jqGrid分页问题，带详细代码，求人指点！！！！


function queryClick(){
clearJsp();
            var param = "&promActName="+$("#promActName").val()+"&regionId="+$("#regionId").val();
    param += "&pricingPlanName="+$('#pricingPlanName').val()+"&pricingPlanId="+$("#pricingPlanId").val();
    var URL = "<%=path%>/promotionTAction.do?method=queryPromotionActivity"+param;
      jQuery("#promActListTable").jqGrid('setGridParam',{url:URL,page:1,datatype: "json"}).trigger('reloadGrid');
 }
 public ActionForward queryPromotionActivity(ActionMapping mapping,
ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception {
request.setCharacterEncoding("GBK"); List param = new ArrayList();
        String regionId = request.getParameter("regionId");
String promActName = request.getParameter("promActName");
String pricingPlanName = request.getParameter("pricingPlanName");
String pricingPlanId = request.getParameter("pricingPlanId");
String page = request.getParameter("page");

StringBuffer queryBuff = new StringBuffer(); queryBuff.append(" select distinct a.prom_act_id,a.region_id,a.pic_name, (select x.region_name from region_t x where x.ioid_id0 = a.region_id), ");
queryBuff.append(" a.prom_act_name, a.prom_act_desc, a.eff_date, a.exp_date, a.main_flag, ");
queryBuff.append(" '");
queryBuff.append(" <input promActId=\'''||a.prom_act_id||'\'' type=\''button\'' value=\''删 除\'' onclick=\''delPromAct(this)\''>' operation from ");
queryBuff.append(" promotion_activity_t a, promotion_price_t b, pricing_plan_t c where  ");
queryBuff.append(" a.state = '00A' and b.pricing_plan_id = c.pricing_plan_id ");
queryBuff.append(" and a.region_id in(10,?) ");
param.add(regionId);
if (promActName != null && !"".equals(promActName)) {
queryBuff.append(" and a.prom_act_name like '%'||?||'%' ");
param.add(promActName);
} if (pricingPlanId != null && !"".equals(pricingPlanId)) {
queryBuff.append(" and a.prom_act_id = b.prom_act_id ");
queryBuff.append(" and b.pricing_plan_id = ? ");
param.add(pricingPlanId);
} if (pricingPlanName != null && !"".equals(pricingPlanName)) {
queryBuff.append(" and a.prom_act_id = b.prom_act_id ");
queryBuff.append(" and c.pricing_plan_name like '%'||?||'%' ");
param.add(pricingPlanName);
} queryBuff.append(" order by nvl(main_flag, 999) ");
List list = DataBaseAccess.getSidTemplate().queryForList(queryBuff.toString(), param.toArray());
Map returnMap = new HashMap();
returnMap.put("rows", list);
returnMap.put("page", page);
if (list != null && list.size() > 0) {
returnMap.put("records", list.size() + "");
} this.getLog().debug(JsonUtil.getJSONString(returnMap));
this.printResponse(response, "text/json;charset=GBK", JsonUtil.getJSONString(returnMap)); return null;
}
页面上点击第二页第三页没有变化。求指点，在线等。。jqGridjavajsp