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在easyUI中使用datagrid-detailview.js可快速实现二级折叠列表，示例如下：
注意事项：
原本在谷歌浏览器进行示例测试的，url请求对应的json文件，效果一直显示不出来，换到谷歌和IE是可以正常显示的，
解决方法可参考：http://www.cnblogs.com/shunzdd/p/5585990.html
其中的请求url对应的json文件封装的数据格式如下：
相关属性可参考该博客：https://www.cnblogs.com/cnjava/archive/2013/01/21/2869876.html
附官网demo连接：http://www.jeasyui.net/extension/189.html
{"total":28,"rows":[
{"productid":"FI-SW-01","unitcost":10.00,"status":"P","listprice":16.50,"attr1":"Large","itemid":"EST-1"},
{"productid":"K9-DL-01","unitcost":12.00,"status":"P","listprice":18.50,"attr1":"Spotted Adult Female","itemid":"EST-2"},
{"productid":"RP-SN-01","unitcost":12.00,"status":"P","listprice":18.50,"attr1":"Venomless","itemid":"EST-3"},
{"productid":"RP-LI-02","unitcost":12.00,"status":"P","listprice":18.50,"attr1":"Green Adult","itemid":"EST-5"},
{"productid":"FL-DSH-01","unitcost":12.00,"status":"P","listprice":58.50,"attr1":"Tailless","itemid":"EST-6"},
{"productid":"FL-DSH-01","unitcost":12.00,"status":"P","listprice":23.50,"attr1":"With tail","itemid":"EST-7"},
{"productid":"FL-DLH-02","unitcost":12.00,"status":"P","listprice":93.50,"attr1":"Adult Female","itemid":"EST-8"},
{"productid":"FL-DLH-02","unitcost":12.00,"status":"P","listprice":93.50,"attr1":"Adult Male","itemid":"EST-9"},
{"productid":"RP-SN-01","unitcost":12.00,"status":"P","listprice":18.50,"attr1":"Rattleless","itemid":"EST-4"},
{"productid":"AV-CB-01","unitcost":92.00,"status":"P","listprice":193.50,"attr1":"Adult Male","itemid":"EST-10"}
]}
<html>
<head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>jQuery EasyUI</title>
<link rel="stylesheet" type="text/css" href="easyui.css">
<link rel="stylesheet" type="text/css" href="icon.css">
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="jquery.easyui.min.js"></script>
<script type="text/javascript" src="datagrid-detailview.js"></script>
</head>
<body>
<h2>Expand row in DataGrid to show subgrid</h2>
<div class="demo-info" style="margin-bottom:10px">
<div class="demo-tip icon-tip"> </div>
<div>Click the expand button to expand row and view subgrid.</div>
</div> <div id="dg" style="width:650px;height:250px"></div>
<script type="text/javascript">
$(function(){
$('#dg').datagrid({
view: detailview,
url:'json2.json',
singleSelect:"true" ,
fitColumns:"true",
striped:true,
checkOnSelect:'true',
columns:[[
{field:'itemid',title:'Order ID',width:200},
{field:'productid',title:'Quantity',width:100,align:'right'},
{field:'unitcost',title:'Unit Price',width:100,align:'right'}
]],
detailFormatter:function(index,row){
return '<div style="padding:2px"><table id="ddv-' + index + '"></table></div>';
},
onExpandRow: function(index,row){
$('#ddv-'+index).datagrid({
//url:'./javascript/jquery-easyui-1.5.1/datagrid-detaildata.json?itemid='+row.itemid',
url:'json2detail.json',
fitColumns:true,
singleSelect:true,
rownumbers:true,
loadMsg:'',
height:'auto',
columns:[[
{field:'orderid',title:'Order ID',width:200},
{field:'quantity',title:'Quantity',width:100,align:'right'},
{field:'unitprice',title:'Unit Price',width:100,align:'right'},
{field:'op',title:'操作',width:100,align:'right',formatter:formatOper}
]],
detailFormatter:function(index2,row2){
console.log("----------------");
console.log(index2+"==========="+row2);
return '<div style="padding:2px"><table id="ddv2-' + index2 + '"></table></div>';
},
onExpandRow: function(index2,row2){
console.log("+++++++++++++++++++++");
console.log(index2+"==========="+row2);
var ddv2 = $(this).datagrid('getRowDetail',index2).find('#ddv2-'+index2);//严重注意喔
ddv2.datagrid({//?itemid='+row.itemid
//url:'./javascript/jquery-easyui-1.5.1/datagrid-detaildata.json?itemid='+row.itemid',
url:'json2detail.json',
fitColumns:true,
singleSelect:true,
rownumbers:false,
loadMsg:'',
height:'300px',
columns:[[
{field:'orderid',title:'Order ID',width:200},
{field:'quantity',title:'Quantity',width:100,align:'right'},
{field:'unitprice',title:'Unit Price',width:100,align:'right'},
{field:'op',title:'操作',width:100,align:'right',formatter:formatOper}
]], onResize:function(){
$('#dg').datagrid('fixDetailRowHeight',index2);
},
onLoadSuccess:function(){
$('#dg').datagrid("selectRow", index2)
setTimeout(function(){
$('#dg').datagrid('fixDetailRowHeight',index2);
},0);
}
});
$('#dg').datagrid('fixDetailRowHeight',index2);
ddv2.datagrid('fixDetailRowHeight',index2);
$('#dg').datagrid('fixDetailRowHeight',index);
}, onResize:function(){
$('#dg').datagrid('fixDetailRowHeight',index);
},
onLoadSuccess:function(){
$('#dg').datagrid("selectRow", index)
setTimeout(function(){
$('#dg').datagrid('fixDetailRowHeight',index);
},0);
}
});
$('#dg').datagrid('fixDetailRowHeight',index);
}
});
});
function formatOper(val,row,index){
return '<a href="#" onclick="editUser('+index+')">修改</a>';
}
function editUser(index){
alert("ddd");
}
</script> </body>
</html>
实现的效果如下（由于引用的css样式在浏览器没显示，效果如下图所示）：