ReSetting the grid data on LoadComplete - jqgrid

Question

I have a jqgrid and I want to reset the grid data when it is ready.I have a reason for doing this. My actual problem is complicated but here is a simple demo I created.
Here is a demo I created but the issue is that setting data on loadcomplete does not seem to show the data in the grid. The grid is just empty.
var mydata =
[
{id:"1", DocGroupName: "x", DocList: "y", Mandatory: "z"}
];
var mydata2 = [
{id:"2", DocGroupName: "yy", DocList: "rr", Mandatory: "gg"},
{id:"3", DocGroupName: "zz", DocList: "rr", Mandatory: "gg"}
];
$("#list").jqGrid({
datatype: "local",
data: mydata,
height: "auto",
colNames: ['id', 'Document Group Name','Document Name','No of Mandatory'],
colModel :[
{name:'id', index:'id', width:55},
{name:'DocGroupName', index:'DocGroupName', width:90, editable: true},
{name:'DocList', index:'DocList', width:90, editable: true },
{name:'Mandatory', index:'Mandatory', width:90, editable: true}
],
loadComplete: function(data)
{
$('#list').jqGrid('clearGridData').jqGrid('setGridParam', {
data: mydata
}).trigger('reloadGrid', [{ page: 1 }]);
},
pager: '#pager',
rowNum:10,
rowList:[10,20,30],
sortname: 'idcustomers',
sortorder: 'asc',
viewrecords: true,
gridview: true,
caption: 'Customers',
cellEdit: true,
cellsubmit: 'clientArray'
});