MVC 4 Razor 使用 Ajax 表单更新 foreach 循环

Question

从哪里开始...我可以在 Internet 上找到类似的东西，但它们似乎与我想做某事的特定方式不相符。我尝试过使用和不使用局部视图，但收效甚微。

简要说明：我有一个带有 Ajax 表单的强类型视图。在表单下方，我有一个重复代码块的 foreach 循环。我需要能够从表单选择（过滤器）更新代码块。

这是我的观点，“FindATeacher.cshtml”，就目前而言（在尝试了许多不同的想法之后）：

@model Teachers.Models.OmniModel
@{
    ViewBag.Title = "FindATeacher";
    Layout = "~/Views/Shared/_Layout.cshtml";

}
<h2>Find a Teacher</h2>
@using (Ajax.BeginForm("FilterTeachers", "Home", new AjaxOptions { HttpMethod = "Post", OnSuccess = "onSuccess" }))
{
    <div id="ContentFilter">
        <div class="filterLabels">
            <p>Search by Name</p>
            <p>Filter By Instrument</p>
            <p>Filter By City</p>
        </div>
        <div class="filterObjects">
            <p>
                <input type="text" id="nameTXT" />
                <button type="submit" id="findButton">find</button>
            </p>
            <p>@Html.DropDownList("InstrumentID", (SelectList)Model.Instruments, "-- Select an Instrument --", new { id = "instrumentDD" })</p>
            <p>@Html.DropDownList("CityID", (SelectList)Model.Cities, "-- Select a City --", new { id = "cityDD" })</p>
        </div>
    </div>
}
<hr />
@foreach (var r in Model.Teachers)
{
    <div id="ContentResults">
        <div id="avatar">
            <img src="i" />
        </div>

        <div id="demographics">
            <h6>@r.Teacher</h6>
            <strong>@r.StudioName</strong>
            <p><a href="#">@r.URL</a></p>
            <p>@r.StreetAddress</p>
            <p>@r.City, @r.AddressStateID @r.Zip</p>
            <p>@r.Phone</p>
            <p>@r.EmailAddress</p>
        </div>
        <div id="studioDetails">
            <p><strong>Instrument(s) Taught</strong></p>
            <p>
                @{
    var instrumentString = r.Instruments.Aggregate("", (a, b) => a + b.Instrument + ", ");
    if (instrumentString.Length != 0)
    {
        instrumentString = instrumentString.Remove(instrumentString.LastIndexOf(","));
    }
                }
                @instrumentString
            </p>
            <br />

            @if (r.Information != "" && r.Information != null)
            {
                <p><strong>Information</strong></p>
                <p>@r.Information</p>
            }
        </div>
    </div>
}

现在这是我的控制器。我在控制器中正确地得到了结果，只是没有更新代码块：

public ActionResult FindATeacher()
        {
            Model.Instruments = new SelectList(TeacherService.GetInstrumentList(0),"InstrumentID","Instrument");
            Model.Cities = new SelectList(TeacherService.GetCityList(),"CityID","City");
            Model.Teachers = TeacherService.GetTeacherList("", 0);
            return View(Model);
        }

        [HttpPost]
        public JsonResult FilterTeachers(String teacherName, String instrumentID, String cityID)
        {
            Model.Teachers = TeacherService.GetTeacherList("John", 0, 0);
            return Json(Model.Teachers);
        }

谢谢。

Answer 1

@VishalVaishya 提出了正确的想法，但有一种更简单的方法，它不涉及自定义 javascript 代码：AjaxOptions 有一个 UpdateTargetId 属性，AJAX 工具包将解释该属性意味着您希望使用发送的结果更新给定目标从控制器返回。

FindATeacher.cshtml：

@using (Ajax.BeginForm("FilterTeachers", "Home", new AjaxOptions { 
    HttpMethod = "Post", UpdateTargetId = "TeacherList" }))
{
    ...
}
<hr />
<div id="TeacherList">
    @Partial("TeacherList", Model.Teachers)
</div>

TeacherList.cshtml

@model IEnumerable<Teacher>
@foreach(var teacher in Model)
{
   ...
}

控制器动作：

    [HttpPost]
    public ActionResult FilterTeachers(String teacherName, String instrumentID, String cityID)
    {
        Model.Teachers = TeacherService.GetTeacherList(teacherName, instrumentID, cityID);
        return PartialView("TeacherList", Model.Teachers);
    }

Answer 2

你可以试试下面的方法：

将您的 foreach 循环分离到另一个局部视图中。 并在过滤器/单击事件上加载您的部分视图，并将过滤后的参数传递给您的控制器操作。

JS 更改事件代码会是这样的：

var teacherName = ''; //get your selected teachername
var instrumentID = ''; //get your selected instrumentid
var cityID = ''; //get your selected city id

var url = '@Url.Action("FilterTeachers", "ControllerName", new { teacherName = "teacher-Name", instrumentID="instrument-ID", cityID="city-ID" })';

url = url.replace("teacher-Name", teacherName).replace("instrument-ID", instrumentID).replace("city-ID", cityID);

$('#result').load(url);