我正在尝试使用修改后的索引视图创建一个设置页面。目标是用户获得所有设置显示,并可以在一个视图中更改所有设置,并使用一个按钮保存所有设置。设置应该使用Ajax更新。
我当前的方法:
视图:
<script language="javascript">
$(function() {
$('#editSettings').submit(function () {
if ($(this).valid()) {
$.ajax({
url: this.action,
type: this.method,
data: $(this).serialize(),
success: function (result)
{
alert(result);
}
});
}
return false;
});
});
</script>
[ ... ]
@using (Ajax.BeginForm("Edit", "Settings", new AjaxOptions {UpdateTargetId = "result"}, new { @class = "form-horizontal", @id = "editSettings" } ))
{
foreach (Setting item in ViewBag.Settings)
{
@Html.Partial("_SingleSetting", item)
}
<input type="submit" value="modify" />
}
局部视图加载设置:
<div class="control-group">
<label class="control-label">@settingName</label>
<div class="controls">
@Html.EditorFor(model => model.Value)
<span class="help-inline">@settingDescription</span>
</div>
</div>
模型:
[Table("Settings")]
public class Setting
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int SettingId { get; set; }
public string Name { get; set; }
[Required(AllowEmptyStrings = true)]
[DisplayFormat(ConvertEmptyStringToNull = false)]
public string Value { get; set; }
}
我正在使用ViewBag.Settings = _db.Settings.ToList();
jQuery将Data解析为以下方法:
[HttpPost]
public ActionResult Edit(IList<Setting> setting)
{
Console.WriteLine(setting.Count);
return Content(""); // Currently for testing purposes only. Breakpoint is set to setting.Count
}
Count
抛出错误,因为设置是null
。我不确定如何解决这个问题。
关于SO的主题已经涵盖了在没有Ajax的情况下更新Collection。但是我不明白。
谢谢你的帮助。
您正在使用Ajax.BeginForm
并再次使用jQuery ajax表单。这没有必要。但是代码的真正问题是部分中输入字段的名称。您没有尊重默认模型绑定器用于绑定到列表的naming convention
。
让我们举一个完整的例子(为了简单起见,去掉所有的噪音,比如实体框架):
模型:
public class Setting
{
public int SettingId { get; set; }
public string Name { get; set; }
public string Value { get; set; }
}
控制器:
public class SettingsController : Controller
{
public ActionResult Index()
{
// No idea why you are using ViewBag instead of view model
// but I am really sick of repeating this so will leave it just that way
ViewBag.Settings = Enumerable.Range(1, 5).Select(x => new Setting
{
SettingId = x,
Name = "setting " + x,
Value = "value " + x
}).ToList();
return View();
}
[HttpPost]
public ActionResult Edit(IList<Setting> setting)
{
// Currently for testing purposes only. Breakpoint is set to setting.Count
return Content(setting.Count.ToString());
}
}
View (~/Views/Settings/Index.cshtml
):
@using (Html.BeginForm("Edit", "Settings", FormMethod.Post, new { @class = "form-horizontal", id = "editSettings" }))
{
foreach (Setting item in ViewBag.Settings)
{
@Html.Partial("_SingleSetting", item)
}
<input type="submit" value="modify" />
}
@section scripts {
<script type="text/javascript">
$('#editSettings').submit(function () {
if ($(this).valid()) {
$.ajax({
url: this.action,
type: this.method,
data: $(this).serialize(),
success: function (result) {
alert(result);
}
});
}
return false;
});
</script>
}
设置部分(~/Views/Settings/_SingleSetting.cshtml
):
@model Setting
@{
var index = Guid.NewGuid().ToString();
ViewData.TemplateInfo.HtmlFieldPrefix = "[" + index + "]";
}
<input type="hidden" name="index" value="@index" />
<div class="control-group">
<label class="control-label">@Html.LabelFor(x => x.Name)</label>
<div class="controls">
@Html.EditorFor(model => model.Value)
</div>
</div>
请注意,为了让html helper为您的输入字段生成适当的名称并遵守命名约定,在局部中有必要更改HtmlFieldPrefix。
好了,现在让我们剪掉ViewCrap并正确地做事情(即当然使用视图模型)。
与往常一样,我们从编写视图模型开始:
public class MyViewModel
{
public IList<Setting> Settings { get; set; }
}
然后我们调整控制器:
public class SettingsController : Controller
{
public ActionResult Index()
{
var model = new MyViewModel();
// you will probably wanna call your database here to
// retrieve those values, but for the purpose of my example that
// should be fine
model.Settings = Enumerable.Range(1, 5).Select(x => new Setting
{
SettingId = x,
Name = "setting " + x,
Value = "value " + x
}).ToList();
return View(model);
}
[HttpPost]
public ActionResult Edit(IList<Setting> setting)
{
// Currently for testing purposes only. Breakpoint is set to setting.Count
return Content(setting.Count.ToString());
}
}
View (~/Views/Settings/Index.cshtml
):
@model MyViewModel
@using (Html.BeginForm("Edit", "Settings", FormMethod.Post, new { @class = "form-horizontal", id = "editSettings" }))
{
@Html.EditorFor(x => x.Settings)
<input type="submit" value="modify" />
}
@section scripts {
<script type="text/javascript">
$('#editSettings').submit(function () {
if ($(this).valid()) {
$.ajax({
url: this.action,
type: this.method,
data: $(this).serialize(),
success: function (result) {
alert(result);
}
});
}
return false;
});
</script>
}
设置模型的编辑器模板(~/Views/Settings/EditorTemplates/Settings.cshtml
):
@model Setting
<div class="control-group">
<label class="control-label">@Html.LabelFor(x => x.Name)</label>
<div class="controls">
@Html.EditorFor(model => model.Value)
</div>
</div>
现在按约定工作。不需要编写任何foreach循环。Index视图中的@Html.EditorFor(x => x.Settings)
调用分析视图模型的Settings属性,并检测它是某个其他模型的集合(在本例中为Setting
)。因此,它将开始循环遍历该集合并搜索相应的编辑器模板(~/Views/Settings/EditorTemplates/Setting.cshtml
),该模板将自动为该集合的每个元素呈现。你甚至不需要在视图中写任何循环。除了简化代码之外,现在编辑器模板中的Html.EditorFor(x => x.Value)
将为输入字段生成适当的名称。