jqGrid grouping feature disappear when run addRowData - jqgrid

Question

The jqGrid's website has following code example about how to use grouping feature, it works very well.
$(document).ready(function(){
var mydata = [
{id:"1",invdate:"2010-05-24",name:"test",note:"note",tax:"10.00",total:"2111.00"} ,
{id:"2",invdate:"2010-05-25",name:"test2",note:"note2",tax:"20.00",total:"320.00"},
....
];
$("#list48").jqGrid({
data: mydata,
datatype: "local",
height: 'auto',
rowNum: 30,
rowList: [10,20,30],
colNames:['Inv No','Date', 'Client', 'Amount','Tax','Total','Notes'],
colModel:[
{name:'id',index:'id', width:60, sorttype:"int"},
{name:'invdate',index:'invdate', width:90, sorttype:"date", formatter:"date"},
{name:'name',index:'name', width:100, editable:true},
{name:'amount',index:'amount', width:80, align:"right",sorttype:"float", formatter:"number", editable:true},
{name:'tax',index:'tax', width:80, align:"right",sorttype:"float", editable:true},
{name:'total',index:'total', width:80,align:"right",sorttype:"float"},
{name:'note',index:'note', width:150, sortable:false}
],
pager: "#plist48",
viewrecords: true,
sortname: 'name',
grouping:true,
groupingView : {
groupField : ['name'],
groupDataSorted:false,
groupColumnShow:[true]
},
caption: "Grouping Array Data"
});
But if I remove:
data: mydata,
And compose the grid by using addRowData:
$('#list48').addRowData("id", mydata);
The grouping disappeared, anybody experience similar issue ? Could you please help?
Thanks!

Answer 1

Try calling sortGrid after addRowData. That worked for me. Syntax for sortGrid is at http://www.trirand.com/jqgridwiki/doku.php?id=wiki:methods
var sortByColumnKey = 'StartDate';
$('#grid').jqGrid('sortGrid', sortByColumnKey, true);

Answer 2

I too had the same issue. Just triggering 'reloadGrid' solved it for me.
$('#grid').trigger('reloadGrid');

Answer 3

Grouping is not taken after adding rows on $('#list48').addRowData("id", mydata);
You should re-group with new data added in grid. Try this after adding rows to grid.
$('#list48').jqGrid('groupingGroupBy', 'name', {
groupDataSorted:false,
groupColumnShow:[true]
});