在jqgrid中拖放行的树结构？

Question

我在表中使用jqgrid表示树结构。我提供了拖放行功能。我想在拖动事件上调用一个回调方法。因为我想调整行的层次结构是列其中有数字：1.1,1.2.1，......我可以这样做吗？ 以下是我在html中编写的代码：

jQuery(function(){
jQuery("#tree").tableDnD({scrollAmount:0}); 
jQuery("#tree").jqGrid({
url:'jsonSamplePots.json',
datatype: "json",
colNames: ["Task Id", "Task No.", "Task Name", "Priority", "Start Date", "End Date", "Task Type", "Link", "Link RelationShip", "Resources(Units)", "Reference"],

            colModel: [

                 {name:'id', index:'id', width: 30, hidden: true, key: true},
                {name:'no', width:80, sortable:false,editable:true},
                {name:'name', width:150, sortable:false,editable:true},
                {name:'priority', width:80, sortable:false,editable:true},
                {name:'sDate', width:80, sortable:false},
                {name:'eDate', width:80, sortable:false},
                {name:'type', width:120, sortable:false},
                {name:'link', width:80, sortable:false},
                {name:'rship', width:80, sortable:false},
                {name:'resources', width:300, sortable:false},
                {name:'ref', width:80, sortable:false},

            ],

rowNum:10,
rowList:[10,20,30],
pager: '#pcelltbl',
sortname: 'id',
viewrecords: true,
sortorder: "desc",
caption:"Tasks",
cellEdit:true,
treeGrid: true,

ExpandColumn:'name',
gridComplete: function() {
    //alert("gridcomplete");
    $("#_empty","#tree").addClass("nodrag nodrop");
    jQuery("#tree").tableDnDUpdate();
},    

我正在使用以下json数据：

{
"total": "1",
"page": "1",
"records": "2",
"rows": [
       {"id": "1", "cell":  ["1",  "Super <b>Item</b>",     "300", "0", "",  "false", "true", "true"]},
       {"id": "2", "cell":  ["2",  "<a href='http://www.google.com'>Google</a>", "100", "1", "1", "false", "false", "true"]},
       {"id": "3", "cell":  ["3",  "Sub Item 1",     "50",  "2", "2", "true",  "true",  "true"]},
       {"id": "4", "cell":  ["4",  "Sub Item 2",     "25",  "2", "2", "false", "false", "true"]},
       {"id": "5", "cell":  ["5",  "Sub-sub Item 1", "25",  "3", "4", "true",  "true",  "true"]},
       {"id": "6", "cell":  ["6",  "Sub Item 3",     "25",  "2", "2", "true",  "true",  "true"]},
       {"id": "7", "cell":  ["7",  "<span style='background-color:LightGreen; color:Tomato'>Item 2</span>", "200", "1", "1", "false", "true", "true"]},
       {"id": "8", "cell":  ["8",  "Sub Item 1",     "100", "2", "7", "false", "false", "true"]},
       {"id": "9", "cell":  ["9",  "Sub-sub Item 1", "50",  "3", "8", "true",  "true",  "true"]},
       {"id": "10", "cell": ["10", "Sub-sub Item 2", "50",  "3", "8", "true",  "true",  "true"]},
       {"id": "11", "cell": ["11", "Sub Item 2",     "100", "2", "7", "true",  "true",  "true"]}
]

}

提前致谢