easyUi jqgrid search

function getGrid() {
            var selectedRowIndex = 0;
            $("#tableDiv").empty();
            $("#tableDiv").append("<table id='gridTable'></table><div id='gridPager'></div>");
            
            var $gridTable = $('#gridTable');
            $gridTable.jqGrid({
                url:basePath+"indexexplain/indexexplain/index_explain_data.action",
                postData:{},
                datatype : "json",
                height: $(document).height()-200,
                autowidth: true,
                colModel : [ //jqGrid每一列的配置信息。包括名字，索引，宽度,对齐方式.....
                                {label : '指标标识',name : 'INDEX_EXPLAIN_ID',index : 'INDEX_EXPLAIN_ID', hidden: true },
                                {label : '公交指标名称',name : 'INDEX_NAME',index : 'INDEX_NAME',width : 200,align : 'center',sortable:false},
                                {label : '公交指标定义',name : 'INDEX_DEFINE',index : 'INDEX_DEFINE',width : 270,align : 'center',sortable:false},
                                {label : '公交指标单位',name : 'INDEX_UNIT',index : 'INDEX_UNIT',width : 200,align : 'center',sortable:false},
                                {label : '公交指标计算公式',name : 'INDEX_FORMULA',index : 'INDEX_FORMULA',width : 200,align : 'center',sortable:false},
                                {label : '年度计算公式',name : 'INDEX_YEARFORMULA',index : 'INDEX_YEARFORMULA',width : 200,align : 'center',sortable:false},
                                {label : '月度计算公式',name : 'INDEX_MONTHFORMULA',index : 'INDEX_MONTHFORMULA',width : 200,align : 'center',sortable:false}
        
                           ],
                viewrecords: true,
                rowNum: 10,
                rowList: [5, 10, 20],
                pager: "#gridPager",
                sortname: 'age',
                sortorder: 'asc',
                rownumbers: true,
                shrinkToFit: false,
                gridview: true,
                async: false,
                multiselect: false,
                onSelectRow : function() {
                    selectedRowIndex = $("#" + this.id).getGridParam('selrow');
                },
                gridComplete : function() {
                    $("#" + this.id).setSelection(selectedRowIndex, false);
                    rowData = $gridTable.jqGrid("getRowData");
                    var ids = $gridTable.getDataIDs();
                    jQuery(ids).each(function(index, id) {
                        var data = $gridTable.getRowData(id);
                        if (data.flag == "100") {
                            $('#' + id).find("td").css("color", "YellowGreen");
                        }
                    });
                }
            });
            
             //查询条件
            $("#search_td1 .dropdown-menu li").click(function () {
                var text = $(this).find('a').html();
                var value = $(this).find('a').attr('data-value');
                $("#search_td1 .dropdown-text").html(text).attr('data-value', value);
            });
            $("#btn_search").click(function () {
                reloadGrid();
            });
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$("#btn_search").click(function () {
var indexName = $("#search_indexName").val();
indexName = encodeURI($.trim(indexName));
var indexCode = $("#search_td1").find('a').attr('data-value');
if(!indexCode){
indexCode = "";
}
//alert(indexCode);
var postJson = {indexName:indexName,indexCode:indexCode};

//传入查询条件参数
$gridTable.jqGrid("setGridParam",{postData:postJson});

//每次提出新的查询都转到第一页
$gridTable.jqGrid("setGridParam",{page:1});
//提交post并刷新表格
$gridTable.jqGrid("setGridParam",{url:url}).trigger("reloadGrid");


});

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            //查询回车
            $('#search_indexName').bind('keypress', function (event) {
                if (event.keyCode == "13") {
                    $('#btn_search').trigger("click");
                }
            });
        }
        
        
        
        function reloadGrid() {
            var $gridTable = $("#gridTable");
            var url = basePath + 'indexexplain/indexexplain/indexexplain_data.action';
            var indexName = $("#search_indexName").val();//获取comboboxde的code值
            indexName = encodeURI($.trim(indexName));
            var indexCode = $("#search_td1").find('a').attr('data-value');
             if(!indexCode){
                 indexCode = "";
             }
             var postJson = {indexName:indexName,indexCode:indexCode};  
               
             //传入查询条件参数  
             $gridTable.jqGrid("setGridParam",{postData:postJson});   
             
             //每次提出新的查询都转到第一页  
             $gridTable.jqGrid("setGridParam",{page:1});  
             //提交post并刷新表格  
             $gridTable.jqGrid("setGridParam",{url:url}).trigger("reloadGrid"); 
        
        }

<div class="title-search">
                  <table>
                    <tr>
                        <td id="search_td1">
                            <div id="search_div" class="btn-group">
                                <a class="btn btn-default dropdown-text" data-toggle="dropdown">查询条件</a>
                                <a class="btn btn-default dropdown-toggle" data-toggle="dropdown"><span class="caret" style="margin-top: 5px;"></span></a>
                                   <ul class="dropdown-menu">
                                           <li><a data-value="indexName">公交指标名称</a></li>
                                           //<li><a data-value="indexSystemFlag">公交指标标识</a></li>
                                       
                                   </ul>
                           
                            </div>
                        </td>
                        <td   id="search_td2" style="padding-left: 5px;">
                            <input id="search_indexName" type="text" class="form-control" placeholder="请输入查询条件" style="width: 150px;margin-top: -4px;" />
                        </td>
                        <td id="search_td3" style="padding-left: 5px;">
                            <a id="btn_search" class="btn btn-primary"><i class="fa fa-search"></i>&nbsp;查询</a>
                        </td>
                    </tr>
                  </table>
               </div>