如何将重点放在下拉列表上

Question

我有一个下拉列表，其中包含“全部，活动和不活动”。当选择不活动时，它们显示表中的所有不活动用户以及与活动用户相同的用户。但是，我希望光标焦点停留在下拉列表上，但焦点始终跳到最后一个单元格列标题。我尝试过

$("#<%= ddlShowStaffStatus.ClientId %>").focus(); 

，当我注释掉loadStaffGroup()（列出所有非活动用户和活动用户）时，它会起作用。无论如何，我的光标焦点停留在dropdownlist上，并且同时使用loadstaffgroup（）。请参见下面的代码。谢谢。

$("#ddlShowStaffStatus").on("change", function () {

            loadStaffGroup();

        });
 function loadStaffGroup() {
        var hdGroupUsersList = '#<%=hdGroupUsersList.ClientID %>';
        var tblTemp = '#tblManageGroup';
        var objGrp = new objForm();
        var initObj = {};
        initObj.sda = objGrp.sda;
        initObj.programId = objGrp.programId;
        initObj.programCode = objGrp.programCode;
        initObj.groupId = objGrp.groupId;
        initObj.inactiveUser = objGrp.inactiveUser;
        initObj.locationValue = objGrp.locationValue;
        initObj.locationType = objGrp.locationType;
        var url = 'CaseStaffAssign.aspx/GetStaffCaseAssignmentGroup';
        $.ajax({
            beforeSend: function () {
                $('.loader').show();
            },
            complete: function () {
                $('.loader').hide();
            },
            error: function (msg) {
                alert("loadStaffCaseAssignmentGroup - error:" + JSON.stringify(msg));
            },
            url: url,
            type: "POST",
            async: true,
            data: JSON.stringify(initObj),
            processData: false,
            contentType: "application/json; charset=utf-8",
            success: function (data) {
                var results = data.d;
                if (results.length > 0) {
                    showHideDiv(true);
                    var tblTempBody = $(tblTemp + " tbody");
                    tblTempBody.empty();
                    for (var i = 0; i < results.length; i++) {
                        var oUsername = results[i].StaffLoginname;
                        var oFirstName = results[i].FirstName;
                        var oLastName = results[i].LastName;
                        var oAssign = results[i].col_Assign;
                        var oGroupLead = results[i].col_GroupLead;
                        var row = "<tr>" +
                            "<td>" + oUsername + "</td>" +
                            "<td>" + oFirstName + "</td>" +
                            "<td>" + oLastName + "</td>" +
                            "<td style='text-align: center;'>" + oAssign + "</td>" +
                            "<td style='text-align: center;'>" + oGroupLead + "</td>" +
                            "</tr>";
                        tblTempBody.append(row);
                        var rows = results.length - 1
                        if (i == rows) {
                            var ret = results[i].GroupUsersList;
                            $(hdGroupUsersList).val(ret);
                        }                            
                    }
                    //alert('from loadStaffGroup() ' + $(hdGroupUsersList).val());
                    $(tblTemp).trigger('update');
                }
                else {
                    showHideDiv(false);
                }
            },
        });
    }


Protected Sub InitialLoad()

    With ddlShowStaffStatus
        .DataSource = CaseAssignmentManager.GetLookUpItemsWiaCommon("staff", "active_staff", AppUser.Lang, "0")
        .DataTextField = "Description"
        .DataValueField = "Value"
        .DataBind()
        .SelectedValue = "2"

    End With
    GetInfoByGroupID()
    GetCaseAssignedGoupInfo()
    GetCaseAssignedOtherGroupMembers()
    ddlShowStaffStatus.Focus()
End Sub

焦点跳到表格的最后一列标题，但我需要它留在下拉列表中