我试图将一个小问题最小化，所以我创建了新的示例Web项目; VS中的mvc-empty我在Home控制器中创建了一个名为“Index”的视图。索引视图代码：
@model WebApplication16.ViewModels.Home.IndexVM
@{
ViewBag.Title = "Index";
}
@Html.Partial("~/Views/Home/_Orders.cshtml", Model.Orders)
@section scripts{
<script src="~/Scripts/jquery.validate.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.js"></script>
<script src="~/Scripts/jquery.unobtrusive-ajax.js"></script>
<script>
$("#Type").change(function () {
$('#order-current > img').remove();
var currentOrder = "#Type_" + $("#Type").find('option:selected').text();
var $img = $(currentOrder).clone();
$img.removeClass("hidden");
$("#order-current").append($img);
$("#ajax-form").submit();
});
</script>
}
家庭控制器代码：
public class HomeController : Controller
{
[HttpGet]
public ActionResult Index()
{
IndexVM dataVM = new IndexVM();
GetControlsDataSource(dataVM.Orders);
return View(dataVM);
}
private static void GetControlsDataSource(OrdersVM dataVM)
{
List<SelectListItem> typeControlDataSource = new List<SelectListItem>();
foreach (var en in Enum.GetValues(typeof(TypeEnum)))
{
SelectListItem item = new SelectListItem();
item.Text = en.ToString();
item.Value = ((int)en).ToString();
typeControlDataSource.Add(item);
}
dataVM.TypeControlDataSource = typeControlDataSource;
}
[HttpPost]
public ActionResult Pay(IndexVM dataVM)
{
GetControlsDataSource(dataVM.Orders);
if (ModelState.IsValid)
{
dataVM.Orders.Info = "Info bla bla bla";
return PartialView("~/Views/Home/_Orders.cshtml", dataVM.Orders);
}
else
{
return View(dataVM);
}
}
}
还有一个名为“_Orders”的局部视图，它在Index视图上呈现._Orders局部视图的代码：
@model WebApplication16.ViewModels.Home.OrdersVM
@using (Ajax.BeginForm("Pay", "Home", new AjaxOptions
{
InsertionMode = InsertionMode.Replace,
UpdateTargetId = "result",
}, new { id = "ajax-form" }))
{
<div id="result">
<div id="order-current">
</div>
<div>
@Html.TextBoxFor(x => x.Name, new { @class = "form-control", style = "margin-top:10px;", id = "Name" })
@Html.ValidationMessageFor(x => x.Name)
</div>
<div>
@Html.DropDownListFor(x => x.Type, Model.TypeControlDataSource, new { @class = "form-control", style = "margin-top:10px;", id = "Type", })
@Html.ValidationMessageFor(x => x.Type)
</div>
<div>
<p>@Model.Info</p>
</div>
<button type="submit" class="btn btn-primary" name="ok"> OK</button>
</div>
}
<div id="orders-container">
<img id="Type_I" src="~/App_Images/Type_I.png" class="img-responsive hidden" />
<img id="Type_II" src="~/App_Images/Type_II.png" class="img-responsive hidden" />
<img id="Type_III" src="~/App_Images/Type_III.png" class="img-responsive hidden"/>
</div>
Index model is described by class IndexVM:
public class IndexVM
{
public IndexVM()
{
this.Orders = new OrdersVM();
}
public OrdersVM Orders { get; set; }
}
_Orders模型由OrdersVM类描述：
public class OrdersVM
{
[Required]
public string Name { get; set; }
public string Info { get; set; }
[Required]
public TypeEnum Type { get; set; }
public List<SelectListItem> TypeControlDataSource { get; set; }
}
public enum TypeEnum
{
I,
II,
III
}
在使用id =“Type”的DropDownListFor控件中更改值后，隐藏字段中的图片应该由位于索引视图中的jquery代码注入到具有id =“order-current”的容器中，并且在该操作之后将ajax-form注入应该提交。它工作正常，但在调用后
