションで要求されたように、私は前述の記事をあなたのシナリオに適応させる方法を段階的に説明しています。
モデル：
public class MyOtherModelObject
{
public string Name { get; set; }
public string Description { get; set; }
}
public class MyModelObject
{
public int Id { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public List<MyOtherModelObject> OtherModelObjects { get; set; }
}
コントローラ：
public class HomeController : Controller
{
public ActionResult Index()
{
var model = new MyModelObject
{
Id = 1,
Name = "the model",
Description = "some desc",
OtherModelObjects = new[]
{
new MyOtherModelObject { Name = "foo", Description = "foo desc" },
new MyOtherModelObject { Name = "bar", Description = "bar desc" },
}.ToList()
};
return View(model);
}
[HttpPost]
public ActionResult Index(MyModelObject model)
{
return Content("Thank you for submitting the form");
}
public ActionResult BlankEditorRow()
{
return PartialView("EditorRow", new MyOtherModelObject());
}
}
ビュー（~/Views/Home/Index.cshtml）：
@model MyModelObject
@using(Html.BeginForm())
{
@Html.HiddenFor(x => x.Id)
<div>
@Html.LabelFor(x => x.Name)
@Html.EditorFor(x => x.Name)
</div>
<div>
@Html.LabelFor(x => x.Description)
@Html.TextBoxFor(x => x.Description)
</div>
<hr/>
<div id="editorRows">
@foreach (var item in Model.OtherModelObjects)
{
@Html.Partial("EditorRow", item);
}
</div>
@Html.ActionLink("Add another...", "BlankEditorRow", null, new { id = "addItem" })
<input type="submit" value="Finished" />
}
部分的（~/Views/Home/EditorRow.cshtml）：
@model MyOtherModelObject
<div class="editorRow">
@using (Html.BeginCollectionItem("OtherModelObjects"))
{
<div>
@Html.LabelFor(x => x.Name)
@Html.EditorFor(x => x.Name)
</div>
<div>
@Html.LabelFor(x => x.Description)
@Html.EditorFor(x => x.Description)
</div>
<a href="#" class="deleteRow">delete</a>
}
</div>
脚本：
$('#addItem').click(function () {
$.ajax({
url: this.href,
cache: false,
success: function (html) {
$('#editorRows').append(html);
}
});
return false;
});
$('a.deleteRow').live('click', function () {
$(this).parents('div.editorRow:first').remove();
return false;
});
備考：BeginCollectionItemカスタムヘルパーは、私がリンクしたのと同じ記事から取られていますが、完全を期すためにここで提供しています。
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;
}
}
}