使用jQuery将项添加到asp.net下拉列表中。以下代码不起作用，我缺少什么？请帮忙。

问题描述

function filterLedgerAccounts() {
                   var AccType = $("#ACCOUNTTYPE").val();
                   switch (AccType) {
                       case "Income": //120*;130*;10*
                           var allLedger = $get("tbblkProcessCreditN_TabPanel1_ddlAllLedgerAccounts");
                           var ddlAccLookUp = $("tbblkProcessCreditN_TabPanel1_ddlAccNo");
                           var incomeCount = 0;
                           for (var i = 0; i < allLedger.length; i++) {
                               if (allLedger.options[i].value.match(120) || allLedger.options[i].value.match(130) || allLedger.options[i].value.match(10)) {
                                   incomeCount++;
                               }
                           }
                           ddlAccLookUp.length = incomeCount;
                           var incomePos = 0;
                          
                           for (var i = 0; i < allLedger.length - 1; i++) {
                               if (allLedger.options[i].value.match(120) || allLedger.options[i].value.match(130) || allLedger.options[i].value.match(10)) {
                                 
                                   $('#tbblkProcessCreditN_TabPanel1_ddlAccNo').append($("<option value=" + allLedger.options[i].value + ">" + allLedger.options[i].text + "</option>"));

                                   incomePos++;
                               }
                           }
                           break;
                       case "Expense": //20*;11*
                           var allLedger = $get("tbblkProcessCreditN_TabPanel1_ddlAllLedgerAccounts");
                           var ddlAccLookUp = $("tbblkProcessCreditN_TabPanel1_ddlAccNo");
                           var expenseCount = 0;
                           for (var i = 0; i < allLedger.length; i++) {
                               if (allLedger.options[i].value.match(20) || allLedger.options[i].value.match(11)) {
                                   expenseCount++;
                               }
                           }
                           ddlAccLookUp.length = expenseCount;
                           var expensePos = 0;
                           for (var i = 0; i < allLedger.length - 1; i++) {
                               if (allLedger.options[i].value.match(20) || allLedger.options[i].value.match(11)) {
                                   $("tbblkProcessCreditN_TabPanel1_ddlAccNo").append("<option value=" + allLedger.options[i].value + ">" + allLedger.options[i].text + "</option>");
                                   expensePos++;
                               }
                           }
                           break;
                       case "Control Accounts":
                           var allLedger = $get("tbblkProcessCreditN_TabPanel1_ddlAllLedgerAccounts");
                           var ddlAccLookUp = $("tbblkProcessCreditN_TabPanel1_ddlAccNo");
                           var controlCount = 0;
                           for (var i = 0; i < allLedger.length; i++) {
                               if (allLedger.options[i].value.match(9999)) {
                                   controlCount++;
                               }
                           }
                           ddlAccLookUp.length = controlCount;
                           var controlPos = 0;
                           for (var i = 0; i < allLedger.length - 1; i++) {
                               if (allLedger.options[i].value.match(9999)) {
                                   $("tbblkProcessCreditN_TabPanel1_ddlAccNo").append("<option value=" + allLedger.options[i].value + ">" + allLedger.options[i].text + "</option>");
                                   controlPos++;
                               }
                           }
                           break;
                   }

               }

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