return PartialView("~/Views/Home/_Orders.cshtml", dataVM.Orders);
，字段Info正确更新，但“order-current”div容器中注入的图片消失了。我尝试使用F12按钮查看Google Chrome中的错误，并且没有错误，但在“browserLink”脚本中出现了无限循环。我无法解释原因。 我想要的是在提交ajax-form之后在容器中看到注入的图片，其中id =“order-current”。怎么做以及我做错了什么？
答案 0 :(得分：0)
感谢我的朋友，我终于解决了这个问题。更新“result”容器后，将取消固定jQuery添加到此容器中的控件的所有事件。这就是崩溃的原因。 使其正常工作的方法是创建一个函数并将其固定到AjaxBeginForm的事件OnComplete上。每次通过ajax更新结果容器后，都会调用此函数。我在Home控制器中也犯了一个小错误，因为我插入了一个错误的视图模型类。在所有变化之后，它看起来像这样; 家庭控制器代码：
public class HomeController : Controller
{
[HttpGet]
public ActionResult Index()
{
IndexVM dataVM = new IndexVM();
GetControlsDataSource(dataVM.Orders);
return View(dataVM);
}
private static void GetControlsDataSource(OrdersVM dataVM)
{
List<SelectListItem> typeControlDataSource = new List<SelectListItem>();
foreach (var en in Enum.GetValues(typeof(TypeEnum)))
{
SelectListItem item = new SelectListItem();
item.Text = en.ToString();
item.Value = ((int)en).ToString();
typeControlDataSource.Add(item);
}
dataVM.TypeControlDataSource = typeControlDataSource;
}
[HttpPost]
public ActionResult Pay(OrdersVM dataVM)
{
GetControlsDataSource(dataVM);
if (ModelState.IsValid)
{
dataVM.Info = "Info bla bla bla";
return PartialView("~/Views/Home/_Orders.cshtml", dataVM);
}
else
{
return View(dataVM);
}
}
}
索引视图：
@model WebApplication16.ViewModels.Home.IndexVM
@{
ViewBag.Title = "Index";
}
@Html.Partial("~/Views/Home/_Orders.cshtml", Model.Orders)
<div id="orders-container">
<img id="Type_I" src="~/App_Images/Type_I.png" class="img-responsive hidden" />
<img id="Type_II" src="~/App_Images/Type_II.png" class="img-responsive hidden" />
<img id="Type_III" src="~/App_Images/Type_III.png" class="img-responsive hidden" />
</div>
@section scripts{
<script src="~/Scripts/jquery.validate.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.js"></script>
<script src="~/Scripts/jquery.unobtrusive-ajax.js"></script>
<script>
function imageOnChangeEvent() {
$("#ajax-form").submit();
}
function OnCompleteAjaxForm() {
$('#order-current > img').remove();
var currentOrder = "#Type_" + $("#Type").find('option:selected').text();
var $img = $(currentOrder).clone();
$img.removeClass("hidden");
$("#order-current").append($img);
}
</script>
}
_订单部分查看代码：
@model WebApplication16.ViewModels.Home.OrdersVM
<div id="result">
@using (Ajax.BeginForm("Pay", "Home", new AjaxOptions
{
InsertionMode = InsertionMode.Replace,
UpdateTargetId = "result",
OnComplete = "OnCompleteAjaxForm()"
}, new { id = "ajax-form" }))
{
<div id="order-current">
</div>
<div>
@Html.TextBoxFor(x => x.Name, new { @class = "form-control", style = "margin-top:10px;", id = "Name" })
@Html.ValidationMessageFor(x => x.Name)
</div>
<div>
@Html.DropDownListFor(x => x.Type, Model.TypeControlDataSource, new { @class = "form-control", style = "margin-top:10px;", id = "Type", onchange = "imageOnChangeEvent()" })
@Html.ValidationMessageFor(x => x.Type)
</div>
<div>
<p>@Model.Info</p>
</div>
<button type="submit" class="btn btn-primary" id="button_ok" name="ok"> OK</button>
}
</div>