为什么jsp显示不出来查询的内容？代码如下
java

 	public String getTaskQuery() throws Exception{

		

		listMCode = getPrpMcodeNameByType("RiskType");

		List listMap = new ArrayList();

		for (PrpMcode domain : listMCode) {

			Map dateMap = new HashMap();

			dateMap.put("riskCode",domain.getId().getCodeCode());

			dateMap.put("riskName",domain.getCodeCName());

			listMap.add(dateMap); 			

		}

		JSONObject jsonObject = new JSONObject();

		jsonObject.put("data", JSONArray.fromObject(listMap));//封装到JSON

	//	System.out.println(JSONArray.fromObject(listMap)+"####");

		renderHtml(jsonObject.toString());//

		return NONE;

	}

function riskQuery(){

	

  	var url = contextRootPath + '/statements/getTaskReassignQuery.do?';



  	url = handlerParamUrl(url);

  	jQuery.post(url,callback,'json');

  	function callback(obj){

  		  $("#sel").show();

  		  $("#sel").html('');

	            var length = obj.data.length;

	            var innerHtml = "";

               // alert(length);

                //alert(checkIsNull(obj.data[1].riskCode));

                //alert(checkIsNull(obj.data[1].riskName));

                

	            for(var i=0;i<length;i++){

	            	

	            	innerHtml+="<option value='checkIsNull(obj.data[i].riskCode)'>"+checkIsNull(obj.data[i].riskName)+"</option>";	          

	            }

	            $("#sel").append(innerHtml);

	        

		}   

}

jsp

	             <select id="riskCode" style="height:26px; width:80%; margin-left:8px;" onclick="riskQuery();">

	                  <option value="" selected="selected"></option>

	                  <div id="sel"></div>

	             </select>