datagrid加载完成后查询框被重新加载

<div id="crud_datagrid_toolbar">
  	<div class="query-arae">
	  	<form id="query_form" method="post" novalidate style="display:inline-block">
	    	<div class="fast-query-condition">
	    	 	 <label>会议日期:</label>
	             <input name="confDate" class="easyui-datebox" editable="false" value="2018-03-27" style="width:120px;">
	             <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-tip"  style="width:60px;height:25px;" onclick="javascript:$('#query_form').form('load',{confDate:'2018-03-27'});">重置</a>
	        	 <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-search"  style="width:60px;height:25px;" onclick="queryCand()">查询</a>
	        </div>
	    </form>
   	</div>
</div>

<table id="crud_datagrid" toolbar="#crud_datagrid_toolbar" style="width:100%;height:500px;" title="会议室预订管理"></table>

	var columns = [[
		{field:'sid',title:'sid',hidden:'true'},
		{field:'confroomCode',title:'confroomCode',hidden:'true'},
		{field:'confroomDetailed',title:'会议室',align:'left',formatter:fontColot},
		{field:'confName',title:'会议名称',width:20,align:'center'},
		{field:'startTime',title:'会议时间',width:30,align:'center',formatter:formatterdate},
		{field:'personUnit',title:'预订单位',width:30,align:'center'},
		{field:'personName',title:'预订人',width:20,align:'center'},
		{field:'phoneString',title:'联系电话',width:20,align:'center'},
		{field:'confRemarks',title:'备注信息',width:30,align:'center'},
		{field:'caozuo',title:'操作',width:20,align:'center', formatter:formtButton},
	]];
	function tables(){
		$('#crud_datagrid').datagrid({
			url:"${contextPath}/system/confroomplan/list",
			type:"post",
			columns:columns,
			fit:true,
			pagination:true,
			rownumbers:true,
			fitColumns:true,
			singleSelect:true,
			queryParams:{confDate:'${newDate!}'},
			iconCls:'icon-search',
			pageNumber:1,
			onLoadSuccess:function(){
	      		$('#crud_datagrid').datagrid("autoMergeCells", ['confroomDetailed']);
	      	}
		});
	}
	
	function fontColot(value, row, index) {
       var res = '';
	   res = '<button class="easyui-linkbutton" iconCls="icon-add" plain="true" onclick="create('+index+')" >预订</button>' + value;
       $.parser.parse();
	   return res;
	}