下拉框的添加，移除，選項的觸發。。。。

        function SelectLineList() {

            var str = window.showModalDialog("../../ModalDialog/Sys_BusLineList.aspx", "", "dialogWidth:650px;dialogHeight:400px");//接收值
            if (str !== undefined) {
                 //移除下拉框的子項
                   $("#ctl00_ContentPlaceHolder1_DDStation").find("option").each(function() {
                    $(this).remove();
                });
                var len = $("select[@name='#ctl00$ContentPlaceHolder1$DDStation'] option").length;
                var arr = str.replace('^*#', '\'').split('|');
                if (arr.length > 0) {
                    var data = "type=LineList&UpLine=" + arr[2];
                    var result = $.ajax({ url: "../../Common/ShareChange.aspx",
                        type: "POST",
                        data: data,
                        async: false
                    }).responseText;
                    var myOptions = result.split(',');
                     //給下拉框添加子項
                      for (var i = 0; i < myOptions.length; i++) {
                        var ValueText = myOptions[i].split(':');
                        $('#ctl00_ContentPlaceHolder1_DDStation').append($('<option></option>').val(ValueText[0]).html(ValueText[1]));
                    }
                   //選擇某個子項時觸發
                    $("#ctl00_ContentPlaceHolder1_DDStation").change(function() {
                        $("#ctl00_ContentPlaceHolder1_HDStatoinID").val($(this).val());
                    });

                    $("#ctl00_ContentPlaceHolder1_txtBusLine").val(arr[1]); //公交名稱
                    $("#ctl00_ContentPlaceHolder1_HDLineID2").val(arr[0]); //線路ID
                    $("#ctl00_ContentPlaceHolder1_txtBusStation").val(arr[3]); //整個線路
                }

            }


        }