小数据二级联动-封装成一个二级联动部分视图

@using op.webui.areas.stock.models

@*约定如下：
    调用 setviewbag_rooms 方法设置 viewbag.rooms
*@

<div class="form-group">
    <label class="col-sm-3 control-label no-padding-right" for="form-field-1"> 所属库房</label>
    <div class="col-sm-9">
        <select  id="roomid" name="roomid" class="width-40 chosen-select  form-control" data-placeholder="所属库房">
            @foreach (father father in (ienumerable<father>)viewbag.rooms)
            {
                if (father.selected)
                {
                    <option selected="selected" id="[e-mail]" value="@father.id" childs="@father.getoptionsmark()">@father.name</option>
                }
                else
                {
                    <option id="[e-mail]" value="@father.id" childs="@father.getoptionsmark()">@father.name</option>
                }
            }
        </select>
    </div>
</div>
<div class="form-group">
    <label class="col-sm-3 control-label no-padding-right" for="form-field-1"> 楼层</label>
    <div class="col-sm-9">
        <select id="floorid" name="floorid" class="width-40 chosen-select form-control" data-placeholder="楼层"></select>
    </div>
</div>

<script type="text/javascript">
    var room = $("#roomid");
    room.change(function () {
        debugger;
        var roomid = $(this).val();
        loadchild(roomid);
    });
    function loadchild(roomid) {
        if (!roomid) {
            $("#floorid").html("");
            return;
        }
        var childs = $("#option-" + roomid).attr("childs");
        $("#floorid").html(childs);
    }
    loadchild(room.val());
</script>

using system.collections.generic;
using system.text;

namespace op.webui.areas.stock.models
{
    public sealed class father : item
    {
        public ienumerable<child> items { get; set; }

        /// <summary>
        /// 获取下拉选项标记
        /// </summary>
        /// <returns></returns>
        public string getoptionsmark()
        {
            stringbuilder sb = new stringbuilder();
            foreach (var item in items)
            {
                if (item.selected)
                {
                    sb.append("<option selected=\"selected\" value=\"" + item.id + "\">" + item.name + "</option>");
                }
                else
                {
                    sb.append("<option value=\"" + item.id + "\">" + item.name + "</option>");
                }
            }
            return sb.tostring();
        }
    }

    public sealed class child : item
    {
    }

    public abstract class item
    {
        public int id { get; set; }
        public string name { get; set; }
        public bool selected { get; set; }
    }
}

//viewbag 调用示例
//rooms 是 父实体集合 floorscatch 是子实体数据源
// on room.id = floor.roomid
var roomids = rooms.select(m => m.id);
            var floorscatch = _floorservice.value.getfloors(roomids);
            viewbag.rooms = rooms.select(m => new father
            {
                id = m.id,
                name = m.name,
                selected = m.id == selectedroomid,
                items = floorscatch.where(n => n.roomid == m.id && n.isenable == true)
                .select(n => new child { id = n.id, name = n.name, selected = n.id == selectedfloorid })
            });