Mysql 请选择“因为这是脚本中文本值中的内容。我已将您编辑的内容回滚到原始内容，因为这是我的答案所基于的。您不能完全更改问题，使所有人的答案都完全无效。您的原始代码因我的答案中的原因而不起作用（由于脚本不在$（document.ready（） public cla

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请选择“因为这是脚本中文本值中的内容。我已将您编辑的内容回滚到原始内容，因为这是我的答案所基于的。您不能完全更改问题，使所有人的答案都完全无效。您的原始代码因我的答案中的原因而不起作用（由于脚本不在

$（document.ready（）

public class DistrictSchoolListViewModel
{
    public SelectList Districts { get; set; }
    public SelectList Schools { get; set; }
    public string SelectedSchool { get; set; }
    public string SelectedDistrict { get; set; }
    [Required(ErrorMessage = "This code is required")]
    public string DistrictCode { get; set; }
}

public ActionResult SchoolDistrictInformation()
{
    var viewModel = new DistrictSchoolListViewModel()
    {
        Districts = new SelectList(db.Districts.ToList(), "leaID", "name"),
        Schools = new SelectList(db.Schools.ToList(), "schoolID", "name")
    };
    return View(viewModel);
}

[HttpPost]
public ActionResult GetSchools(DistrictSchoolListViewModel model)
{
    var selectedDistrict = model.SelectedDistrict;
    var schools = findSchools(selectedDistrict);
    IEnumerable<SelectListItem> filteredSchools = 
    schools.Select(m => new SelectListItem { Text = m.name, Value = m.schoolID.ToString() });
    return PartialView("SchoolDistrictInformation", filteredSchools);
}

    internal IQueryable<School> findSchools(string district)
    {
        var query = from School in db.Schools
                    where School.leaID.Equals(district)
                    select School;
        return query;
    }

@model Staff_Form.Models.DistrictSchoolListViewModel 

<h2>Select District and School from list</h2>

<script type="text/javascript" src="/scripts/jquery-1.4.4.js"></script>
<script type="text/javascript">
$('#SelectedDistrict').on('change', function () {

    $.ajax({
        type: "POST",
        url: 'Controller/GetSchools',
        data: $(this).val(),
        success: function (response) {
            $('#SelectedSchool').html(response);
        }
    });

});

</script>

<div>
    <form action="@Url.Action("StaffInformation", "Staff")" method="get">
        District: @Html.DropDownListFor(m => m.SelectedDistrict, Model.Districts, "----Select----")
        Security Code: @Html.TextBoxFor(m => m.DistrictCode) <br />
        School: @Html.DropDownListFor(m => m.SelectedSchool, Model.Schools, "----Select----")
        <input type="submit" value="Submit" />
    </form>
</div>

@model System.Collections.Generic.IEnumerable<System.Web.Mvc.SelectListItem>
@{ Layout = null;}

@foreach (var school in Model)
{
    <option value="@school.Value">@school.Text</option>
}

$('#SelectedDistrict').on('change', function () {
    $.ajax({
        type: "POST",
        url: 'Controller/GetSchools',
        data: { SelectedDistrict: $(this).val() },
        success: function (response) {
            $('#SelectedSchool').html(response);
        }
    });
});