文本框文本自动补全效果示例分享

(function ($) {
    $.Completion = function (setting) {
        var opts = $.extend({}, $.Completion.DefaultSetting, setting);
        //宽度
        var Completion_Width = null;
        //高度
        var Completion_Height = null;
        //数据源(ashx)访问路径
        var Completion_Data_Url = null;
        //对象
        var Completion_Obj = null;
        var Completion_Obj_Show = null;
        //对象距离左边距
        var Completion_Obj_MarginLeft = null;
        //对象距离上边距
        var Completion_Obj_MarginTop = null;
        //对象高度
        var Completion_Obj_Height = null;
        //分类
        var Completion_Count = null;
        //
        var Completion_Type_obj = null;
        //内容
        var Completion_Value = null;
        //类型
        var Completion_Type = null;
        //是否传入类型
        var Completion_Bool = false;
        //计数
        var Completion_N = 0;
        //回车回调
        var Completion_ClickCall = null;
        //加载
        function Completion_Loading() {
            //初始化
            Init();
            //绑定事件
            Completion_Obj_AddEvent();
        }
        //初始化
        function Init() {
            Completion_Obj_Show = opts.Completion_Obj_Show;
            //获取对象
            Completion_Obj = opts.Completion_Obj;
            //获取对象宽度
            Completion_Width = Completion_Obj.width();
            //获取层显示高度
            Completion_Height = opts.Completion_Height;
            //获取访问数据库URL
            Completion_Data_Url = opts.Completion_Data_Url;
            //每次查询多少条记录
            Completion_Count = opts.Completion_Count;
            //获取对象高度
            Completion_Obj_Height = Completion_Obj.height();
            //获取左边距
            Completion_Obj_MarginLeft = Completion_Obj.offset().left;
            //获取上边距
            Completion_Obj_MarginTop = parseInt(Completion_Obj.offset().top) + parseInt(Completion_Obj_Height);
            Completion_Type_obj = opts.Completion_Type_obj;
            Completion_Bool = opts.Completion_Bool;
            Completion_ClickCall = opts.Completion_ClickCall;
        }
        //给对象添加事件
        function Completion_Obj_AddEvent() {
            Completion_Obj.keyup(function (event) {
                switch (event.keyCode) {
                    case 38:
                        break;
                    case 40:
                        break;
                    case 13:
                        Completion_ClickCall();
                        break;
                    default:
                        //按键事件 延迟操作

                        Cimpletion_Bind();
                        break;
                }

            });
            Completion_Obj.keydown(function (event) {
                switch (event.keyCode) {
                    case 13:
                        break;
                    case 38:
                        if (Completion_N == 0) {