Question

 @Html.DropDownList("GroupCode",(IEnumerable<SelectListItem>)ViewBag.GroupCode,"-- Please Select --", new{@id="groupcd"})

DropDownList选择组并将选中的值回发给JSON以获取客户端代码列表并放入另一个DropDownList

$(function() {
    $("#groupcd").change(function () {
        var selectedValue = $("#groupcd").val();
        $.post('@Url.Action("getClientCD", "OutstandingClaim")', { selection: selectedValue }, function (data) {
            $("#clientcd").html(data);

        });
    });
});

Javascript获取所选值并发布到操作

        public JsonResult getClientCD(string selection)
    {
        var data = db.Common_CustMas.Where(c => c.Group == selection)
                .ToList().Select(x => string.Format("{0}--{1}", x.CUSTCODE, x.CUSTNAME));
        ViewBag.ClientCode = data;
        return Json(data, JsonRequestBehavior.AllowGet);
    }

回发到控制器后，查询列表并传回

@Html.DropDownList("ClientCD", (IEnumerable<SelectListItem>) ViewBag.ClientCode, "--Please Select --", new{@id="clientcd"})

查询有效，但没有数据传回ViewBag客户端代码。任何人都知道什么问题以及如何解决这个问题？

Answer 1

你可以这样做

$('#CityID').change(function () {
            var cityid = $(this).val();
            $.ajax({
                url: '@Url.Action("PopulateDistrictsList ","Controller")',
                data: { CityID: cityid },
                datatype: "json",
                success: function (data) {
                   var ddldist = $('#DistrictID');
                    $.each(data, function (val, text) {
                        ddldist.append(
                            $('<option></option>').val(val).html(text)
                        );
                    });

                },
            })
        });

Answer 2

最后用代码

解决了

$(function() {
     $("#groupcd").change(function () {
         var selectedValue = $("#groupcd").val();
         $.getJSON('@Url.Action("getClientCD", "OutstandingClaim")', { selection: selectedValue }, function (result) {
             var ddl = $('#clientcd');
             ddl.empty();
             $(result).each(function () {
                 ddl.append(
                     $('<option/>').html(this.Text)
                 );
             });
         });
     });
});

控制器

public JsonResult getClientCD(string selection)
    {
        var data = (from a in db.Common_CustMas
                                  where a.Group == selection
                                  select new {Text = ( a.CUSTCODE + "-" + a.CUSTNAME)}).Distinct().ToList();
        return Json(data, JsonRequestBehavior.AllowGet);
    }

下拉列表

@Html.DropDownList("GroupCode",(IEnumerable<SelectListItem>)ViewBag.GroupCode,"-- Please Select --", new{@id="groupcd"})

 @Html.DropDownList("ClientCD", new SelectList(Enumerable.Empty<SelectListItem>()),new{@id="clientcd"})

回发JSON将数据传递给ViewBag MVC

2 个答案: