jquery 异步获取数据 实例

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前台：

 function ListNoUseCode() {//type: $('#<%=ArchiveTypeList.ClientID %>').val()
            $.get("GetCodeHander.ashx", { get: "list", type: $('#<%=ArchiveTypeList.ClientID %>').val(), year: $('#<%=YearList.ClientID %>').val(), mid: $('#<%=DocTypeNameList.ClientID %>').val(), userid: "<%=CurrentUser.UserId.ToString() %>", refresh: Math.random() },
              function(data) {
                  //alert("Data Loaded: " + data);
                  $("#DropDownMenu").empty();
                  var strlist = data.split(',');
                  for (var i = 0; i < strlist.length; i++) {
                      if (data == "") {
                          $("<li class='dorpDownA'>无断号发文</li>").appendTo("#DropDownMenu").click(function() {
                              window['DownDisDiv'].toggleDisplay($("#DropDownMenu").get(0), "none");
                          });
                      }
                      else {
                          var str = strlist[i].split("|");
                          var title = str;
                          var strClass = "dorpDownA";
                          if (str[1] != undefined) {
                              title = str[1];
                              strClass = "dorpDownB";
                          }
                          var no = (1000 + parseInt(str[0], 10)).toString().substr(1, 3);
                          $("<li title='" + title + "' value='" + no + "' class='" + strClass + "'>文号：" + no + "</li>").appendTo("#DropDownMenu").click(function() {
                              var v = (1000 + parseInt($(this).attr('value'), 10)).toString().substr(1, 3);
                              $("#<%=TextBoxArchivesCode.ClientID %>").val(v);
                              window['DownDisDiv'].toggleDisplay($("#DropDownMenu").get(0), "none");
                          }).mouseover(function() {
                              $(this).addClass('Codehover');
                          }).mouseout(function() {
                              $(this).removeClass('Codehover');
                          });
                      }
                  }
                  window['DownDisDiv'].setDiv($("#<%=TextBoxArchivesCode.ClientID %>").get(0), $("#DropDownMenu").get(0));
                  //window['DownDisDiv'].toggleDisplay($("#DropDownMenu").get(0), "");
              });
        }

GetCodeHander.ashx 代码：

 public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";

        #region 清除缓存
        context.Response.Expires = 0;
        context.Response.Cache.SetNoStore();
        context.Response.AppendHeader("Pragma", "no-cache");
        #endregion

        //请求类型
        string appid = context.Request.Params["appid"] != null ? context.Request.Params["appid"].ToString() : "";
        string rtype = context.Request.Params["get"] != null ? context.Request.Params["get"].ToString() : "";
        string atype = context.Request.Params["type"] != null ? context.Request.Params["type"].ToString() : "";
        string year = context.Request.Params["year"] != null ? context.Request.Params["year"].ToString() : "";
        string mid = context.Request.Params["mid"] != null ? context.Request.Params["mid"].ToString() : "";
        string userid = context.Request.Params["userid"] != null ? context.Request.Params["userid"].ToString() : "";
        string systemcode = context.Request.Params["systemcode"] != null ? context.Request.Params["systemcode"].ToString() : "";
        switch (rtype)
        {
            case "max":
                context.Response.Write(sendCode.GetMaxCodeByType_Year(appid, atype, Convert.ToInt16(year), systemcode, userid));
                break;
            case "list":
                ReservationNumber service = new ReservationNumber();
                DataTable dt = service.GetAllNumber("fwxt", atype, year, userid);
                context.Response.Write(string.Join(",", sendCode.GetCutCodeByType_Year(atype, Convert.ToInt16(year), mid, dt).ToArray()));
                break;
            case "title":
                context.Response.Write(sendCode.GetCaptionTitle(atype) + "|" + sendCode.GetForWordTitle(atype)+"|" + sendCode.GetCaptionUnit(atype));
                break;
            default:
                context.Response.Write("param error");
                break;
        }
    }