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[英]How can I pass DropdownList Selected value with JavaScript to Controller in Asp.net MVC 4?
[英]How can Make a searchable DropDownList in asp.net mvc
我正在做一个 asp.net mvc 项目,我有如下操作:
public ActionResult RegisterCustomer()
{
ViewBagInput();
ViewBag.ProvinceId = new SelectList(db.Province, "ID", "Title");
if (User.Identity.Name != null)
{
var user = db.Users.SingleOrDefault(u => u.Username == User.Identity.Name);
Role.RoleTitle = user.Roles.RoleTitle;
DataLayer.ViewModels.User.FullName = user.FirstName + " " + user.LastName;
}
return View();
}
此操作返回以下视图并将“ViewBag.ProvinceId”发送到此视图(此视图包将省 ID 列表和 ProvinceTitle 发送到此视图,以便在省的 DropDownList 中显示此下拉列表的 Id 为“ProvinceId”):
@using (Ajax.BeginForm("RegisterCustomer", "Customer", FormMethod.Post, new AjaxOptions()
{
OnSuccess = "success",
UpdateTargetId = "listUsers"
},
new { @Id = "theform" }))
{
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
<div class="form-group has-feedback">
@Html.EditorFor(model => model.identificationNo, new { htmlAttributes = new { @class = "form-control", placeholder = Html.DisplayNameFor(x => x.identificationNo) } })
@Html.ValidationMessageFor(model => model.identificationNo, "", new { @class = "text-danger" })
</div>
<div class="form-group has-feedback">
@Html.EditorFor(model => model.FirstName, new { htmlAttributes = new { @class = "form-control", placeholder = Html.DisplayNameFor(x => x.FirstName) } })
@Html.ValidationMessageFor(model => model.FirstName, "", new { @class = "text-danger" })
</div>
<div class="form-group has-feedback">
@Html.EditorFor(model => model.LastName, new { htmlAttributes = new { @class = "form-control", placeholder = Html.DisplayNameFor(x => x.LastName) } })
@Html.ValidationMessageFor(model => model.LastName, "", new { @class = "text-danger" })
</div>
<div class="form-group">
@Html.DropDownList("ProvinceId", null, "- choose a province- ", htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.ProvinceId, "", new { @class = "text-danger" })
</div>
<div class="form-group has-feedback" id="divcities">
@Html.DropDownListFor(model => model.CityId, Enumerable.Empty<SelectListItem>(), "- choose a city -", new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.CityId)
</div>
}
我在这个视图中有以下 jquery :
@section Scripts{
<script type="text/javascript">
$(function() {
$("#ProvinceId").change(function() {
debugger;
$.ajax({
url: "/Customer/GetCities",
data: { stateid: $("#ProvinceId").find(":selected").val() },
type: "Post",
dataType: "Html",
success: function(result) {
$("#divcities").html(result);
},
error: function() {
alert("error!");
}
});
});
});
</script>
此 jquery 调用以下操作:
public ActionResult GetCities(int stateid)
{
ViewBag.CityId = new SelectList(db.City.Where(p => p.ProvinceID == stateid), "ID", "Title");
return PartialView("CityPartialViewForCustomer");
}
此操作返回以下部分视图:
@model DataLayer.ViewModels.CustomerViewModel
<div class="control">
@Html.DropDownList("CityId", null, "- Choose a City ... -", new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.CityId)
</div>
我的第一个问题是这些占位符不允许我输入这个 DropDownList 和 DropDownListFor,我该如何解决这个问题? 第二个问题也是最重要的问题是 DropDownList 和 DropDownListFor 不可搜索。我该如何解决?
看看 Select2,它是 jQuery,并为您提供开箱即用的搜索功能: https : //select2.org/data-sources/ajax
我为此添加了两种方法,您可以选择其中任何一种:
1.检查下面选择的jQuery插件。 它更有用,用户友好,并且具有各种漂亮的 UI 结构。
它具有您正在寻找的许多功能。 请通过以下链接了解更多详情
http://harvesthq.github.io/chosen/
2.其他选项是 Select2,它是 jQuery,它将为您提供触手可及的外观和感觉:
干杯!!
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