从控制器MVC ASP 4的列表框中获取项目
本文关键字:获取 项目 列表 控制器 MVC ASP | 更新日期: 2023-09-27 18:14:29
我有一个可以创建频道的页面。频道有与之相关的类型。
CreateChannel.cshtml
<h2>Create Channel</h2>
<div class="row-fluid">
<div>
@{
using (Html.BeginForm("CreateNewChannel", "Channel", new { channelId = Model.Id, userId = @Session["userId"] }, FormMethod.Post))
{
@Html.HiddenFor(model => model.Id)
<h5>Name</h5>
@Html.TextBoxFor(model => model.Name, new { @class = "input-block-level pull-left", type = "text", required = "required", placeholder = "Channel Name", style = "width: 400px" })
@Html.ValidationMessageFor(model => model.Name, null, new { @class = "txt-error error-field", style = "padding-top: 4px" })
<div class="clearfix"></div>
<div style="width: 400px" class="input-block-level">
<h5 style="">Description</h5>
<div class="input-block-level">
@Html.TextAreaFor(model => model.Description, 5, 60, new { @class = "input-block-level", type = "textarea", required = "required", placeholder = "Description" })
</div>
</div>
@Html.Action("SelectGenre", new { channelId = -1 })
<button class="btn">Create</button>
}
}
</div>
视图SelectGenre。CSHTML看起来像这样:
<div id="genreDiv">
@Html.ListBoxFor(model => model.AvailableGenres, new MultiSelectList(Model.AvailableGenres, "Id", "Name"), new { size = "10" })
<input id="btnAddAll" type="button" value=" >> " onclick="addallItems();" />
<input id="btnAdd" type="button" value=" > " onclick="addItem();" />
<input id="btnRemove" type="button" value=" < " onclick="removeItem();" />
<input id="btnRemoveAll"type="button" value=" << " onclick="removeallItems();" />
@Html.ListBoxFor(model => model.ChosenGenres, new MultiSelectList(Model.ChosenGenres, "Id", "Name"), new { size = "10" })
</div>
<script type="text/javascript">
function addItem() {
$("#AvailableGenres option:selected").appendTo("#ChosenGenres");
$("#ChosenGenres option").attr("selected", false);
}
function addallItems() {
$("#AvailableGenres option").appendTo("#ChosenGenres");
$("#ChosenGenres option").attr("selected", false);
}
function removeItem() {
$("#ChosenGenres option:selected").appendTo("#AvailableGenres");
$("#AvailableGenres option").attr("selected", false);
}
function removeallItems() {
$("#ChosenGenres option").appendTo("#AvailableGenres");
$("#AvailableGenres option").attr("selected", false);
}
</script>
控制器看起来像这样:
public class ChannelController : Controller
{
public SelectGenreModel GetGenreModel(int channelId)
{
List<GuiGenre> chosenGenres;
List<GuiGenre> availableGenres;
using (RentItServiceClient proxy = new RentItServiceClient())
{
chosenGenres = GuiClassConverter.ConvertGenres(proxy.GetGenresForChannel(channelId));
availableGenres = GuiClassConverter.ConvertGenres(proxy.GetAllGenres()).Except(chosenGenres).ToList();
}
SelectGenreModel model = new SelectGenreModel
{
AvailableGenres = availableGenres,
ChosenGenres = chosenGenres,
ChannelId = channelId,
};
return model;
}
public PartialViewResult SelectGenre(int channelId)
{
return PartialView(GetGenreModel(channelId));
}
}
public ActionResult CreateNewChannel(GuiChannel channel, int? userId, SelectGenreModel model)
{
if (userId.HasValue)
{
channel.OwnerId = userId.Value;
int channelId;
using (RentItServiceClient proxy = new RentItServiceClient())
{
channelId = proxy.CreateChannel(channel.Name, userId.Value, channel.Description, new string[0]);
}
return RedirectToAction("SelectChannel", new { channelId = channelId, userId = userId });
}
return RedirectToAction("Index", "Home");
}
SelectGenreModel看起来像这样:
public class SelectGenreModel
{
public List<GuiGenre> AvailableGenres { get; set; }
public List<GuiGenre> ChosenGenres { get; set; }
public int ChannelId { get; set; }
}
当我提交表单时,SelectGenreModel中的两个列表都为null。
如何将这些列表传递给视图?
不进行反序列化的原因是返回的表单数据与MVC期望的数组映射的格式不匹配。
接近你想要完成的,我建议创建另一个模型来表示表单发布的数据。在本例中:
public class SelectedGenrePostModel
{
public int ChannelId { get; set; }
public List<int> ChosenGenres { get; set; }
}
在你的视图中,有一个javascript钩子到提交事件,自动选择所有的选项在chosengenre,所以他们是正确的返回根据你的UI正在做什么。
<script type="text/javascript">
$(function () {
// this event fires when the browser is about to submit a form
$('#GenreForm').submit(function () {
// modifies the 'selected' options on the list
// before finally being submitted by the browser
$('#ChosenGenres option').prop('selected', true);
});
});
</script>
然后,如果你绝对需要SelectGenreModel,你可以使用你的服务调用和通过SelectedGenrePostModel发回的数据重新填充。
public ActionResult CreateNewChannel(GuiChannel channel, int? userId, SelectGenrePostModel model)
{
if (userId.HasValue)
{
// do work here
return RedirectToAction("SelectChannel", new { channelId = channelId, userId = userId });
}
return RedirectToAction("Index", "Home");
}