onPaging: function() {
    $(this).setGridParam({datatype: 'json'}).triggerHandler("reloadGrid");
},
loadComplete: function (data) {
    var $this = $(this);
    if ($this.jqGrid('getGridParam', 'datatype') === 'json') {
        // because one use repeatitems: false option and uses no
        // jsonmap in the colModel the setting of data parameter
        // is very easy. We can set data parameter to data.rows:
        $this.jqGrid('setGridParam', {
            datatype: 'local',
            data: data.rows,
            pageServer: data.page,
            recordsServer: data.records,
            lastpageServer: data.total
        });

        // because we changed the value of the data parameter
        // we need update internal _index parameter:
        this.refreshIndex();

        if ($this.jqGrid('getGridParam', 'sortname') !== '') {
            // we need reload grid only if we use sortname parameter,
            // but the server return unsorted data
            $this.triggerHandler('reloadGrid');
        }
    } else {
        $this.jqGrid('setGridParam', {
            page: $this.jqGrid('getGridParam', 'pageServer'),
            records: $this.jqGrid('getGridParam', 'recordsServer'),
            lastpage: $this.jqGrid('getGridParam', 'lastpageServer')
        });
        this.updatepager(false, true);
    }
}